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My car misfire's at low RPM and only in the Morning or when the car is very cold, what can it be?

Tiny
ARCHIE888
  • MEMBER
  • 1992 OPEL MONZA
  • 344,000 MILES
It's a 2 liter 8 valve, I've changed the plugs, the fuel filter and the coldstart idle valve.
Thursday, April 26th, 2012 AT 5:05 AM

7 Replies

Tiny
MIKEDEROUIN88
  • MEMBER
  • 137 POSTS
It could be as simple as water in your gas
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Thursday, April 26th, 2012 AT 5:19 AM
Tiny
ARCHIE888
  • MEMBER
  • 3 POSTS
But only when its cold and on low rpm, from 2000rpm and up it revs clean and idles right and when its temp starts picking up the misfire is gone?
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Thursday, April 26th, 2012 AT 5:27 AM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
What do you mean by misfire? Engine shakes more than usual?
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Thursday, April 26th, 2012 AT 5:34 AM
Tiny
ARCHIE888
  • MEMBER
  • 3 POSTS
The engine doesn't rev clean, it struggles to rev up til it hits 2000rpm and then it revs clean. Basically the engine runs un even and not properly.
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+1
Thursday, April 26th, 2012 AT 5:43 AM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Check replace ECM temp sensor.
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Thursday, April 26th, 2012 AT 5:48 AM
Tiny
MIKEDEROUIN88
  • MEMBER
  • 137 POSTS
Possibly an ignition control module failing on the low RPM side u can test that at a local parts house
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Thursday, April 26th, 2012 AT 1:00 PM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Wow, is it really 344k miles? Engine could just be too worn out maybe a compression test is in order?
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Thursday, April 26th, 2012 AT 1:28 PM

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