Bunch of issues: Can't communicate with PCM, no spark, no injector pulse
01-10-2012, 03:31 PM
#1
Bunch of issues: Can't communicate with PCM, no spark, no injector pulse Out of left field today the engine cut out on me while driving. Had to tow it to the shop. SES light went on. Before this happened it did cut out on me real quick while driving 3 times but caught itself and still ran.
Can't seem to communicate with the PCM via the dash port. Don't know if Brian over at Kaltech tuning had his program cut communication off with the port. Don't know if this is the norm or not.
Basic diagnosis we have is no injector pulse and no spark. It does run after 20 seconds of cranking. But before today it usually started right up with the turn of the key.
This is all I have to work with right now. Hoping it's not the opti.
Thoughts? Thanx
Can't seem to communicate with the PCM via the dash port. Don't know if Brian over at Kaltech tuning had his program cut communication off with the port. Don't know if this is the norm or not.
Basic diagnosis we have is no injector pulse and no spark. It does run after 20 seconds of cranking. But before today it usually started right up with the turn of the key.
This is all I have to work with right now. Hoping it's not the opti.
Thoughts? Thanx
01-10-2012, 04:03 PM
#4
Just out of curiosity, does the PCM communicate with the abs and the air bag sensor? The lights on the dashboard have been on for those one too many times.
Would a bad ground to the PCM trigger all of this including communication cutoff?
Would a bad ground to the PCM trigger all of this including communication cutoff?
Last edited by Rob94hawk; 01-10-2012 at 04:11 PM.
01-10-2012, 04:36 PM
#5
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I bet the coil pack is bad. Use the diag on shoebox web site. Same thing happen to me when I added the turbo. Went to start and no spark or injector pulse. Sometimes it would start but most of the time nothing. Check the easy stuff first. Fuses, ect.
01-11-2012, 08:40 AM
#7
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Probably a dumb question, but if your PCM is OBDI are you scanning with OBDI cable and not OBDII?
Secondly, have you checked to make sure both posts on the power distribution block in the pass. side are tight?
Secondly, have you checked to make sure both posts on the power distribution block in the pass. side are tight?
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01-11-2012, 08:51 AM
#8
Will check the power again.
Does the cigarette lighter power the scan port?
Edit: there's power to the lighter and no fuses are blown. Gonna let the guys at the shop dig deeper. Don't know my *** from my elbow with wiring. Checking fuses and plugging **** in is about as far as I go. I'm bettin this aint gonna be pretty.
Anyone have a good link to a new AC Delco optispark if it comes down to it?
Last edited by Rob94hawk; 01-11-2012 at 09:20 AM.
01-11-2012, 09:23 AM
#9
I already asked him that. He told me that his scanner does both OBD I and II.
Will check the power again.
Does the cigarette lighter power the scan port?
Edit: there's power to the lighter and no fuses are blown. Gonna let the guys at the shop dig deeper. Don't know my *** from my elbow with wiring. Checking fuses and plugging **** in is about as far as I go. I'm bettin this aint gonna be pretty.
Anyone have a good link to a new AC Delco optispark if it comes down to it?
Will check the power again.
Does the cigarette lighter power the scan port?
Edit: there's power to the lighter and no fuses are blown. Gonna let the guys at the shop dig deeper. Don't know my *** from my elbow with wiring. Checking fuses and plugging **** in is about as far as I go. I'm bettin this aint gonna be pretty.
Anyone have a good link to a new AC Delco optispark if it comes down to it?
01-13-2012, 12:33 PM
#19
An MSD Opti is no better lol... do a search and see what you find on them.
IMO you could have got a dud like a lot of us get but wasting even more cash on something thats just as if not worse for reliability is a no no! Pick up a new Delco from Summit and give it a shot. Thats what i would do if i was in your position. Shame if you could to wait till spring as ill have a nearly new 5k old delco opti and msd cap n rotor kit with maybe 2-3 k since i put the motor in. Im going to let all my stuff go up cheap once i get to pulling the motor apart for the EFI 24x swap come spring.
IMO you could have got a dud like a lot of us get but wasting even more cash on something thats just as if not worse for reliability is a no no! Pick up a new Delco from Summit and give it a shot. Thats what i would do if i was in your position. Shame if you could to wait till spring as ill have a nearly new 5k old delco opti and msd cap n rotor kit with maybe 2-3 k since i put the motor in. Im going to let all my stuff go up cheap once i get to pulling the motor apart for the EFI 24x swap come spring.
