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  #1  
Old 05-20-2006, 03:00 PM
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Engine runs on 3 cylinders after starting

Fella's,
When I fire up the engine, it seems to run on three (out of four ) cylinders. After 5-10 seconds, engines runs fine again.

Any idea what could be the cause? Temp sensor?

THANKS !!

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Old 05-20-2006, 10:59 PM
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With out knowing anything else about the car, my first guess is plugs

John Roncallo
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Old 05-22-2006, 12:22 AM
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I would guess leakdown on one injector, if the missing is rhythmic and not erratic. Pull plugs before startup and check for one cylinder with a gassy smell.

Steve
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Old 05-23-2006, 03:28 PM
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Quote:
Originally Posted by Roncallo
With out knowing anything else about the car, my first guess is plugs

John Roncallo
If it's a bad plug(s), shouldn't the engine run bad all the time??
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Old 05-23-2006, 03:42 PM
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Quote:
Originally Posted by sbourg
I would guess leakdown on one injector, if the missing is rhythmic and not erratic. Pull plugs before startup and check for one cylinder with a gassy smell.

Steve
The missing is indeed quite rythmic. It happens when the engine is both warm or cold, but always (so far at least ) disappears suddenly and completely after 10-15 seconds, and never returns for as long as the engine runs. Prob seems something electrical to me, and related to the start up procedure. Any more ideas??
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Old 06-14-2006, 09:47 PM
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Quote:
Originally Posted by Vronsky
If it's a bad plug(s), shouldn't the engine run bad all the time??
Nope. Only if they are really bad.

But heres a quick test. You say it runs good after about 10-15 sec. Give it a full throttle acceleration , preferably uphill on a highway, when it's warm and appears to be running good. That will stress the plugs to the max. If it misses under load thats usually plugs.

John Roncallo

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