Have had this code pop up twice now. Once on the track a year ago under heavy rain, and this morning.

P1508 - Torque comparison function monitor - signal implausible

Loud pop, then no acceleration.

I clear the code and reset, and car runs fine.

Possible bad DME, software and MAF.

Running MAF less tune, physically removed MAF sensor, Cobb custom tune.

Most think it is the MAF sensor but I have not seen a specific solution and or reason for this code.

My guess is that the DME is fine, and obviously running mafless, so maybe a glitch?

If anyone has any more info that can help, please share.

Thank you.

 

Limp mode. I got it when I forgot to tighten the clamp of the Ypipe. Large leak will cause this.

 

No boost leaks, recently had motor out for several things everything tight. Drove it after clearing code and definitely hitting boost targets.

 

but it was fine before you had the motor out right? if so, human error...

 

It happened about a year ago on the track, before the motor was removed.

 

Yup had this code and my TB was dirty and had a leak there too. Clean it first and should be good to go.

 

do you have a oem TB and plenum?

 

Stock TB and plenum. Did have to TB out a while ago, and visually inspected it.

 

Even tho the TB doesnt look dirty it is after years of running. Replace the gasket too.

 

Ok, I'll check out TB. Problem is there really isn't a way to confirm if it solves the issue or not, because the code is sporadic and really no way for me to reproduce it.

 

The code will not pop up again.

 

Specific way to clean it?

 

First you need the TB gasket then you unbolt it and spray it down with TB cleaner.

 

Ok, appreciate the suggestion.

 

Welcome. I hated that code.