Alternator causing rough running?
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Newbie
Joined: Sep 2006
Posts: 14
Alternator causing rough running?
97 Z28, Idles fine. Runs rough. Read codes: AIR malfunction (I removed AIR system so DUH!)
THe other code was, in effect: Alternator malfunction causing PCM problems. It charges between 13-14 volts by the guage. Anyone else had an alternator bad causing car to run like crap. P.S. New Platnium plugs and 8mm Taylor wires, cats gutted, seafoamed, throttle body cleaned.
THe other code was, in effect: Alternator malfunction causing PCM problems. It charges between 13-14 volts by the guage. Anyone else had an alternator bad causing car to run like crap. P.S. New Platnium plugs and 8mm Taylor wires, cats gutted, seafoamed, throttle body cleaned.
3rd Gear Member
Joined: Mar 2006
Posts: 925
From: Orange, Texas
RE: Alternator causing rough running?
need to put a voltmeter on it and find out for sure. thats a little low and if you get under voltage during high load operation it could cause all sorts of running problems. Sick
Tech Droid
Joined: Aug 2005
Posts: 9,215
From: North East PA
RE: Alternator causing rough running?
Low voltage will confuse the PCM and the engine, and sometimes the gages will act weird. A shorted alternator diode, generates a lot of electrical noise in addition to low voltage, further confusing the PCM, while a blown diode will only result in low voltage under load.
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