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Engine run issues after clutch replacement

Tiny
SBURTON55
  • MEMBER
  • 2008 FORD MUSTANG
  • 4.0L
  • 6 CYL
  • 2WD
  • MANUAL
  • 240,000 MILES
1st time clutch replacement on my 08 mustang v6. Car was running flawlessly before repair. After repair engine runs rough, exhaust smells like rotten eggs, sometimes black smoke from too rich mixture. Idle rpm varies, engine sometimes stalls. Check engine light on. When code reader used, obd2 reporting error code for virtually every sensor. Map, pcv, upstream/downstream o2, egr. All told appx 10 sensor error codes, and one very confusing one. Seems to indicate incomplete diagnostic read of obd2. After code clear, it takes a couple of minutes for check engine light to come back on. Have no idea what has happened. Have cleared error codes to see what repeats. One time had "wrench" light come on. Owners manual says this is for thottle sys error? Wrench light went off after engine restart and has not appeared again. Has my ecu fried? Does dealer need to reprogram back to default specs? I have not driven car other than move from driveway to back yard. Any advice you might have would be appreciated. Car has been towed to my mechanic, he doesnt understand why so many error codes are being reported either.
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Tuesday, December 1st, 2015 AT 10:22 PM

8 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check battery and connections first cold be corrosion on either end. Then check for vacuum leaks like a hose off etc. Finally scan for codes and check fuel pressure with a gauge give us pressure and codes. A bad battery will give multiple codes all wrong.
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Wednesday, December 2nd, 2015 AT 6:57 AM
Tiny
SBURTON55
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  • 5 POSTS
Thanks, will give it a try
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Wednesday, December 2nd, 2015 AT 7:48 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
I forgot have auto parts/tire store/garage check for condition of battery including load test.
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Wednesday, December 2nd, 2015 AT 7:55 AM
Tiny
SBURTON55
  • MEMBER
  • 5 POSTS
Thanks. Battery tested ok, and connections were checked, seemed to be in good clean condition. Reset computer using method found several places on internet: battery disconnect for 60 min, start car w/ all accessories off and idle for 10 mins, then shut down. Restart car with all accessories on, idle for 10 min and turn off.

Check engine light is now off, but 'wrench' light is on continually. From other info on internet, 'wrench' indicates throttle body issue. 1st solution is to clean TB. If problem not solved, guess I will have to take to dealer for trouble shooting. Even though Check Engine light is off, now have 3 error codes instead of over a dozen. 2 codes for o2 sensors, and 1 code for PCV. Info available thru other internet forums seem to indicate TB issues where wrench light is on, may cause codes w/o check engine light appearing. Does it seem we are heading in the right direction?

Other info also indicates the throttle system needs to be manipulated for the computer to 'relearn' throttle position once TB is removed and re-installed or replaced. How would I do this? Similar somehow to computer reset?

Thanks!
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Wednesday, December 2nd, 2015 AT 1:12 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Any garage with a scanner can find the code or problem if you don't want to go to a dealer. It needs to be a good scanner though not one from auto parts.
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Wednesday, December 2nd, 2015 AT 3:17 PM
Tiny
SBURTON55
  • MEMBER
  • 5 POSTS
Problem mostly fixed. Cleaned TB. Wrench light off and car runs smoother than before. Better throttle response, and appears better gas mileage. Only remaining is check engine light is now on, code reader indicates bank 2 o2 sensor issue. Mechanic feels that this may be error due to computer reset as car is "learning" things again and may go away after enough full drive cycles are completed. Check engine light behaves like this: codes are cleared, and engine is run w/o check engine light appearing - no codes reporting after drive around block and engine running while checking for codes. After shut down, turn on key to 'run' position, all lights on dash go out except check engine light, and code reads bank 2 o2 sensor error with engine started, but also reports diagnostic check incomplete. Will touch back here after a couple of days of normal use and see what happens.
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Thursday, December 3rd, 2015 AT 8:27 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check the fuel pressure and O2 connection or if there is a fuse for O2 sensor.
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Thursday, December 3rd, 2015 AT 9:25 AM
Tiny
SBURTON55
  • MEMBER
  • 5 POSTS
Ok, for those interested, problem update. Christmas morning was getting ready to leave home and deliver some christmas presents to friends. Started car, began to reverse, and almost immediately car lost power and went into limp home mode (wrench light on again). Tried all previous steps noted in earlier posts to no avail. So. Monday, had car towed to local Ford dealer. Root cause of problem was identified. When clutch was changed, main ecu wire harness got pinched between trans bell housing and rear of engine block. Resulting damage to wire harness caused myriad error codes due to intermittent signal interrupts. (Wire shorts). Dealer was frankly amazed car still ran at all. Fortunately none of the computer systems were damaged. Cost of repair at dealer $750. Talked to shop that caused damage when clutch was replaced and told them about all of this. Hopefully they will own up to error, and reimburse cost of repair.
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Wednesday, December 30th, 2015 AT 9:01 PM

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