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Engine miss, possible dirty injector/PCV valve leak

Tiny
MATT RICHMOND
  • MEMBER
  • 2001 CHEVROLET 1500
  • 4.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 113,000 MILES
Truck drives fine on normal conditions, however when I hit the interstate, or drive it up a hill and try to meet the speed limit. The truck doesn't want to reach higher rpm's, when I try, the check engine light begins to flash indicating a miss. The truck will bog down up hill, surge forward when it hits high rpm's, and will bog when ran over 70 mph for long periods of time. Put it on a computer it read cylinder 4 misfire, possible leak in PCV valve, or dirty injector.
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Monday, May 6th, 2019 AT 12:54 PM

1 Reply

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

This is a serious misfire and needs to dealt with immediately if the longevity of your vehicle's engine is of any concern to you. When your vehicle's Malfunction Indicator Lamp (MIL) or "check engine light" flashes, this is a Class A misfire and indicates that a Catalyst Damaging Event is taking place. A Class A misfire is when a misfire happens often enough during 200 engine revolutions that it will bring the temperature of the catalyst to 1800 degrees or greater. I suspect that you actually might have a clogged or partially clogged catalytic converter that is causing this. In the diagrams down below I have included a few links for you to go to below:

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms
https://www.2carpros.com/articles/how-to-test-a-catalytic-converter
https://www.2carpros.com/articles/catalytic-converter-replacement

Please go through these guides and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Monday, May 6th, 2019 AT 10:25 PM

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