Extremely rich idle

[cteepe09]

Hey it also could be you ecu chip is shot I race beretta's I played with different chips and found that some will make it run rich which is good if ya want more power? Also ck voltage on your tps sensor make sure it works right should be .5 at idle and 4.5 open wide open hope it helps

[55trucker]

Try this......If you indeed do have a stuck open injector....run the engine at idle (you did say this problem is only at idle?) so the problem occurs.....shut the engine down and pull all the plugs. If there is only one (or more rich cylinder) the plugs should tell you which cylinders are rich. If they all are wet or fluffy black then the problems not necessarily injectors but is common to all cylinders and the rich situation is elsewhere as has been suggested above.

[weba]

Maybe one from a Quad fits, worth a try..

[3400-95-Modified]

Upper plenum gasket should survive pretty well... Just be careful when removing it.

Basically whats left is a faulty reading O2 or stuck injector... You could try to just throw an O2 at it but I don't know how much that is over there.

[weba]

Didn't see or smell any traces of fuel on it. Visual check is OK.

So what's left basically is stuck injector? I'm going to pull the intake off tomorrow and try my multimeter on them. I hope that does not cause intake leaks since getting new gasket sooner than 2 weeks is pretty hard.

[3400-95-Modified]

The hose going from T\B to the FPR seems to be ok, but it has a T-piece on it and i cannot see the condition of that extra hose leaving from it.. where does it go?

Its more or less just check to make sure that there is vac at the line going to the FPR, and that the line is not full of gas... that would show a bad diaphragm on the modulator which is leaking back into the vac system.

[robertisaar]

It's about 19F where my car is, i guess the warm~ engine bay radiates the heat to the sensor?

yes it will. anytime you're standing still, with the engine on or off, once the motor has started to warm up, it heat soaks the IAT.

[weba]

It's about 19F where my car is, i guess the warm~ engine bay radiates the heat to the sensor? (touching the intake pipe tells it's hot)

I need to check the vacuum hose on the FPR.. damn i wish there would be more room.

The hose going from T\B to the FPR seems to be ok, but it has a T-piece on it and i cannot see the condition of that extra hose leaving from it.. where does it go?

[robertisaar]

IAT shows 94F after started engine and slowly going down.

This time BLM was 128 and INT was 131, they seem to vary a bit.

Anyhow the idle HC readings (unburned fuel) was 5 times off the limits of what is legally allowed here.

So your guesses are stuck injector or faulty FPR? Great, nothing that i could find a replacement fast here...

well, a 128 BLM is perfect fueling(or at least the O2 thinks so), so fueling may not be your issue(unless the O2 is junked)...

as for IAT: i'm not sure what kind of weather finland has.

[weba]

IAT shows 94F after started engine and slowly going down.

This time BLM was 128 and INT was 131, they seem to vary a bit.

Anyhow the idle HC readings (unburned fuel) was 5 times off the limits of what is legally allowed here.

So your guesses are stuck injector or faulty FPR? Great, nothing that i could find a replacement fast here...

[robertisaar]

a BLM of 118 is only 8.5% rich... meaning without O2 correction you're actually at 13.6:1 AFR instead of 14.7:1.

not sure why, but before tuning, wifey's GP ran at like 104BLM at idle... that's 11.95:1 without O2 correction.

what kind of fuel are you running?

the dash guage is about as accurate as one from a 1940 russian tank, so you can disregard it since the one the ECM reads is obviously working correctly.

[IsaacHayes]

Injector, or check the FPR make sure it's not leaking and dumping fuel back through the vacuum hose...
IAT would make it run richer some too, what's it show for intake temps...

[weba]

Don't know about fuel pressure, i don't have anything to use measuring it.

Is there any way to test the injectors without taking the upper intake away?


MAP seems to behave normal, shows around 35KPA at idle.

So looks like it's not a MAP, o2, or a coolant sensor... more guesses?

[3400-95-Modified]

O2 sensor should bounce...

Whats your fuel pressure at idle? also possible to have a leaking injector?

[weba]

ALDL reads 198-203 F

dash says 60C~ (140F?)