2008 ForTwo engine miss but check engine OFF - Smart Car Forums
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post #1 of 6 (permalink) Old 08-22-2019, 12:50 PM Thread Starter
 
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2008 ForTwo engine miss but check engine OFF

My '08 Cabrio with 90K+ miles seems to have an engine miss when under load but the check engine light has not come on. Have relied on a diagnostic code in the past, pointing me to a cylinder. Haven't tried to read a code yet, assume one isn't there. Anyone else had an obvious miss that didn't illuminate the check engine lamp? Ready to try a replacement coil or plug or plugwire, but would rather not be guessing, definitely don't want to trouble a dealer to charge me $300 for a diagnostic. Please share any thoughts, thanks in advance.
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post #2 of 6 (permalink) Old 08-22-2019, 12:55 PM Thread Starter
 
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Car starts instantly, idles fine. Oil is fresh. Transmission can't find reverse half the time, irrelevant. Lighter throttle I think is fine, heavier throttle produces miss. Will go check for codes anyway....
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post #3 of 6 (permalink) Old 08-22-2019, 01:07 PM
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Are you running 91 octane or better? Tried swapping coils?
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post #4 of 6 (permalink) Old 08-22-2019, 02:19 PM Thread Starter
 
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Surprise, got a P0303, even though the check engine lamp was off. Cleared the code, drove around short block, codes are still clear, will keep an eye on it. P0303 maps to a cylinder #3 misfire, correct? Is cylinder #3 driver-side or passenger-side of engine?

BTW, using good fuel, haven't tried seafoam, haven't pulled plugs. Had a P0303 long ago, I think the coil-over thing was cracked, replaced with slightly used one, fixed it for 50K miles ago. Will explore a little deeper, thanks again.
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post #5 of 6 (permalink) Old 08-22-2019, 03:12 PM
 
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Originally Posted by den458 View Post
Surprise, got a P0303, even though the check engine lamp was off. Cleared the code, drove around short block, codes are still clear, will keep an eye on it. P0303 maps to a cylinder #3 misfire, correct? Is cylinder #3 driver-side or passenger-side of engine?

BTW, using good fuel, haven't tried seafoam, haven't pulled plugs. Had a P0303 long ago, I think the coil-over thing was cracked, replaced with slightly used one, fixed it for 50K miles ago. Will explore a little deeper, thanks again.
A P0303 doesn't necessarily mean cylinder 3. I just went through that with my car after changing an engine, in the end it was cylinder 1 not firing at all cause I forgot to hook up the fuel enjector!
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post #6 of 6 (permalink) Old 08-22-2019, 09:31 PM
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My 2012 used to misfire in cold weather since it was brand new. Never triggered a CEL for it until after 50k miles. During warranty, the dealerships said they wouldn't even investigate without a CEL.

Seems the misfire has to be pretty heavy to illuminate the CEL.
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