Misfire

Tiny
2CARPROS CHRIS
  • ADMIN
  • 2012 CHEVROLET COLORADO
  • 2.9L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 33,000 MILES
I'm having a problem with my truck when it comes to a stop, it gives a nasty stutter as if it was a misfire but there is no check engine codes present what do I do?
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Monday, January 4th, 2016 AT 6:26 PM

4 Replies

Tiny
CARADIODOC
  • EXPERT
What you need then is a scanner with recording capabilities. When the problem occurs, you press the "record" button to record a few seconds of data, then you can play it back slowly later to see what changed. Since the data goes through the scanner's memory, the recording actually starts a few seconds before you pressed the button.

As a general rule, at least on older vehicles, the fuel supply system is not monitored, so with no fault codes, that's a good system to suspect. Spark / ignition problems are usually detected and will set fault codes. Valve timing problems are not intermittent. Sensor problems will be detected if they go out of a specific range, and that won't be limited to coming to a stop.

Another good suspect if your engine uses an EGR valve is a chip of carbon getting stuck in the valve. That will hold the valve open enough for exhaust gas to sneak in. There must never be any exhaust gas getting in at idle speed.
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Monday, January 4th, 2016 AT 6:37 PM
Tiny
WRENCHTECH
  • EXPERT
I had another Colorado that was doing that and it ended up needing a new electronic throttle body. It wasn't real expensive, a couple hundred bucks.
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Tuesday, January 5th, 2016 AT 2:12 AM
Tiny
2CARPROS CHRIS
  • ADMIN
Thank for the quick reply's guys. I will purchase a OB2 scanner to see if I can record the fault. Also I will pull the throttle body off and clean it with carb spray and an old shop towel. Inspecting the action of the butterfly if it is working properly. Maybe new spark plugs as well since it has over 130k on the odometer.
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Tuesday, January 5th, 2016 AT 9:03 AM
Tiny
WRENCHTECH
  • EXPERT
I tried cleaning the one I had and it didn't help. I had to replace it.
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Tuesday, January 5th, 2016 AT 9:27 AM

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