HELP strange power cut please HELP

[sultan-LPE-TT]

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 LS1tech

[Ryan@Lingenfelter]

Do you have any data logs, dyno info, AFR, boost numbers?

[sultan-LPE-TT]

here are my DATA LOG from the run , boost was at 13.5PSI afr 11.8 ,

http://www.ls1tech.com/forums/attachments/forced-induction/193987d1251063762-help-strange-power-cut-please-help-dyno-cut.hpl

[Ryan@Lingenfelter]

It looks like the left bank O2 sensor is not functioning at all and the right bank has a misfire. Look to make sure that the Left bank O2 sensor is connected, if so check your 5 volt references and then check grounds on the back of the heads, and chassis. Please check these things and let me know.

[sultan-LPE-TT]

Hi Ryan

thanks for the reply , i have all the O2 sensors canceld on my car and i am using an AEM wide band instead.
as i am writing this we are cheking the grounds on the car ,

what do you meen about the 5 volts refrence do you meen from the signal of the standard O2 sensors ?

[sultan-LPE-TT]

also here is another video of the same run

http://www.youtube.com/watch?v=gE9ae-HbjGg&eurl=http%3A%2F%2Fwww%2Els1tech%2Ecom%2Fforums%2Ff orced%2Dinduction%2F1167493%2Dhelp%2Dstrange%2Dpow er%2Dcut%2Dplease%2Dhelp%2Ehtml&feature=player_embedded

[sultan-LPE-TT]

after cheking my DTC i found these

PCMP0300 engine mess fire detected (pending) current (immature)
and
unknown u1096 loss of comunecation with IPC ( history ) (imature)

[Ryan@Lingenfelter]

One of the O2 sensor's is reading from rich to lean (this could be the reason for the misfire code) etc. And the other one does not look like it is functioning. The wideband does not comunicate with the ECM it just tells the driver where the air/fuel ratio is.

[sultan-LPE-TT]

One of the O2 sensor's is reading from rich to lean (this could be the reason for the misfire code) etc. And the other one does not look like it is functioning. The wideband does not comunicate with the ECM it just tells the driver where the air/fuel ratio is.

I have been running my car like this for the last year and a half with not a problem at all , i wonder y it started now ???

[sultan-LPE-TT]

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

[Ryan@Lingenfelter]

Good deal! Bowtie Smilie

[dallasstx]

Good news !

Congratulations on finding the electrical gremlin.

[CorvetteDon]

Good call.