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Old 01-10-2010, 11:52 AM   #1
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Idle charging issues with stalling

I've been having some big trouble with my boosted zx3, I noticed my idle surges alot and comes to the brink of stalling, and often does in fact stall, when his surging is going on my lights dim with it's rhytm, out of curiousity i put my car in test mode and watched the voltage option, at regular idle my car is'nt charging, it's staying around 12 volts. With it being cold if i put my defroster radio headlights etc on at the same time the headunit will shut off or the call really surges. My question is, is my car stalling because it's not charging at idle, or is my car not charging at idle because the car is idling low and surging?


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Old 01-15-2010, 10:48 PM   #2
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It's surging because it's not charging. The fuel system expects to see charging voltage at idle, 14 volts or so. When it doesn't see 14 volts it tries to find out why by altering the idle, gets progressively lower and lower because fuel pressure is dropping. Eventually the car stalls out.

Check your battery connections, clean them even if they look good.
Check the 'alternator clip', make sure nothing is broken.
Test the battery and make sure it's good.
Test the alternator and make sure it's good.
Clean any grounds and make sure they are secure.
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