mis fire when cold start

s300 and SManager software questions & answers
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tboostdsi
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mis fire when cold start

Post by tboostdsi » Tue Feb 07, 2006 9:34 am

i have s300 and at cold start only i can hear the sound of a misfire and small pop in the exhaust almost like a back fire but very mild. once the car is heated up there is no more misfire....any suggestions. do you think my timing is off on the crank from what it is on my s300 ignition tables?
any thought would be helpful, thanks. tommy

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Spunkster
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Post by Spunkster » Tue Feb 07, 2006 10:11 am

That or the air fuel is incorrect when it is cold.

tboostdsi
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Post by tboostdsi » Tue Feb 07, 2006 1:31 pm

air fuel reads 13.5 or so and 14.7 to 15.5 . idle jumps up and down when cold start. idle is very lumpy. once car is warmed up a/f stays at 14.7 . thansk again for the help.

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Spunkster
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Post by Spunkster » Tue Feb 07, 2006 3:26 pm

sounds like you have found the problem then

tboostdsi
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Post by tboostdsi » Thu Feb 09, 2006 8:30 am

yes, but thought i would ask the experts......what should my af be when engine is cold at idle.

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Post by Spunkster » Thu Feb 09, 2006 10:33 am

mid to high 12's then lean out as it gets warmer until it gets to operating temp at 14.7

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