Steven89Iroc

To follow up on this thread, but slightly different thoughts...

https://www.thirdgen.org/forums/dfi-...home-mode.html

I have a '90 IROC, L98 mostly stock (except the turbos) 6-speed, '7730, running $58 (poor tune, but it ran well enough) and 47lb/hr injectors (upped FP on 42's). Was originally an LB9 5-speed car, so limp-home mode is for that combo.

It goes in and out of limp-home mode but mostly stays in limp-home (and barely runs of course), I'm sure of it. What else could it be when I fully remove the EEPROM while still running and nothing at all changes?

Anyway, I've ruled out the ECU... Bought a reman'd parts store '730, then an original '92 Firebird V6 '730 from a JY (they tested it) just to be sure, I've swapped EEPROMS, tried the old $8D code (and MAP sensor) I had tuned well before the turbo install, back to the $58, and the problem doesn't change.

So, what mechanically might cause the ECU to freak out and go into limp-home mode? When I first start it, occasionally it will run perfect without any SES for a short time. I datalogged briefly before the datastream froze upon jumping back into limp-home, everything appeared fine when it was running fine.

Might be coincidence or a direct cause, but the same day this came about my heater core sprang a leak. None of the new ECU stuff is wet or touched by coolant at all.

I'm at a loss.

doc

You are running some crazy stuff, I have no idea whats going on in your case. I do know that with my '87 MAF car, it was the 33 error code that would put the ECM into "limp home mode". Are you throwing an error code?

Ronny

iTrader: (1)

Are you using a ZIF? My ZIF was not soldered in place(sat in original socket) and gave me intermittant contact and flipped into limp too often.