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Old 07-24-2011, 09:44 PM   #1
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Cold start...stalling and backfiring

On a cold start my jeep starts idling kind of low and when I start driving it stalls and backfires for about a quarter mile then it starts running fine...could this be bcuz there is a KnN breather on it and the connecter from the original breather is not connected. So on a cold start it doesn't no what to do.? Please help...

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Old 07-25-2011, 08:04 AM   #2
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the short answer would be NO. a little more info would be nice but here it goes anyways. When you start your jeep it is in "open loop" mode which means that the computer is reading a preprogrammed map. it does not adjust the fuel mixture on it own until the O2 sensor comes up to temp. this is a timed parameter. I think it is about a minute after start. If you start the jeep and let it idle for a minute then start driving, does it still do it?

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Old 07-25-2011, 08:16 PM   #3
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Thanks for responding....Its a 99 Sahara 6 cyl....with 149,000 miles on it....It takes about a min after cranking before it starts idling low..if I bump the gas it seems to idle normal....Today I let it worm up for four minutes...it went through its low idle deal ,i did not touch the gas it came out of the low idling and after bout four minutes I started driving and No...it did not stall or backfire...and the jeep had been setting for four hours...i have changed the coolant temp sensor and cleaned the throttle body, new plugs and wires.....thanks alot for any info..
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