Back again with another post (03 WRX running 330 BHP with full decat and K&N 57i induction)

Previously I thought the MAF was knackered as the car was idling like sh*te and when you took the MAF wiring harness off the car idled fine.

I also had to do the CEL fix for the EGT.

I've just bought a Mac Tools ET50 and cleared the fault codes and now the car starts fine when COLD and appears to idle ok unless you rev the car. When you do this the revs drop almost low enough for the car to stall.

When the car is warmed up, if you switch off the ignition and try to start her again, she won't start unless you hold the revs up.

When she is idling ok and you remove the MAF wiring harness the car stalls which would indicate the MAF is indeed fine.

Could this be the crank sensor or an 02 sensor??? No more error codes exist either.

Help tech guys

 

Just cleaned the Crank Sensor (which was dirty) but still the car won't start properly when the engine is warm without giving it some revs - the revs also drop very low when you rev the car and let it settle to an idle ....

Cam Sensor, o2 sensors, hmmmmmm........