2000 Mustang Rough Idle No Codes

My 2006 LR3 just started having a rough idle and poor performance + check engine light. The Ford Mustang, with the 4. 8 144,000 miles. I have smoked it 10 times replaced check valves pvc coils changed vacuum lines I just cant figure it out. Engine rough idle problems arise because car engines are demanding. Focus dtc codes, 2000-2008. Also review what all the 2 and 3 digit codes are about. Turns out it was a vacuum leak at the intake manifold plenum. I had the following codes pop up, Air Intake Flor too Low, p307A TPS position, p00068 Throttle Position Correlation How can I fix this problem? I would really really appreciate a response. When I put the MAF & IAT from my Mountaineer in my Cougar I had zero issues and no codes. Rough Idle. It would idle fine on startup, but after getting warmed up, it would idle rough. Damage to the car's carburetor and vacuum hoses can cause the engine to misfire, resulting in a rough idle. Don't downvote a post or comment simply because you disagree with it or don't like it. We changed harmonic balancer but severe vibration still exists with car in park, neutral, reverse and drive. 4ish lambda and 2. PT Cruisers are stylish and popular wedge-shaped cars manufactured by Chrysler and inspired by the panel vans of the 1930's. 15 (O) No Keep Alive Memory power to PCM pin 1 or bad PCM (Memory Test Failure) (M). This company is not yet accredited. runs rough 2000 mustang 3. the toyota service department has performed the 60k mile service, which includes plugs, fuel injector cleaning and throttle body inspection. My son has a 2000 Mustang 3. Symptoms: runs extremely rough at idle, exhaust gases might as well be straight fuel dumping out (from the smell), will drive rough while cold but once warm will stall out while in drive or reverse. We have a complete list of Mustang DTC check engine codes located in one place! No more scouring the internet to find what that “service engine soon” code means. Next I'll test the secondary air pump. At that point, the "check engine soon" light came on. My 2006 LR3 just started having a rough idle and poor performance + check engine light. Have replaced air filter, fuel filter, spark plugs, spark plug wires. i heard stories about the iac. 4L engine has a rough idle and hesitation. If I apply a bit of gas in neutral and bring the RPM to 1000, the roughness is still present but is less pronounced. 1996+ Mustangs have an OBDII port that will allow certain handheld devices to plug into it and read what your check engine light means. Out of control range, IAC Tech 1 scan tool counts will be above 60 if idle is too low, and zero counts if idle is too high. The car amazingly has 190K on it and is still plenty strong. asked by Spencer N on October 12, 2016 When I use my car it idles at 700 and then stalls when used for 5 min but there are no check engine lights. Q: my 2001 3. What this series of articles is aimed at is how to fix the most common idle problems found in the Mustang. 0, stick shift high idle problems; poor performance; lacks power and acceleration '90 LX 5. Cylinder 6 Misfire Detected. The codes are listed seperately based upon fuel delivery type. Things I did: 1) Replaced the spark plugs with Champion 7989. Or 43 Three digit code 172 or 176 - O2 sensor indicates system lean. 1988 Notch Mustang: - 438W, direct port n2o, t56 2003 SVT Focus. Page 5 Got a problem you can't fix? Post here and one of our members will answer as soon as possible. Top 10 Causes of a Rough Idle | JL Motorworks. Page 2- running rough and surges at idle 5. It has almost 80k miles on it. So you probably see where the pattern is if I disconnect the battery I get the Engine idles rough and dies at idle issue so I'm thinking later today it may run fine again. I've also noticed that it wont happen after the idle can make it past the point where the idle settles (starts at round 1k and then drops to. it runs fine when i first start it, but soon idles low/rough, but only in gear. Code 91 is the driver side sensor, as viewed from the driver's seat. The truck is a 2000, 2wd, prerunner, v6 5speed. Acceleration is much improved but idle is still a little rough. memory codes Memory codes are problems that the computer has noticed in the past. The most recently reported issues are listed below. I didnt change the MAF like everyone suggested, and didnt need to. 0L from a 2000 Ford Explorer which features the GT40(P) cylinder heads and. Disconnect the car battery, remove the valve, clean, re-install valve, and drive the vehicle for about 5 minutes with the headlights and A/C ON to get the idle relearned. Components in the fuel, ignition, emission and other systems should work correctly. Clean air is crucial for your 2000 Ford Mustang’s performance and durability. If I remove the vacuum line from the charcoal canister to the sensor the idle smooths out and the truck runs fine. My 2006 LR3 just started having a rough idle and poor performance + check engine light. Unable to even drive it. OBIO3 Dodge Dakota JOIN HERE 1/12/2007 19:00:10: RE: Very rough idle when stopped IP. It is intended to help you map out a troubleshooting plan. it also seems the longer i sit the worst it gets. No codes showing(per my cheap bluetooth code scanner). It idles rough gets horrible gas mileage and no power. Also could I reset my ecu manually to see if it's a computer problem. Also the hissing which I. I'm wondering if anyone can help out with this engine issue I'm having with my 2000 Grand Vitara V6 2. The 600cfm carb is more than enough for a 302. Chevy Camaro runs rough and stutters asked by David W on January 29, 2017 My car idels rough and stutters when drivein im throwing a cam sensor condition code a o2 sensor bank1 sensor2 code I've replaced the plugs wires,purge value ,fuel filter,fuel pump and still stutters when drive and idles rough. 0L Truck runs fine above idle but stalls at idle? Rough idle can often be. runs rough 2000 mustang 3. Since I bought the car I have done the following: 1. 1500 revs at idle is way too high! Theres no reason it should be up that high unless thats at cold idle only. My mustang Eco boost has been falling below RPM's at stops and red lights. 2000 Mustang Automobile pdf manual download. No change in commanded idle speed would tell you there is a problem in the driver circuit, the wiring or the solenoid. 8L v6, runs rough especially when warm, doesn't want to idle, low power have to keep rpm's - Ford 2000 Mustang question Search Fixya Press enter to search. Rough idle indicates either a maintenance problem or a failed part. Research the 2000 Ford Mustang online at cars. What was strange was there was no Check Engine code. Idle Speed Control motor or Air Bypass not controlling idle properly (generally idle too high) (M) ISC sticking, open ITS circuit or TP sticking. The FITV is a mechanical valve that is controlled by coolant temperature (there is no ECU plug to it). Possible cylinder head or valve damage on the GM 2. asked by Spencer N on October 12, 2016 When I use my car it idles at 700 and then stalls when used for 5 min but there are no check engine lights. procedure for vehicles with mil on and 04-11-1 dtcs p0401, p0402, p1400 or p1401—additional symptoms may include runs rough, lacks power, surge, poor fuel economy ford: 2000-2002 taurus 2001-2002 crown victoria, focus, mustang 2001 explorer usps 2001-2002 e series, escape, expedition, explorer. still has rough idle. Q: my 2001 3. I've also noticed that it wont happen after the idle can make it past the point where the idle settles (starts at round 1k and then drops to. 4-liter Triton V8 engines. It is intended to help you map out a troubleshooting plan. 8 that is missing very badly and stalling at idle. 2000 dohc rough idle 8 Answers. It was idling real rough recently so I cleaned the throttle body out and changed out the idle control sensor. 0 stalls at idle and at speed; 95 mustang 5. runs rough 2000 mustang 3. Also I get dtc codes P1124 & P1126 which fuel enrichment level issue, which I guess is most often air leak somewhere, is that correct? Sometimes idles stalls so much that engine stops fully. The 2000 Ford Explorer has 4 problems reported for trouble starting and rough idle. After all of that my rough idle problem is not fixed but I forgot to check the resistance on the ICV. If for example there was a loose wire to a solenoid that only lost contact while driving but was making contact while testing the system there would be NO HARD FAULT CODE. or tps and cl 76mm acting goofy. Code shows misfire on #5 spark plug. It felt like it was stumbling, going down to almost stalling, then coming backat first it jerked forward a tad so I assume it surged upwards. In many instances, stalling ends up being an idle control motor at its limit or a failed motor. starts out fine but within in about 30-60 seconds from start when cold it starts to shake. The sound goes away after the car warms up. Then replaced a gas valve. Genuine Ford Part. Isuzu OBD2 codes; Jeep Powertrain P trouble codes. The wire harness rears it's ugly head when the wires are disturbed [ changing plug boots] Do a search on it. Anyway, when I started the car to go home this evening, it struggled to start and the idle was a bit rough. The most recently reported issues are listed below. net are the two best shop manuals—period! Unlike the cheaper Haynes and Chilton manuals that cover multiple year models, leaving the exact information you need to fix your car, these professional manuals cover your exact year, make, model. Rough Idle on cold start up (about 50% of the time), within minutes, it runs great. Also review what all the 2 and 3 digit codes are about. Since then, it has become worse, and now there is the additional symptom of a STRONG fuel odor. I also went to Auto Zone to get a Check Engine light diagnostic and received these codes: P0300 and P0401. I am having an issue with my 2000 mustang v6 3. Just recently that same rough idle if not worst is back. * VACUUM LEAK (High Idle) - If idle is too high, stop the engine. How To Read Your Mustang's DTC Codes. Things I did: 1) Replaced the spark plugs with Champion 7989. After doing a little research online I noticed that one of these are known for the intake (egr) possibly needing to be cleaned if you don't get the egr modification done from the Honda dealer. 8 because one of the valves got bent it set not running for about 5 years when i got it back together it 2000 mustang rough idle p0174 code - EricTheCarGuy - EricTheCarGuy- Stay Dirty!. Such symptoms have to be checked out, determining which vehicle components might. com trouble codes (dtc's) - service tips. 8L //// Engine Vehicle Shakes entire front end of car when at idle, all the way up to 2,000 rpms then it goes away. I went ahead and changed just the 1 cylinder spark plug and rough idle went away. I can give it throttle it reacts as it should and after a couple minutes of idling rough it'll come up to the 600-800rpm range. Refer to theof 3/30/2005 or later on Mustang and 4/18/2005. low idle, stalling at lights, white smoke from exhaust - P0171 Code. 8 rough idle The car still seems to idle very rough and car shakes at idle. He said that he re-flashed- the idle air control unit and I should go through certain motions to have my car re-learn its idle but so far nothing has worked. Top 10 Causes of a Rough Idle | JL Motorworks. No codes showing(per my cheap bluetooth code scanner). Engine is running fine. Code shows misfire on #5 spark plug. Input please when u have bigger injectors u dont want to lower the fuel pressurewith the 24's u should be around 44 psidid it just start to do this or did u change something and then it changed is the maf calibrated for the 24's? the tps voltage should be around. Symptoms: runs extremely rough at idle, exhaust gases might as well be straight fuel dumping out (from the smell), will drive rough while cold but once warm will stall out while in drive or reverse. 45 which is a little lower than recommended. No codes, no driveability issues, no stalling just this growling/gargling sounds from underneath and the fluctuating idle. Whether it is in gear or not has no bearing. Help, I'm at my wit's end with my 97 LX protege 1. If I apply a bit of gas in neutral and bring the RPM to 1000, the roughness is still present but is less pronounced. It's that common rough idle problem with the protege. It only takes a minor problem like a fouled spark plug to cause your engine to vibrate. If its running rough/ missing, and everything else is fine i think that indicates a vacuum leak. I'm having a similar problem, codes 22 tps sensor signal voltage low 33 map sensor signal out of range, high Are coming up but I've already changed out the map sensor and the tps seems to be working I disconnected it and idle went up to around 2 or 3 rpm and when I hooked it back up it went back down to a rough idle like its been doing. Hi, I noticed many helpful posts and would like to ask for some advice on my wife's 2000 Honda Civic VP 1. At that point, the "check engine soon" light came on. if you PB Blast it or some WD40 and scrape off the carbon it may fix your problem. Intermittent rough idle or no-start; no codes (96 850) Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine. 2000 dohc rough idle 8 Answers. 4-liter Triton V8 engines. After 3 to 4 minutes, failure is gone and truck runs as normal. 1500 revs at idle is way too high! Theres no reason it should be up that high unless thats at cold idle only. As to why the system could not recognize the misfire, I have no idea. Above 1000 RPM you cannot feel it anymore. Most of the time, though, the idle is noticeably rougher than before, but no clanking or ticking–just the noise of the vibration, which can be fairly loud if it’s idling for very long. My son has a 2000 Mustang 3. 2000-2002 Mazda 626. Replaced a couple parts (ecu, crank sensor, and ignition coil) car will start now and idle fine in park but once I put it in reverse or drive the rpms drop and the engine starts running bad. hi all, i am having rough idle problems with my 4. Then replaced a gas valve. The car is a petrol Ford Focus 2000 1. If I apply a bit of gas in neutral and bring the RPM to 1000, the roughness is still present but is less pronounced. Two dealers have told me there is nothing they can do - no stored codes. Out of control range, IAC Tech 1 scan tool counts will be above 60 if idle is too low, and zero counts if idle is too high. A few weeks ago (on 8/15 to be exact), I made a post about sputtering and rough idle. Rough Idle When Starting Cold, Then Goes Away When Engine Is At Operating Temperature More Details Below I have an older, low mileage vehicle with a V8 engine. Some of the most common problems reported by PT Cruiser owners are PT Cruiser idle problems—rough or bogged down idling—when the PT Cruiser comes to a complete stop or when the air condition is. Removing the plug on top of the transfer case was the very first mod I did to my truck and learned that from the original 80s list back in the early 90s. How do you fix a P0303 cylinder 3 misfire detected code on a 2000 Ford Mustang GT? Rough idle 1999 C280 codes P0300 and 0303? My 02 Mustang GT ended up having a bad exhaust valve that was. there is a significant hesitation at takeoff, and what felt like multiple misfires, and a noticeable loss of power while driving. When a Ford Focus exhibits problems with running roughly at idle speeds, auto mechanics generally look first to either a vacuum problem, or more often, a problem with water getting into the Differential Pressure Feedback Sensor (DPFE), a part of the EGR (exhaust gas recirculation system). Top 10 Causes of a Rough Idle | JL Motorworks. The wire harness rears it's ugly head when the wires are disturbed [ changing plug boots] Do a search on it. have the OEM manuals volume 1 & 2. Now I'm thinking vacuum leak, but after that I'm all out of ideas. Feels like its still misfiring. 1500 revs at idle is way too high! Theres no reason it should be up that high unless thats at cold idle only. The car pulls harder since cleaning the MAF at WOTwhy does it develop problems sitting at idle? It used to be very smooth before I cleaned stuff and changed the plugs. Recently, the car had been idling pretty rough, to the point that it would vibrate and stall at a stop sign or traffic light. No code was set, but she ran terribly, with no power, major misfires, and an occasional backfire. My car was having a rough idle when stopped at stop lights where the rpm would dip and you could feel the car rumble a bit. The first question is, can an exhaust leak cause a rough idle? When you have a rough idle situation and it's being attributed to an exhaust leak, it is more likely that the reason for a rough idle caused the exhaust leak. 5L, 312000KM. Had check engine light when I bought it. No codes, no driveability issues, no stalling just this growling/gargling sounds from underneath and the fluctuating idle. The car was well maintained by previous one owner using only Subaru dealers. I'm having a similar problem, codes 22 tps sensor signal voltage low 33 map sensor signal out of range, high Are coming up but I've already changed out the map sensor and the tps seems to be working I disconnected it and idle went up to around 2 or 3 rpm and when I hooked it back up it went back down to a rough idle like its been doing. Anyone who owns/drives one of these trucks is very likely to come across the dreaded P0171/P0174 service engine soon light. 2 had rough idle while parked up and down idle and stall when at light my codes came up mass air flow and cam sensor running lean on left bank i changed the sensors and nothing i took off the engin cowel and discovered i had a callaped hosethat ran to the pcv valve and i tear in it i replace the pcv valve and vacuum hoses and. i thought it, 2004 ford escape 138k miles p2195 p2197 - ford forums. The most recently reported issues are listed below. 8 that is missing very badly and stalling at idle. The truck is a 2000, 2wd, prerunner, v6 5speed. Need feedback. driveability—streamlined diagnostic article no. I have been chasing a rough idle on a 2002 Seville SLS. hope this helps you. Page 2- running rough and surges at idle 5. The Ford Mustang is an iconic American sports car that first debuted in 1964. Ford has issued a Technical Service Bulletin (TSB) for some units of the Ford F-150, Lincoln Mark LT, Ford Expedition, and Lincoln Navigator SUVs powered by 5. Learn how to find trouble codes on your fox Mustang from 1986 to 1993. 2 had rough idle while parked up and down idle and stall when at light my codes came up mass air flow and cam sensor running lean on left bank i changed the sensors and nothing i took off the engin cowel and discovered i had a callaped hosethat ran to the pcv valve and i tear in it i replace the pcv valve and vacuum hoses and. The car pulls harder since cleaning the MAF at WOTwhy does it develop problems sitting at idle? It used to be very smooth before I cleaned stuff and changed the plugs. My mustang Eco boost has been falling below RPM's at stops and red lights. kinda misses at idle. If for example there was a loose wire to a solenoid that only lost contact while driving but was making contact while testing the system there would be NO HARD FAULT CODE. Code 91 is the driver side sensor, as viewed from the driver's seat. Cleared codes, started truck and the P1316 code come back. Sometimes the Idle Air Control (IAC) may have carbon built up. There is alot of things this can be my truck did the same thing,btu this was when i put a new cam in it. I make mistakes all the time as do we all. So far, no codes exist so I don't even know where to start. Feels like its still misfiring. 8L v6, runs rough especially when warm, doesn't want to idle, low power have to keep rpm's - Ford 2000 Mustang question rough idle (code. 8L) rough idle solved, but have question Showing 1-10 of 10 messages. When the coolant is cold the valve is open and letting air into the IM through a hole in the TB before the throttle plate. txt) or read online for free. Read more Ford reviews to learn about other models. Had him install oem MAF sensor. damn dude, you need to fix that egr. info with full instructions and illustrations on how to repair this problem. After 3 to 4 minutes, failure is gone and truck runs as normal. I finally replaced the adjuster for one of the timing chains because there was too much slack in one of the chains causing the erratic idle. Genuine Ford Part. Since I bought the car I have done the following: 1. No lights on the dash. Fuel pressure at 36 psi, ignition system tests good, no codes se. Look at your harmonic balancer and check the rubber insulator. Rough idle, no power. Issue Some 2005-2010 Mustang vehicles built before 04/05/2009 and equipped with a 4. Learn more about the 2001 Ford Mustang. 0L Powerstroke with 151k miles that has had an on going occasional rough idle/low power condition. The car was well maintained by previous one owner using only Subaru dealers. The P1506 code means that the engine idle is out of factory specification. There is alot of things this can be my truck did the same thing,btu this was when i put a new cam in it. Finally solved it. The car is a petrol Ford Focus 2000 1. 2 engine 4 cylinder, recently my car's rpm has been stuttering when idle, even more when I have the A/C on, my accelleration is weak and delayed. well folks i have done and checked everthing that was mention to me and still have a rough idle (stumble). I'm about to tear all of my hair out. Any solutions would be greatly appreciated. Help, Advice, Owners' Discussion and DIY Tutorials on the Volvo S80 model. This is made worse when sitting in traffic and pulling away very lightly. After all of that my rough idle problem is not fixed but I forgot to check the resistance on the ICV. The codes are defined as to what system is affected. Rough Idle, lost of power and misfires At some point during the month of August the Roadfly forums are going to become archive only. had exhaust leak fixed and light went away. The P1506 code means that the engine idle is out of factory specification. No movement on the tach--I think the ECU will keep idle steady no matter what it takes--no CEL or other indication and it didn't threaten to stall, just noticeably rougher than usual. Damn my TB is slow to figure out what's wrong!! I was on my. 8 mustang runs rough. #2 plug wire caused a misfire, but my Ultragage showed wild spark advance ranges when it misfired. RE: Very rough idle when stopped IP: Logged Message: "Detori, I'm on my third dakota, the rough idle just comes with age. Sometimes it starts up with not its full power I dont know if that is involved with the issue also. What has me and the mechanics I've talked with is rough idle when cold and. It started about a week ago just here and there, now its running so rough you cant get much above 2k rpms. I've also noticed that it wont happen after the idle can make it past the point where the idle settles (starts at round 1k and then drops to. At that point, the "check engine soon" light came on. My car is Boxster 1997 and its running quite rough idle. We talked to several mechanics who said that the codes were saying the car was not. Besides the rough idle the truck has lost major power and when I do step on it, the intake noise is loud, like its not getting enough air. Thought it was a coil pack, EGR valve. I'm having a similar problem, codes 22 tps sensor signal voltage low 33 map sensor signal out of range, high Are coming up but I've already changed out the map sensor and the tps seems to be working I disconnected it and idle went up to around 2 or 3 rpm and when I hooked it back up it went back down to a rough idle like its been doing. Also for: Mustang gt 1999. I didnt change the MAF like everyone suggested, and didnt need to. Hi Everyone: This 2001 Hyundai Santa Fe with a 2. at times, the rpm's will fall to 0 and the engine dies. Revised 20-July-2017 to add note that the 94-95 uses a 4 wire O2 sensor. It's like having a new vehicle, but without the payments. So I checked under the hood and didn't notice anything wrong at all. No codes, no driveability issues, no stalling just this growling/gargling sounds from underneath and the fluctuating idle. Also for: Mustang gt 1999. Stumble? rough idle? no code misfire? I'm sitting there and all of a sudden the car starts to kind of shake, so I look down at the tach thinking it's stalling, however it wasn't. problem has been going on for a long time and we rough idle problems 4. 4ish lambda and 2. 1500 revs at idle is way too high! Theres no reason it should be up that high unless thats at cold idle only. While there are a variety of reasons your Ford Mustang GT has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil. This seems to be worst the colder it is outside. Finding the problem can be daunting, especially with so many sensors and switching valves involved. Also just for kicks, at idle the upstream o2 sensor gives me 1. Rough idle and misfiring, but no codes. Made to the original factory specifications from OEM quality materials, this Mustang Idle Air Control Valve with Motor is a direct fit OEM Ford replacement part that provides reliable maintenance-free operation. Replace the cranckshaft & camshaft sensors (myself) 3. I purchased a 2000 Subaru Legacy Sedan with automatic transmission and 121K for my daughter. It is not bad or even noticeable by most people, but in my opinion, it does not idle smooth like my 04 mustang. 8 144,000 miles. Portal » Board index » Mechanical and Maintenance (no chat or performance) » 2000-2005 (other than GXP) All times are UTC - 5 hours [ DST ] 2000 sle, rough idle - random misfire code. If I shut it off and turn it right back on cycle starts over again. ok so i did a valve job bank 1 on this 2000 mustang 3. Rough Idle, hesitation on acceleration, loss of power When I start the engine its starts up right away with no issues. and built between job #1 through 10. We talked to several mechanics who said that the codes were saying the car was not. Also please check out the statistics and reliability analysis of Ford Mustang based on all problems reported for the Mustang. when i put it in park or nuetral it idle up but it still lopes. Also for: Mustang gt 1999. Plenum is attatched to manifold and mounts up to the crossover housing. 1500 revs at idle is way too high! Theres no reason it should be up that high unless thats at cold idle only. Let me use an idle complaint that had me on the ropes as an example. Some of the most common problems reported by PT Cruiser owners are PT Cruiser idle problems—rough or bogged down idling—when the PT Cruiser comes to a complete stop or when the air condition is. Disconnect the car battery, remove the valve, clean, re-install valve, and drive the vehicle for about 5 minutes with the headlights and A/C ON to get the idle relearned. What is the idle set at? It seems like the idle was high before the PCM learned the trims then dropped down and you noticed it running rough. So I cleaned out the MAF, changed the fuel filter and ran some Seafoam through the gas. How do you fix a P0303 cylinder 3 misfire detected code on a 2000 Ford Mustang GT? Rough idle 1999 C280 codes P0300 and 0303? My 02 Mustang GT ended up having a bad exhaust valve that was. 2003 discovery, 85000 miles. Hello all, So I bought a 2000 mustang v6 3. My car rough idles and stalls, but no check engine light. I hate to approach a repair by throwing parts at the vehicle BUT there is no check engine light. It is intended to help you map out a troubleshooting plan. My 92 Dakota with 157K miles idles as smoothly as a new car. 3L Ranger or Mustang is a diagnostic plan. Turn the regulator knob clockwise to the recommended cleaning pressure (58 psi). Was running rough off and on. Ill take a shot at it. Engine is running fine. What do I need to check. 2001 F150 sometimes has rough idle & hesitates under light acceleration, but if you mash the pedal it runs fine. After all of that my rough idle problem is not fixed but I forgot to check the resistance on the ICV. I have a 03 ford focus with 180,000 miles on it, recently when I stop at a stoplight with it in gear it wants to idle rough and almost dies, I replaced the spark plugs, new fuel filter, new air filter, and that didn't help. Repairs so far $900…I still have the problem. I had a similar issue with an '02 XLT Escape with 170k. Since then, it has become worse, and now there is the additional symptom of a STRONG fuel odor. The thing is that my check engine light is not on and we have checked for pending codes which yields nothing. If for example there was a loose wire to a solenoid that only lost contact while driving but was making contact while testing the system there would be NO HARD FAULT CODE. As far as driving down the road, it was just fine and couldn't tell anything was wrong. Ford EEC-IV code retreival and diagnosis of Check Engine Light. 8t ATW 2000 GIAC chipped with a 50/50 blow off. could be your idle air control (IAC). Possible cylinder head or valve damage on the GM 2. coil pack, MAF sensor, crankshaft sensor, TPS sensor, IAC and checked for vacuum leaks. No codes showing(per my cheap bluetooth code scanner). A few weeks ago (on 8/15 to be exact), I made a post about sputtering and rough idle. It's like having a new vehicle, but without the payments. Engine Stalls (Check Engine Light May or May Not Be On). The intake manifold O-ring gaskets commonly leak, which creates a large vacuum leak.

2000 Mustang Rough Idle No Codes