I let my 94 RX sit for a few days in the northeast and then it wouldn't start. Did the ATF treatment, changed the oil, and plugs. Starts up fine. When I am driving w/out boost it is fine. The second my boost gauge gets past 1psi the car studders and backfires about a 4ft flame. I'm thinking injectors or the PFS Purple ecu. I can slowly bring the rpm's up to 6500 without boost with no problem. Could the PFS ecu just all of a suuden quit? This ever happen to anyone?
Here are some of my engine mods:
KD Ported Motor
PFS PMC ECU
M2 DP,SR MP, RB CAT-BACK
M2 AirBox, M2 Large Intercooler
KD FAN Mod

Thanks in Advance Guys!

 

Check the boost sensor on the driver's side firewall. Should have a small hose attached to the bottom.

I am just guessing....


Later,
Patrick

 

Sounds to me either a massive failure of spark, coil/leads/plugs/igniter?
Is your computer additional to the standard if not ignore my ignorance if it is additional it could be that your car is in default mode ie the car is on limp home mode. This can be caused by such electrical faults as oil injecter fault code. there are several other faults which can put a vehicle on 'limp home mode' and there is a diagnostic method of establishing which electrical fault it is
Any developments your end?

 

Patrick is probarbly right the boost sensor is the first place to look
Chris

 

Guys,
Reset the Factory ECU and we are in business!
Thanks for the quick replies!
ViperEater