Help odd STFT issues
Help odd STFT issues Ok so here is the full story. The car is a 01 Firehawk. Forged 347 PT88 turbo and a Th400. 2 bar OS and 80lb injectors.
I have had the car up and running like this for about 4 months now and have been slowly fine tuning the car. I have been running with no O2 sensors because I have having some minor issues.
So the big Problem comes after a trip to the track last week. I ended up tossing my Alternator belt during my pass and Drove back to the pits and loaded the car up to go home. It did kill the battery. I bought the car home and charged the battery back up and replaced the belt.
Now. the car starts up and idles great. But as soon as I start driving the car my STFT go like +50 and the car goes 10.0AFR. stop driving and let it idle goes back to nice 14.7AFR. This is all with my O2 sensors disconneted
If I plug the O2 sensors in STFTs go -50 and the car goes Very lean.
I have gone in to the tune and disables LTFT and STFT and it still does this. I have gone in with the scanner and reset fuel trims.
Before the trip the the track the car was fine no issues all I know it I lost my belt and this happened.
I have taken the belt back off the car and it still does this so I know its not the alternator causing wierd issues. I have also looked to see that I have no chaffed or rubbed wires. I tihkn my next step is to remove the O2 sensor wires from the PCM connectors .
I have attached a copy of my tune and log of it acting up
Edit ok for some reason Ls1 tech will not let me post my config file PM me if you want me to send you the file
I have had the car up and running like this for about 4 months now and have been slowly fine tuning the car. I have been running with no O2 sensors because I have having some minor issues.
So the big Problem comes after a trip to the track last week. I ended up tossing my Alternator belt during my pass and Drove back to the pits and loaded the car up to go home. It did kill the battery. I bought the car home and charged the battery back up and replaced the belt.
Now. the car starts up and idles great. But as soon as I start driving the car my STFT go like +50 and the car goes 10.0AFR. stop driving and let it idle goes back to nice 14.7AFR. This is all with my O2 sensors disconneted
If I plug the O2 sensors in STFTs go -50 and the car goes Very lean.
I have gone in to the tune and disables LTFT and STFT and it still does this. I have gone in with the scanner and reset fuel trims.
Before the trip the the track the car was fine no issues all I know it I lost my belt and this happened.
I have taken the belt back off the car and it still does this so I know its not the alternator causing wierd issues. I have also looked to see that I have no chaffed or rubbed wires. I tihkn my next step is to remove the O2 sensor wires from the PCM connectors .
I have attached a copy of my tune and log of it acting up
Edit ok for some reason Ls1 tech will not let me post my config file PM me if you want me to send you the file
Put it in open loop, and see what the A/F does....
Don't disconnected sensors force the pcm to limp mode? Have you gone thru the procedure for eliminating them, just not unplugging them?
Don't disconnected sensors force the pcm to limp mode? Have you gone thru the procedure for eliminating them, just not unplugging them?
Everyone on the HPT forum thinks I don't have my MAF codes tuned out properly so I am gonna change that and see what happens.
AIRC, if they are disabled and you plug them in, you should get no "reaction".
Tuning them out does not include unplugging them.
However, if they are unplugged, and have been driven for considerable time w/o the heaters operating, they may well be fried....
If they are in fact, still operating, and have been plugged into the opposite side of the harness..you will get funky results.
FUN, ain't it!!
Tuning them out does not include unplugging them.
However, if they are unplugged, and have been driven for considerable time w/o the heaters operating, they may well be fried....
If they are in fact, still operating, and have been plugged into the opposite side of the harness..you will get funky results.
FUN, ain't it!!
You do not have STFTs disabled in the file that you posted. They are very much active.
DBC cars do not have limp mode. Having them unplugged simply forces OL.
DBC cars do not have limp mode. Having them unplugged simply forces OL.
Last edited by Frost; Jul 21, 2011 at 04:51 PM. Reason: fixed typo
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I just looked at the log... The reason the trims are running aggressively is that the sensors are showing 0mV. You should see 447mV (bias) with them unplugged. This looks the same to the PCM as having them hooked up to the harness but hanging in outside air.
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Verdad Gallardo Ok Any thoughts on what might cause this issue? bad ground or something. I am hoping not a PCM issues I have put too many in this car already.
1st PCM lost an IAC driver.
2nd I got wet inside and fried.
I sure hope this one isn't toast
Edit I think I will back the terminals out of the PCM first to make sure I don't have a wiring issue first
1st PCM lost an IAC driver.
2nd I got wet inside and fried.
I sure hope this one isn't toast
Edit I think I will back the terminals out of the PCM first to make sure I don't have a wiring issue first
