Focus Fanatics - View Single Post - bad alternator causing rough idle ?
View Single Post
Old 02-09-2013, 09:53 PM   #1
beatmaniac1
Focus Enthusiast
 
beatmaniac1's Avatar
 
Join Date: Oct 2011
Fan#: 90996
Location: mtl, Canada
What I Drive: 2003 red svtf

Posts: 111
FF Reputation: 2 beatmaniac1 Good Standing Member
Buy-Sell-Trade Rating: (4)
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 ?

Thanks
Ray


beatmaniac1 is offline  
    Reply With Quote