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Been having some issues with random engine misfire and #3 cylinder misfire. Sometimes you can idle at a red light and the check engine light will come on and flash, the car will have a dead miss in it. You can restart the car and it will run fine(light stays on). You can drive it a few days with sea foam in it and the light will go out.(or reset it) This seems to do this when idling. Never will act up when you are actually going down the road. This has been going on a while. Been doing the seafoam about every third tank. Anyone have any thoughts. 2011 smart 54,000 miles
 

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And plugs were replaced at 30k?

Feeding it a $10 bottle of Seafoam and continuing to drive with a "CHECK" Engine Light is playing smart engine Roulette . . . :blowingup:

May want to get a proper diagnosis from your nearest $mart Center or "trusted" Euro mechanic sooner rather than later?
 

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Discussion Starter #3
yep plugs were replaced, this actually started around 30,000 miles. Sea foam usually fixes it. Carbon was original thought?
 

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Have you tried getting gas from a different top tier station for a few tanks? Multiple cylinder misfires would seem to indicate a possible fuel problem. The fact that SeaFoam helps but the problem comes back might also indicate a fuel problem (treating the symptom, but not the problem).
 

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I'm with DNA - the car is trying to tell you something and all the additive treatments will just prolong the inevitable. :wink:
 

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Sounds like you needed a valve adjustment .....or valves

As compression drops, an engine will drop cylinders with the lowest compression at idle. At more rpms it wakes up. I bet you have an exhaust valve tightening up. Normally a fuel problem is worse at rpms not idle where barely any fuel is burned.
 

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Normally a fuel problem is worse at rpms not idle where barely any fuel is burned.
I could see that - may need to look further into the engine than just fuel. Still not sure how an additive could temporarily "fix" a mechanical issue though. But, I'm no mechanic for sure...
 

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Discussion Starter #9
Been having some issues with random engine misfire and #3 cylinder misfire. Sometimes you can idle at a red light and the check engine light will come on and flash, the car will have a dead miss in it. You can restart the car and it will run fine(light stays on). You can drive it a few days with sea foam in it and the light will go out.(or reset it) This seems to do this when idling. Never will act up when you are actually going down the road. This has been going on a while. Been doing the seafoam about every third tank. Anyone have any thoughts. 2011 smart 54,000 miles

Been running around town (stop and go) for about 80 miles and no CEL. Had defrost on to let engine better. Anyone know how raise the idle speed?



Sent from AutoGuide.com App
 

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Been running around town (stop and go) for about 80 miles and no CEL. Had defrost on to let engine better. Anyone know how raise the idle speed?

Sent from AutoGuide.com App
Sealed system - no carburetor idle screw adjustment since it is computer driven fuel injection.

Running defrost will increase idle speed as the A/C compressor is engaged . . .

Sounds like Seafoam is your friend until the engine hand grenades? :blowingup:
 

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You might be getting water in your fuel. This can even happen in Kalifornia (yes, it does occasionally rain here). Seafoam or drygas fuel additive will absorb the water and allow it to pass through without stalling your engine. The water will usually will puddle in one of the 3 injectors.
 
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