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Old 02-09-2013, 09:53 PM   #1
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Join Date: Oct 2011
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Location: mtl, Canada
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bad alternator causing rough idle ?

Hi everyone !
I have a bad alternator and/or voltage regulator that i've identified with the in-dash test mode ( voltage was under 12 v till 2500 rpm ). I'm also having a rough idle : motor shakes and listening to the exhaust gave me impression of an engine misfire (airflow isnt steady at the tail pipe like pof-pof-pof-pof... ). My question is : since voltage at idle is slightly under 11v , could this lead to an engine misfire ? Like if the coilpack would not have enough ''juice'' to make a good spark ?


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