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Running very rough

Tiny
ONEGOODWOP
  • MEMBER
  • 1994 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 176,000 MILES
Idles rough runs rough at low rpm's and less rough at higher rpm's. Lots of carbon blowing out exhaust pipe and fuel dumping out of injectors. I have changed rotor, cap, plugs and mass airflow sensor. Used my code reader (blinking service engine soon light) and got code 22 and 54. Just had a new catalytic converter and muffler installed after being tested and found to be all plugged up.
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Monday, August 14th, 2017 AT 3:59 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,785 POSTS
Hello,

It sounds like the ECM is bad. Here is the location so you can swap it out with a used one you can get pretty cheap.

Please let us know what happens.

Cheers, Ken
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Wednesday, August 16th, 2017 AT 1:24 PM
Tiny
ONEGOODWOP
  • MEMBER
  • 3 POSTS
Thank you for the reply Ken. I was told by a shop after they did a compression check I have a bad cylinder or even a bent lifter. They were going to remove valve cover to determine.
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Saturday, August 19th, 2017 AT 9:49 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,785 POSTS
Please let us know what happens.

Cheers, Ken
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Saturday, August 19th, 2017 AT 10:59 AM

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