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01 rough idle at start but goes away....

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Old 07-02-2012, 12:18 AM
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Default 01 rough idle at start but goes away....

so my 01 has a rough idle, almost a miss when i first start it and if i go drive it around it will go away, and not come back untill i leave it and try starting it again once its cold,

i've maybe driven it 3 times in the past 6 months, did a fresh oil change(noticed a bit of sludge) ran some seafoam, changed again, still nothing...


any suggestions?
 
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Old 07-02-2012, 05:21 AM
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my 99 did the same thing check your throttle body right where the valve is to let air in. it could be built up with carbon so the valve is having a little trouble opening and closing. i cleaned it and the problem seemed to go away
 
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Old 07-02-2012, 09:07 AM
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Try a new cap and rotor, it could be corroded or shorted out in the cap from not being run so much. I almost guarantee this is the problem
 
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Old 07-02-2012, 09:45 AM
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thanks for the fast replys, I'm going to check out both of those this morning.

Would the cap/rotor start working fine tho after it warms up? thats what doesnt make sense to me,
 
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Old 07-02-2012, 01:43 PM
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Hard starting and rough idle in damp conditions is a classic sign of a bad cap and rotor. If it has been really humid where you live that can do it.
 
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Old 07-02-2012, 01:49 PM
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Yes, I have seen it numerous times... the cap shorts itself out within the plastic causing a misfire that can barely be heard but does throw a code usually and cant be heard with the rpms high. replace them with ac/ delco parts ONLY if you have the cash to.
 
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