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      09-16-2018, 10:20 AM   #1
Sliiiiick
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At the track - Need Help!!!

Iím currently at Sebring track for a two day event. First run yesterday was good, oil temps at 210F, boost at 17psi, car pulled hard to 6500rpm.

During the second session, all of a sudden the car would only hit 5psi and wouldnít go past 4500rpm. Itís not full limp mode and acceleration was still smooth, but rpm and speed was frustratingly limited. DTC and ABS lights came up on the dash. Obviously the car is limiting and preventing itself due to some issue.

I figured it may have been an overheating issue considering outside temps were 93F and other cars experienced similar issues.

Come back out fresh this morning and my cold car immediately starts doing the same thing on the orientation laps!

I pulled codes from the car and looking for diagnosis help:

P15B9 - check valve intake manifold
P152B
P15DB
P1505 - idle speed control valve closing solenoid
P32C9 - no wheel speed signal received
P32D7
P32D9 - general vehicle speed sensor error
P32DF - vehicle speed sensor front right
P32DA - difference in signals from the left and right front wheel speed sensors

Interestingly I replaced the wheel speed sensors only 6 months ago, and I just checked both of them again today. I donít care much about the DTC or ABS because I normally drive with them off anyways. But could that still cause acceleration problems?

I need help getting my car back to full speed!!!

Last edited by Sliiiiick; 09-16-2018 at 01:00 PM.
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      09-17-2018, 06:14 PM   #2
Ginger_Extract
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Dunno about the P15x codes, but I'd wager you have a boost leak somewhere.

RE: speed sensors. They are your culprit. With this car, when the wheel speed sensors act up, all hell breaks loose. Clear codes, check the sensors and go from there.
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      09-18-2018, 05:38 PM   #3
Sliiiiick
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Quote:
Originally Posted by Ginger_Extract View Post
Dunno about the P15x codes, but I'd wager you have a boost leak somewhere.

RE: speed sensors. They are your culprit. With this car, when the wheel speed sensors act up, all hell breaks loose. Clear codes, check the sensors and go from there.
Thanks for your reply. I agree the wheel speed sensors can cause havoc and I just ordered new ones.

I originally thought it was a boost leak too so I checked my throttle body, charge pipe, intercooler connections and all looked good.

After my original post about only hitting 5psi, I went out on the track a couple more times to try and pin point the problem. The car would pull very strong and gauges showed peak boost in all gears right until 4,500 then all power lost...
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