I have a V2 WRX with cat back exhaust and ESL daughter board.
My problem is the car will die occasionally, for no apparent reason. If I'm travelling at speed when it happens I don't get any power at all (the engine is not firing) until is springs back to life. If it happens at a junction, the engine will die and not start again until I'm on my 4th or fifth attempt. It just dies!
So far, I have checked and cleaned the MAF, TPS and Idle control valve, and run the onboard diagnostics (which doesn't report any faults, despite the engine light coming on when the motor dies).
Anyone got any ideas?

Edited to add that the problem always happens at low rpm (less than 3k) and when I'm just pootling about (not on boost).

 

if its not logging a fault its probably simple maybe an air leak ?

 

Possibly, thanks.
I'll check for leaks in the morning and see what I can find...
Any other ideas?

 

as above dv leaking

 

...

 

Wouldn't the camshaft sensor throw an error?

 

edited cos i was wrong..this would cause lazy start

 

No worries. If I can narrow it down it will help so much with fault finding. These inconsistent "bugs" can be a nightmare to find...

 

No, mine was temperamental for quite some time before it threw out an error code.

 

Interesting. I'll have to look into it. Are there any diagnostic tests that you can do with a cam sensor?

 

i had similar on my v3 ra - it was a faulty maf - replaced and car was back to normal

 

Thanks, I'll take a look at that as well. Would that show up if I disconnected it while running?

 

Check the conection at the fuel pump mate,they some times start to burn out at the plug conection where it goes into the sender

 

Thanks mate. That's an easy one. I really hope it's that!

 

Yup, mine was a partially melted fuel pump electrical connector.