CEL and no codes

[jayro]

So I had some issues a while back (thought it might be PCM) that only come up when it's hotter out. Reset the codes and havn't had an issue since.
Today it was hot agian and it happened agian. When I let off the gas, the RPM's stayed at about 3.5K. THe throttle body wasnt stuck. When I would push the clutch in the rpms stayed at 4K. If I floored it it would start bucking like crazy. The check engine light came on and then went out. When I stopped the idle was irratic. I immediatly grabbed my paperclip from inside and pulled the codes. Nothing came up. The test ran fine...I got a 511 for my LPM and then just 111. I did it 3 times with the same result. I do have an extra PCM to try if you guys think it's worth a shot. Ideas?

Jeremy

 

[Huntervf]

I can't remember if your LPM is programmed for the 75mm or not. If it's not...

I'd put the stock MAF back in before switching PCMs. I've seen MAFs set a CE light before without setting a code, and if the PCM is running the tests alright, I'd leave it be.

 

[jayro]

I'll give it a try. Problem is the issue id so intermitant that it is hard to tell if it is fixed or not. Drove it today with no issues.

Jeremy