Wierd Idle/Rev problem...

[SCOOBYSHAG]

ok check this out. This has happened to me a few times in my car. First off its a 91 S13 with S13 Blacktop SR installed.

Ok, I will hit the gas and the car hesitates then wont go over around 2k RPMS. No matter how hard I try and rev it, it wont exceed 2k RPMS. However then I turn on the A/C and it starts revving like normal, no problems. Even after I turn off the A/C the car runs fine. This happens every once in awhile. What could it be? MAF? ECU?

[ItzGenX]

when the maf goes bad or car doesnt have maf plugged in, the ecu will kick into safe mode and not let the car rev over 2k

[SCOOBYSHAG]

Ok so it must be the MAF but why would the A/C being turned on fix the problem or take the car off of safe mode? Hmmmm....

[ItzGenX]

might be loose wiring or connectors.

[SCOOBYSHAG]

yeah I will have to check it out...I am getting another MAF from a guy in case this one is bad...

[AznRide]

might as well get the 300Z mafs and upgrade your ECU to get more power.

[SCOOBYSHAG]

yeah dont have that kind of money right now though. But that brings up an excellent point. Should I go the JWT ECU route, the PowerFC route, Greddy Emanage route or the Apex S-AFC route?

[ItzGenX]

Haltech route ^_^

Get rid of the maf all together.