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HELP strange power cut please

Old 08-23-2009, 01:12 PM
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Default HELP strange power cut please

Hi to you I need your HELP PLEASE all i haven’t been writing over here because I was busy rebuilding my motor after i destroyed three pistons.
make a story short and the rebuilt is done , i took the car to the dyno and didn’t have one clean nor decent run tell know , my car is a corvette twin turbo LPE last i have made with it was 672WHP dyno jet with old set up.

PLEASE HELP ME , now i am in a big dilemma and i am lost , while the car is on the dyno and i am WOT to do a tune the car starts very smooth and accelerates great all the way up to about 4K RPM and some times 5K RPM and it cuts in a very strange way you can have a look at the video here under at the minute 1:01
You can see that something very strange happens and the check engine comes on for a moment and then disappears ??????????????????


http://www.youtube.com/watch?v=tc3AiiiHO1k




Some thought was to a faulty Crank sensor, some a faulty Camshaft sensor, and some to faulty MAP sensor , when i did the DTC with the HP tuner it showed a miss fire but not permanent HELP

Here in video 2 you can see the tacho meter bouncing at about 5Krpm or so but the car did not CUT like it did the last couple of times but the tach bounced any gusses any takes HELP PLEASE

thanks


Please note this same thred was posted to COREVETTEFORUM and on the forced induction forum ?
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Old 08-23-2009, 08:33 PM
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HELP me
Old 08-24-2009, 09:19 AM
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Fuel psi where it should be?
Plug gap too wide?
Valve springs good?
All wiring checked?
Wideband sensor in use?
Old 08-24-2009, 09:46 AM
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Post your tune.

Maybe the PCM is loosing power/restarting?

I would think with a misfire, the CEL would stay lit and not on/off without cycling the key...
Old 08-24-2009, 07:47 PM
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Originally Posted by Old Geezer
Fuel psi where it should be?
Plug gap too wide?
Valve springs good?
All wiring checked?
Wideband sensor in use?
thanks for the reply

plug gap OK

valve springs very OK

wiring still cheking ????

wide band sensor OK
Old 08-24-2009, 07:49 PM
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Originally Posted by waynehartwig
Post your tune.

Maybe the PCM is loosing power/restarting?

I would think with a misfire, the CEL would stay lit and not on/off without cycling the key...
tune

https://ls1tech.com/forums/attachmen...ing-666whp.hpt

scan

https://ls1tech.com/forums/attachmen...p-dyno-cut.hpl
Old 08-24-2009, 07:51 PM
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here is another video


http://www.youtube.com/watch?v=gE9ae-HbjGg
Old 08-24-2009, 08:17 PM
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You've gotta have something going on electrically... Maybe something with a motor mount? or a ground?
Old 08-24-2009, 09:33 PM
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Originally Posted by waynehartwig
You've gotta have something going on electrically... Maybe something with a motor mount? or a ground?
ground ????mmmmmmmmm that sounds good enough i am cheking them now as i type this
Old 08-24-2009, 09:36 PM
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after cheking my DTC i found thise 2 codes

PCMP0300 engine mess fire detected (pending) current (immature)
and
unknown u1096 loss of comunecation with IPC ( history ) (imature)
Old 08-24-2009, 10:42 PM
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Originally Posted by sultan(ZR-1)KSA
ground ????mmmmmmmmm that sounds good enough i am cheking them now as i type this
Originally Posted by sultan(ZR-1)KSA
after cheking my DTC i found thise 2 codes

PCMP0300 engine mess fire detected (pending) current (immature)
and
unknown u1096 loss of comunecation with IPC ( history ) (imature)
I think you are loosing power somewhere for some reason. I think that's causing the misfire and everything else.

The reason I said motor mount, is I've seen engines not completely secured (ie bad mounts) move, and when they move, cause wires to pinch or etc.

In the second video your wideband completely kills off and looks like it would if the motor wasn't even running ---'s.

...And to top it off, this is a new setup for you.
Old 08-25-2009, 12:21 AM
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Originally Posted by waynehartwig
I think you are loosing power somewhere for some reason. I think that's causing the misfire and everything else.

The reason I said motor mount, is I've seen engines not completely secured (ie bad mounts) move, and when they move, cause wires to pinch or etc.

In the second video your wideband completely kills off and looks like it would if the motor wasn't even running ---'s.

...And to top it off, this is a new setup for you.
i never noteced the wide band doing that even after seeing the video like 100 times
Old 08-25-2009, 11:18 AM
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Originally Posted by sultan(ZR-1)KSA
i never noteced the wide band doing that even after seeing the video like 100 times
That's what is nice about a second set of eyes...
Do you notice in the video the speedo staying pegged?
Maybe your just hitting the speed limiter?

Does the motor actually die?
Old 08-25-2009, 12:56 PM
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no the motor dose not die , also this is in KMH and the limeter is set at 400MPH so its not a speed limeter
Old 08-26-2009, 09:47 PM
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Thanks guys we found the problem and we fixed it , it was the grounding wire to ignetion moduals it was repped in three difrent places


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