Thread: SS M90 Question...

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  1. #21 Re: SS M90 Question... 
    GTP Level Member Bedwards's Avatar
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    I changed my coolant elbows this morning. It started up after that. However, after I attempted doing a CASE Relearn (which I don't think succeeded), the car wouldn't start again. Could I have flooded it with the revving? When it finally did start (which took a lot of cranking), I got black smoke out of the exhaust for about 30 seconds, and I could smell gas...

    Here's a picture of what came out of my exhaust after I revved it:

    Last edited by Bedwards; 03-02-2010 at 03:30 PM.
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  2. #22 Re: SS M90 Question... 
    GTP Level Member Bedwards's Avatar
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    I'm getting the P0300 code, however I noticed my scan gauge is telling me there are misfires on Cylinder 2. I'm going to check the plug and wire.
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  3. #23 Re: SS M90 Question... 
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    You check the plug?
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  4. #24 Re: SS M90 Question... 
    GTP Level Member Bedwards's Avatar
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    Quote Originally Posted by minichopper6hp View Post
    You check the plug?
    I'm about to go check. I'm just eating and resting my back. I don't know how mechanics do this for a living haha.
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  5. #25 Re: SS M90 Question... 
    GTP Level Member Bedwards's Avatar
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    I'm replacing the wires right now. Hopefully this fixes it.
    Last edited by Bedwards; 03-02-2010 at 06:36 PM.
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  6. #26 Re: SS M90 Question... 
    GTP Level Member Bedwards's Avatar
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    ****! I'm getting more misfires. They are random and are jumping around to nearly every cylinder. Could it be the coil? Can I replace my GTP coils with my GT coils ontop of the coil bracket plate, or are the coils different altogether? By the way, my fuel pressure is sitting around 45 psi at idle.
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  7. #27 Re: SS M90 Question... 
    youtu.be/xhrBDcQq2DM FoSHO99's Avatar
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    What are you scanning with? Any way you can post up a scan? I don't think 1 wire is your issue, i think its either multiple wires/coils or running way too rich, possibly due to the wrong ifr tables in the pcm or wrong maf table? I would not drive it or rev it until it idles well.

    Switch the whole ICM+coil packs from the gt to the gtp.
    2001 GTP PT61 Turbo, E85, Stock Motor
    2011 Chevy Cruze MT6 1.4L Turbo
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  8. #28 Re: SS M90 Question... 
    Donating Users silverstreak's Avatar
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    Quote Originally Posted by Bedwards View Post
    ****! I'm getting more misfires. They are random and are jumping around to nearly every cylinder. Could it be the coil? Can I replace my GTP coils with my GT coils ontop of the coil bracket plate, or are the coils different altogether? By the way, my fuel pressure is sitting around 45 psi at idle.
    I think you have a very big vacuum leak
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  9. #29 Re: SS M90 Question... 
    GTP Level Member Bedwards's Avatar
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    Quote Originally Posted by FoSHO99 View Post
    What are you scanning with? Any way you can post up a scan? I don't think 1 wire is your issue, i think its either multiple wires/coils or running way too rich, possibly due to the wrong ifr tables in the pcm or wrong maf table? I would not drive it or rev it until it idles well.

    Switch the whole ICM+coil packs from the gt to the gtp.
    The coil packs won't work with the ICM? Those connectors are so hard to get at.
    Last edited by Bedwards; 03-02-2010 at 07:25 PM.
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  10. #30 Re: SS M90 Question... 
    GTP Level Member Bedwards's Avatar
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    I used an Aeroforce gauge to scan. Here are some of the parameters. I'm clueless in this department.

    MAP HG/PSI = -20.6
    MAP KPA = 28
    BOOST = -20.6
    MAF LB/M = 0.58
    MAF FREQUENCY =2445
    IGNITION ADV. = 20.5
    LONG TRIM = -25
    SHORT TRIM = -14
    IAC = 41
    CMD A/F = 14.7
    INJ FLOW MM3 = 4
    BAROM PSI = 12.9
    INTAKE AIR DEGREES F = 57
    MISFIRES: 40
    Last edited by Bedwards; 03-02-2010 at 07:28 PM.
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  11. #31 Re: SS M90 Question... 
    GXP Level Member BwolfGT's Avatar
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    What's your cat looked like? My old one was horrible and that picture looks like that black **** that came out of it when I took it off.
    1998 GP GT - Topswap - Ported M90 - N* - 4" FWI - Poly Mounts - 3" DP - 180 Tstat - Alt. Rewire - 3.29 gearing - Full Exhaust - Custom Tune
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  12. #32 Re: SS M90 Question... 
    GTP Level Member Bedwards's Avatar
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    Quote Originally Posted by BwolfGT View Post
    What's your cat looked like? My old one was horrible and that picture looks like that black **** that came out of it when I took it off.
    Its a brand new downpipe from ZZP. Maybe has 5000 km on it.
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  13. #33 Re: SS M90 Question... 
    GTP Level Member Bedwards's Avatar
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    Quote Originally Posted by silverstreak View Post
    I think you have a very big vacuum leak
    Would that cause the car not to start 50% of the time, misfire on almost every cylinder, and spray black **** out of the exhaust?
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  14. #34 Re: SS M90 Question... 
    Donating Users silverstreak's Avatar
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    Quote Originally Posted by Bedwards View Post
    Would that cause the car not to start 50% of the time, misfire on almost every cylinder, and spray black **** out of the exhaust?
    Ya, but your fuel trims would be in the (+)
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  15. #35 Re: SS M90 Question... 
    youtu.be/xhrBDcQq2DM FoSHO99's Avatar
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    Quote Originally Posted by Bedwards View Post
    THe coil packs won't work with the ICM? Those connectors are so hard to get at.
    It's one bolt towards the bottom of the coil packs to unplug the connector and 3 nuts under the coil packs/icm to release the icm with the coil packs still connected. Switch them.

    Quote Originally Posted by Bedwards View Post
    I used an Aeroforce gauge to scan. Here are some of the parameters. I'm clueless in this department.

    MAP HG/PSI = -20.6
    MAP KPA = 28
    BOOST = -20.6
    MAF LB/M = 0.58
    MAF FREQUENCY =2445
    IGNITION ADV. = 20.5
    LONG TRIM = -25
    SHORT TRIM = -14
    IAC = 41
    CMD A/F = 14.7
    INJ FLOW MM3 = 4
    BAROM PSI = 12.9
    INTAKE AIR DEGREES F = 57
    Your fuel trims are telling us that its really rich and pulling fuel to compensate, your inj. pulse is at 4 which is very high for idle, was this a spike during idle or a normal idle? If there was a vac leak, the car would be adding fuel or the fuel trims would be at +16 or so. Its also hard to tell until you get it idling normally. You might even want to give the GT injectors a try. The GT inj. are 33# and the GTP inj. are 36# or so, when tuning a top swap, if they don't put the correct tables in and your using higher # inj now, that would make it run rich. I am unsure if that would make it run THAT rich though.
    2001 GTP PT61 Turbo, E85, Stock Motor
    2011 Chevy Cruze MT6 1.4L Turbo
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  16. #36 Re: SS M90 Question... 
    Donating Users silverstreak's Avatar
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    Start with the coils packs and icm. Swap them out and see what happens.
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  17. #37 Re: SS M90 Question... 
    GTP Level Member Bedwards's Avatar
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    Quote Originally Posted by FoSHO99 View Post
    It's one bolt towards the bottom of the coil packs to unplug the connector and 3 nuts under the coil packs/icm to release the icm with the coil packs still connected. Switch them.
    Ohhh. I meant the connectors down by the pulley.

    Quote Originally Posted by FoSHO99 View Post
    Your fuel trims are telling us that its really rich and pulling fuel to compensate, your inj. pulse is at 4 which is very high for idle, was this a spike during idle or a normal idle? If there was a vac leak, the car would be adding fuel or the fuel trims would be at +16 or so. Its also hard to tell until you get it idling normally. You might even want to give the GT injectors a try.
    Hmmm. This was at normal idle. It may be off a bit, as the car was misfiring while I took the readings. I can't use my GT Injectors because I've already spliced all the wires with the new GTP injector connectors.
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  18. #38 Re: SS M90 Question... 
    GXP Level Member BwolfGT's Avatar
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    Did you ever chck the vac lines? That would make it run rich.
    1998 GP GT - Topswap - Ported M90 - N* - 4" FWI - Poly Mounts - 3" DP - 180 Tstat - Alt. Rewire - 3.29 gearing - Full Exhaust - Custom Tune
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  20. #40 Re: SS M90 Question... 
    GTP Level Member Bedwards's Avatar
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    Replaced the coils and ICM, didn't help it. Can I just keep these coils and ICM on, or should I change them back to the GTP ones? I don't think it makes a difference. I'm having trouble identifying if there is a vacuum leak or not.
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