HELP strange power cut please HELP
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Burning Brakes
Joined: Feb 2004
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From: Jeddah
HELP strange power cut please HELP
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 ?????????????????? :bang:
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 ls1tech
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 ?????????????????? :bang:
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 ls1tech
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St. Jude Donor '15
Burning Brakes
Joined: Jul 2003
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From: Santa Cruz CA
Look to the ignition.
From your description and the video it would seem to be related to the ignition or the associated electronics. Doesn't sound mechanical in any way. Almost like there is a ground fault to something and the computer steps in and cuts the spark. That is the area I would focus on to debug it. If it is a fast short like that, the ECU might not get the codes stored. That the tachometer is also reading inconsistently would seem to confirm that the signals or the ignition itself is not doing what it is supposed to. Just my thoughts.
Thread Starter
Burning Brakes
Joined: Feb 2004
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From: Jeddah
From your description and the video it would seem to be related to the ignition or the associated electronics. Doesn't sound mechanical in any way. Almost like there is a ground fault to something and the computer steps in and cuts the spark. That is the area I would focus on to debug it. If it is a fast short like that, the ECU might not get the codes stored. That the tachometer is also reading inconsistently would seem to confirm that the signals or the ignition itself is not doing what it is supposed to. Just my thoughts.
Thread Starter
Burning Brakes
Joined: Feb 2004
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From: Jeddah
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Thread Starter
Burning Brakes
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From: Jeddah
Tech Contributor
Joined: Apr 2007
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From: Forney Texas
From your description and the video it would seem to be related to the ignition or the associated electronics. Doesn't sound mechanical in any way. Almost like there is a ground fault to something and the computer steps in and cuts the spark. That is the area I would focus on to debug it. If it is a fast short like that, the ECU might not get the codes stored. That the tachometer is also reading inconsistently would seem to confirm that the signals or the ignition itself is not doing what it is supposed to. Just my thoughts.
Thread Starter
Burning Brakes
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From: Jeddah
here is another video of that run from the a very good frind of mine and also the dyno operator
http://www.youtube.com/watch?v=gE9ae...layer_embedded
http://www.youtube.com/watch?v=gE9ae...layer_embedded
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From: West Norriton PA
St. Jude Donor '08
Much better video.
have you checked codes ? and if so what are they ?
have you checked codes ? and if so what are they ?
here is another video of that run from the a very good frind of mine and also the dyno operator
http://www.youtube.com/watch?v=gE9ae...layer_embedded
http://www.youtube.com/watch?v=gE9ae...layer_embedded
Thread Starter
Burning Brakes
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From: Jeddah
Race Director
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From: West Norriton PA
St. Jude Donor '08
The misfire code which cylinder(s) threw the code ? P0307 would indicate cylinder 7, etc ..
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Burning Brakes
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From: Jeddah
thanks once more
Race Director
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From: West Norriton PA
St. Jude Donor '08
Not sure if your problem is speed related or RPM related. Have you tried testing this by using other gears to see if it is speed or RPM related ?
If it's RPM related it could be a number of issues.
Bad Coil, wires, spark plugs, injectors or fuel related ??