MY CAR MISFIRE'S AT LOW RPM AND ONLY IN THE MORNING OR WHEN THE CAR IS VERY COLD, WHAT CAN IT BE?

1992 Opel Monza

Tiny

Archie888

April, 26, 2012 AT 5:05 AM

It's a 2 liter 8 valve, I've changed the plugs, the fuel filter and the coldstart idle valve.

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7 Answers

Tiny

mikederouin88

April, 26, 2012 AT 5:19 AM

It could be as simple as water in your gas

Tiny

Archie888

April, 26, 2012 AT 5:27 AM

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?

Tiny

fixitmr

April, 26, 2012 AT 5:34 AM

What do you mean by misfire? Engine shakes more than usual?

Tiny

Archie888

April, 26, 2012 AT 5:43 AM

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.

Tiny

fixitmr

April, 26, 2012 AT 5:48 AM

Check replace ECM temp sensor.

Tiny

mikederouin88

April, 26, 2012 AT 1:00 PM

Possibly an ignition control module failing on the low RPM side u can test that at a local parts house

Tiny

fixitmr

April, 26, 2012 AT 1:28 PM

Wow, is it really 344k miles? Engine could just be too worn out maybe a compression test is in order?

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