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08-09-2012, 03:25 PM
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#1
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Join Date: Jul 2008
Location: Blackwood/Laurel Springs
Posts: 518
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GTP stalling issues
My gf's 2001 gtp is having intermittent stalling issues. It will randomly stall and lose spark. Sometimes it will restart and run rough and other times it wont start at all. Ive replaced the maf, crank sensor, tps all due to codes, and even the pcm. I replaced the icm too then returned it cause the problem still was there. Im not sure what else to try. Figured id ask on here cause i got negative answers on grandprixforums.net
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2001 Trans Am WS6 6 speed - forged 6.0 with a stock cam and a rough idle
1994 Trans Am GT 6 speed - (sold)
1987 Camaro Iroc-Z - flintstone car(sold)
1992 Camaro RS - slow 305 6 speed (sold)
Quote:
Originally Posted by camaro2you
What is a opti?
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08-09-2012, 03:30 PM
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#2
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Whose coil packs are on there?
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08-09-2012, 06:52 PM
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#3
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Join Date: Jul 2008
Location: Blackwood/Laurel Springs
Posts: 518
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Quote:
Originally Posted by WildBillyT
Whose coil packs are on there?
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Stock gm packs
__________________
2001 Trans Am WS6 6 speed - forged 6.0 with a stock cam and a rough idle
1994 Trans Am GT 6 speed - (sold)
1987 Camaro Iroc-Z - flintstone car(sold)
1992 Camaro RS - slow 305 6 speed (sold)
Quote:
Originally Posted by camaro2you
What is a opti?
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08-09-2012, 07:56 PM
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#4
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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Any codes now? It only loses spark?
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08-09-2012, 08:55 PM
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#5
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Join Date: Jul 2008
Location: Blackwood/Laurel Springs
Posts: 518
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No the CEL isn't on now, but it loses spark and from what my friend said the injector pulse too, since the test light did not light up.
__________________
2001 Trans Am WS6 6 speed - forged 6.0 with a stock cam and a rough idle
1994 Trans Am GT 6 speed - (sold)
1987 Camaro Iroc-Z - flintstone car(sold)
1992 Camaro RS - slow 305 6 speed (sold)
Quote:
Originally Posted by camaro2you
What is a opti?
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08-09-2012, 09:02 PM
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#6
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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Did you use a test light or a noid light to test the injectors?
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08-09-2012, 09:13 PM
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#7
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Join Date: Feb 2005
Location: west orange nj
Posts: 2,415
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check the fuel pressure sounds like a cloged fuel filter or bad pump i had the same problem on the 88 gta
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08-09-2012, 09:15 PM
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#8
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Join Date: Mar 2007
Location: NJ
Posts: 540
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I've had issues with the underhood fuse blocks on them. they would run fine then just cut out and half of the fuse block would lose power. I want to say it was a faulty fuse block but I can't remember, may have been an ignition switch too. I think I have a test switch if you want to try it. Ignition switches were fairly common for other issues on them, mostly headlamps, radio and hvac turning on and off.
Does it restart immediately after it stalls? The ICM and MAF usually won't restart until they cool down for a while. I've also had a few issues with cam sensors. A cam sensor usually won't cause a stall tho.
Edit: I also had a Buick with a 3.8 that had loose terminals at the ICM connector, would run perfect for a while then just stall. Would occasionally restart. I could make it stall by manipulating the ICM connector while it was running. I have the terminals and the tools to repin the connector if it turns into this.
Last edited by Stevoone; 08-09-2012 at 09:21 PM.
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08-09-2012, 11:38 PM
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#9
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Join Date: Jul 2009
Location: barnegat nj
Posts: 1,340
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when you say..." sometimes wont start at all" do you mean it cranks over but doesn't fire or that it does nothing when you turn the key? I ve seen them shut off & no crank, then work fine from corroded battery terminals. could have bad module that the coils sit on too.
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Quote:
Originally Posted by SRGN
I never pulled into the staging beams at the track and saw a dyno in the other lane.
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South Jersey Racecraft
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08-10-2012, 07:07 AM
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#10
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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Yeah I was starting to think the module could be bad as well but he said he did an icm.
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08-10-2012, 12:43 PM
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#11
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Join Date: Jul 2008
Location: Blackwood/Laurel Springs
Posts: 518
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Quote:
Originally Posted by sweetbmxrider
Did you use a test light or a noid light to test the injectors?
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Im not sure what exactly its called but it plugs into the injector plug.
Quote:
Originally Posted by chrisfrom nj
check the fuel pressure sounds like a cloged fuel filter or bad pump i had the same problem on the 88 gta
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Fuel pressure is perfect.
Quote:
Originally Posted by Stevoone
I've had issues with the underhood fuse blocks on them. they would run fine then just cut out and half of the fuse block would lose power. I want to say it was a faulty fuse block but I can't remember, may have been an ignition switch too. I think I have a test switch if you want to try it. Ignition switches were fairly common for other issues on them, mostly headlamps, radio and hvac turning on and off.
Does it restart immediately after it stalls? The ICM and MAF usually won't restart until they cool down for a while. I've also had a few issues with cam sensors. A cam sensor usually won't cause a stall tho.
Edit: I also had a Buick with a 3.8 that had loose terminals at the ICM connector, would run perfect for a while then just stall. Would occasionally restart. I could make it stall by manipulating the ICM connector while it was running. I have the terminals and the tools to repin the connector if it turns into this.
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Sometimes it immediatly starts and sometimes not. I played with the icm and pcm harness and nothing. Still won't start and when its running if I play with the harness it does not stall.
Quote:
Originally Posted by S.J.SLEEPER
when you say..." sometimes wont start at all" do you mean it cranks over but doesn't fire or that it does nothing when you turn the key? I ve seen them shut off & no crank, then work fine from corroded battery terminals. could have bad module that the coils sit on too.
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It always cranks, just wont fire sometimes. When it does start back up immediatly I have to hold the gas down to keep it running it will dump black smoke and sound like it has a huge cam, then it will clear itself out and run perfect..until it stalls again.
__________________
2001 Trans Am WS6 6 speed - forged 6.0 with a stock cam and a rough idle
1994 Trans Am GT 6 speed - (sold)
1987 Camaro Iroc-Z - flintstone car(sold)
1992 Camaro RS - slow 305 6 speed (sold)
Quote:
Originally Posted by camaro2you
What is a opti?
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08-10-2012, 12:49 PM
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#12
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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I know it's a 2001 model year, but since it buts up to the end of the documentation...
Does it have a fuel pressure resistor?? If so, get rid of that regardless of if it's the problem.
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08-10-2012, 09:03 PM
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#13
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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The coil packs bolt down to the icm. There are two pins that rise up per pack and penetrate it from the underside. When its not starting, take a test light and key on check for power on one pin. Then check while cranking that the other pin pulses ground.
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