bripab007

If the car's idle/closed-loop/low-throttle-application/engine-in-vacuum was affected by R&R'ing the Vortec FPR, then either it's broken or you have the fuel plumbed incorrectly. Cleaning the FPR shouldn't have caused the issue to get better or worse when driving in vacuum.

Oh, wait, you said it seems to work fine under WOT and/or once the engine's up to operating temps? Perhaps the O2 sensor is throwing some crazy values at the ECU while it's warming up? Although typically the ECU shouldn't even car about the O2 value until the car's reached a certain temp.

I guess my money's on base timing (perhaps it's too low...enough so to cause issues when in overly-rich warm-up mode) or something involving the FPR.

olderguy

iTrader: (19)

For what it is worth; when my 4 wire O2 crapped out, I went back to the OEM single wire that started out in the car in the first place. It is mounted right after the turbo in the RMDP. A couple of times recently I have just started the car and taken off cold and get all sorts of bogging, CEL, and stalling. It is definitely being made much worse because if I hit the slightest boost the Emanage throws in even more fuel because of the O2 signal being low or non-existant. As soon as the O2 heats up, everything is fine.

andrepascal

As posted earlier i have cleaned the AFM contacts, but i didn't tension the brush sliding over the contacts to much. And it made no difference. Now i have tensioned the brush a little more, this seems to work a lot better.

Braineack

iTrader: (62)

It's not the FMU's fault, it's the increased intake temperature's fault (ping)....Throw an intercooler on there, drop the intake temps, advance the timing.

danscreations

iTrader: (6)

If I had the cash I'd own it. Would you suggest purchasing a bipes first to advance the timing or intercooler and advance a little till I get a bipes.

Braineack

iTrader: (62)

Even at a low boost level with Bipes you can at least have a 10°, 12°, 14°, 16° base and pull to 6°.

jayc72

iTrader: (14)

This might be a possibility.

4sfed5

my car does it too.... it just hiccups while cruising at 70mph. It might do it once every 40 miles or so then fine. It just has one very short hiccup then back to normal again...

tabs604

mines still doing it after all i changed.

I really am at the end of my teather.

Only thing I have not changed is the fuel filter and the Vortech fpr.

I am gonna go to the dyno to see what AFR's the car has.

I really feel like ditching the turbo at the moment.

stupid car.

danscreations

iTrader: (6)

Took it off and put in the plug! Ran around for a day no change... Check that one off. I set my o2 clamp to (.40) inbetween full rich and stoich a few weeks ago and that seemed to help some. Been messing with the the vac/boost switch and seems to stop doing it as much the later I kick in the clamp. Of coarse transition to boost then again sucks. Gotta be a combo of not enough timing and too much fuel. When the car heats up will burn all the fuel more effecently.