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Misfire after warm up

Tiny
WLBROOME
  • MEMBER
  • 1995 CHEVROLET CAMARO
  • 3.4L
  • V6
  • 2WD
  • AUTOMATIC
  • 109,112 MILES
Misfire after warm up. Runs great when cold. Has new engine new plugs wires injectors when starts misfiring can shut down start back up and runs fine until a few minutes then starts again.
Monday, April 10th, 2017 AT 11:34 AM

9 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,960 POSTS
This sounds like you have an intake valve that is leaking. Can you do a leak down test to confirm the issue?

This guide can help as well.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Please let us know what you find. We are interested to see what it is.

Cheers, Ken
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Monday, April 10th, 2017 AT 12:10 PM
Tiny
WLBROOME
  • MEMBER
  • 3 POSTS
No vacuum leaks. While driving you can shut off and restart and misfire goes away for a mile or so then comes back. Like I said runs great when cold. But fifteen to twenty minutes driving starts misfiring.
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Monday, April 10th, 2017 AT 12:48 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
This sounds like you have a stuck lifter holding the valve open. I would remove the valve cover and check the valve lash.
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Monday, April 10th, 2017 AT 3:04 PM
Tiny
WLBROOME
  • MEMBER
  • 3 POSTS
Fuel pressure is good. New crank sensor. 3x sensor replaced. Was told to disconnect 24x sensor and see if problem was still there. Was told if it did not misfire with disconnected to replace sensor. Still misfires. Have replaced PCM as well. So I did what you said and the intake lift cylinder #3 is tight. So I took the afternoon and replaced all lifters and the engine has never run better. Thanks for the help I love this site.
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Monday, April 10th, 2017 AT 3:30 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,960 POSTS
Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help.

Cheers, Ken
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Tuesday, April 11th, 2017 AT 9:45 AM
Tiny
BLEDION KORDALLI
  • MEMBER
  • 3 POSTS
I have the same problem like WLBROOME. Please help what can I do.
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Saturday, March 23rd, 2019 AT 7:18 AM
Tiny
BLEDION KORDALLI
  • MEMBER
  • 3 POSTS
I have replace crank sensor.
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Saturday, March 23rd, 2019 AT 7:30 AM
Tiny
BLEDION KORDALLI
  • MEMBER
  • 3 POSTS
Can camshaft sensor do this problem?
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Saturday, March 23rd, 2019 AT 7:31 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,960 POSTS
Not really can I ask if when you installed the new spark plugs if you used:
Spark Plug Type .................... AC R43TSK if not start here it must have these spark plugs. Here is a guided to help you install them correctly:

https://www.2carpros.com/articles/how-to-change-spark-plugs

Please run down this guide and report back.
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Saturday, March 23rd, 2019 AT 2:37 PM

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