mystery problem with my mustang please help techs
06-27-2007, 05:48 PM
#21
corner carver
Join Date: Oct 2006
Location: New England
Posts: 4,371
RE: mystery problem with my mustang please help techs
ORIGINAL: Brute03
well 90% of the time it's usually the alt. that causes a false cps code. i'm curious to know how a coil killed your computer though
well 90% of the time it's usually the alt. that causes a false cps code. i'm curious to know how a coil killed your computer though
06-27-2007, 09:15 PM
#22
2nd Gear Member
Join Date: Feb 2007
Location:
Posts: 398
RE: mystery problem with my mustang please help techs
Added resistance in circuits will fry other electronics. I had a bad spark plug wire on my 93 and it killed the coil, pickup, ECU, and the sensor on the front of the distributer (can't remember what the hell it is called)....
06-29-2007, 12:40 AM
#24
4th Gear Member
Join Date: Jul 2006
Location: N. Ft. Myers, Fl
Posts: 1,329
RE: mystery problem with my mustang please help techs
ORIGINAL: Brute03
i got your pm
the problem is with the alternator. something internally, a diode i think goesbad in the alt. which causes it to electro-magnetically intereferewith the cps......especially since they are both on the same harness( and the cps is a halls effect [magnetic] sensor), so now the pcm thinksthat the cps is out of whack, hence the p0340 code
the carbackfires on start up because the pcm doesn't know where the camshaft is so now the injectors are out of sync which is why it would appear to be a timing issue at first glance. believe me, this code gave me hell to figure out since the mechanics weren't much help, one guy even laughed when i told him i wasgoing toput a new alternator in
i got your pm
the problem is with the alternator. something internally, a diode i think goesbad in the alt. which causes it to electro-magnetically intereferewith the cps......especially since they are both on the same harness( and the cps is a halls effect [magnetic] sensor), so now the pcm thinksthat the cps is out of whack, hence the p0340 code
the carbackfires on start up because the pcm doesn't know where the camshaft is so now the injectors are out of sync which is why it would appear to be a timing issue at first glance. believe me, this code gave me hell to figure out since the mechanics weren't much help, one guy even laughed when i told him i wasgoing toput a new alternator in
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