PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Cranks With no Fire

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Old Mar 30, 2009 | 10:56 PM
  #21  
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Originally Posted by jay_lt4
lol your funny,,, you can use a test light to check for power at the injectors, the power circuit does not go through the pcm,, it comes from the fuse block straight to the injectors

the pcm controls the ground circuit and i wouldnt recomend a test light on that circuit, but for the power circuit your fine

now if said to check for injector pulse id tell ya to use a noid light
That is why I said PCM circuit. I don't want to see people using a test light for something they shouldn't.


btw, they have power.
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Old Mar 31, 2009 | 12:55 PM
  #22  
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Sounds like a possible VATS issue. Turn the VATS off and reflash it. If that works you will need to relink your VATS if you want it on.

The GTO computer probably wont work. You will have the VATS issue as well as a crank postion signal problem. I believe the 04 GTOs have the later model reluctor wheel on the crank.

Last edited by VortecHOjunkie; Mar 31, 2009 at 01:06 PM.
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Old Mar 31, 2009 | 05:13 PM
  #23  
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Originally Posted by VortecHOjunkie
Sounds like a possible VATS issue. Turn the VATS off and reflash it. If that works you will need to relink your VATS if you want it on.

The GTO computer probably wont work. You will have the VATS issue as well as a crank postion signal problem. I believe the 04 GTOs have the later model reluctor wheel on the crank.
If it was a VATS issue would it even crank?
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Old Apr 1, 2009 | 11:24 AM
  #24  
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Originally Posted by Grn4fbody
I don't have a DOM or a volt meter, all I have is a test light.


If my PCM is bad, can I use any 99-02 Fbody PCM's?

Tonight I'm gonna try to unplug my buddy's 04 GTO PCM and plug mine in and see if his car fires with my PCM....I'd really like to try this on a Fbody but I wasnt sure if I can do this on anything besides an 02 M6 car?
I don't think the 04 gto cpu's have the same pin out's as the 99-02 camaro computers
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Old Apr 1, 2009 | 11:31 AM
  #25  
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the GTO will use a green/blue pcm, not a red/blue pcm, the pinout is probably close, but the keys in the wire harness will prevent you from connecting the green/red connector together.

Ryan
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Old Apr 1, 2009 | 11:49 AM
  #26  
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are there any codes?
Do you have spark at the plug?
Can you post a log file?
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Old Apr 1, 2009 | 01:23 PM
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this may or may not be helpful. A few years back when i did my first ls engine pull out(wrecked car, section front end) i put everything back in and i had the same problem. Turned out to be a very small ground wire on the upper radiator support by the air box. I would just check to see if that is hooked up and has good ground. It is small enough to be easily overlooked.
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Old Apr 1, 2009 | 04:15 PM
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Originally Posted by rpmauto
this may or may not be helpful. A few years back when i did my first ls engine pull out(wrecked car, section front end) i put everything back in and i had the same problem. Turned out to be a very small ground wire on the upper radiator support by the air box. I would just check to see if that is hooked up and has good ground. It is small enough to be easily overlooked.
could very well be
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Old Apr 1, 2009 | 05:10 PM
  #29  
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Originally Posted by Schwanke Engines
are there any codes?
Do you have spark at the plug?
Can you post a log file?
No Codes,No spark at the plug, Dlove has the log files.

Originally Posted by rpmauto
this may or may not be helpful. A few years back when i did my first ls engine pull out(wrecked car, section front end) i put everything back in and i had the same problem. Turned out to be a very small ground wire on the upper radiator support by the air box. I would just check to see if that is hooked up and has good ground. It is small enough to be easily overlooked.
Going to look at it now
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Old Apr 1, 2009 | 08:08 PM
  #30  
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Does your scantool indicate rpm while cranking...?
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Old Apr 1, 2009 | 09:51 PM
  #31  
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Log shows vitals such as ect, iat, etc. No RPM, no crank signal, no cam signal. No errors from the either. no codes.

PCM is good, tried it on another car.

I think he is going to take the harness out and check for an open/short.
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Old Apr 2, 2009 | 10:29 PM
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Fixed

It was one wire was out of the pin on the crank sensor
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