This is usually something to do with the MAF sensor or the O2 sensor. One reads O2 content pre combustion and the other post. If the heater circuit is bad, it could be broken or the sensor is bad. There are three things that control your fuel trims, MAF sensor, O2 sensors and the "commanded" fuel trims input by your tuner. When I have had problems in the past, it has been related to one of these issues.

With our cars and the BAP and the how the fuel pumps work, they generally are off or on, not partially working.


What was the last thing you did to your car? Have you crawled underneath to see if you can see something? Could be a broken pigtail for the O2 sensor, exhaust leak (probably not), dirty, damaged or broken MAF (it's been explained to me that the MAF either works or it doesn't, so probably not broken), vacuum leak, bad O2 sensor or circuit leading to it.

I've gone through very similar things that you are, it is frustrating.

If you are mechanically inclined at all, you may be able to look up diagnostic methods for the various parts if JPC is not helpful. But I would guess it will be something sensor related, and easy/cheap to fix. Nothing major.

 

How would the O2 sensor affect the WOT fuel pressure? I thought the PCM runs in open loop at WOT.

 

Checked all that stuff under car looks good o2s plugged in wires look fine

Don't no car is driving me nuts don't no want else todo I ordered new o2 for bank 1 keeps coming up on scanner not ready and cat not ready also heater circuit not ready now egr popped up also

At wot on my auto meter wideband says 14.2 it use to be when car was 100% at 11.2

Can was fine till now don't no what it is

Thanks Simon I'm going to call jpc tomorrow again called on Friday they said all tech guys are busy and will call me back but they never did thanks for the help guys

 

Killercoyote - there really isn't any need for all the one sentence postings every couple of minutes. If you notice, everyone can post multiple sentences in one posting. It keeps from cluttering up the board. I've merged your posts this time.

 

Ok no problem still learning the forums buddy

 

Am I talking to myself? Pull your spark plugs, if for no other reason to make sure they are all in one piece.

 

Ok I will check the plugs tomorrow buddy sorry came out of work late I drive tractor trail let you no how they look moosestang