Really need some help

[07_mustang_gt]

Working on an early 08 gt 5 speed. Progressively started running horrible. Has cams, unknown manufacturer or profile, has phaser limiters, comp cams, tuned again unknown by who or what, full exhaust no cats. Car will idle rev up drive etc but has no acceleration like its plugged up. Not detecting any misfires, cel on from p0020 been on for years with none of these issues. Some of the data I've noticed is maf reading 9.5 g/s at idle, bank 1 fuel +9, bank 2 +/-5 or so. Watched the vct duty cycle, bank 1 0% at idle and gradual moves with rpm, bank 2 0 at idle and then just straight to 100% not matching the other bank at all. Timing looked to be on. Not sure is I should just pull the phasers and replace or what please help!!!!! Thank you

 

[XJCasper]

Did the issue start after any changed to the engine or tune?

 

[07_mustang_gt]

Sorry for the late response, no car has been tuned for quite some time. Just started randomly about 2 weeks after clutch replacement, verified no pinched wires and no codes

 

[lenko]

Pinched Oxy sensor wire shorting? I had a shield around wire bent into the wire and cut it when I reinstalled the exhaust after a transmission replace. Car ran like crap till I discovered and corrected this. This shield is where the wire enters the sensor.

 

[07_mustang_gt]

All the harness wires look good to go nothing pinched. I just tore down the front cove replaced tensioners reset timing, marks are lined up as they should be. Start car still runs awful the bad thing is that it's tubed and cammed both are unknown, cannot find out what cams are in the car, all they have is a grind number that clearly doesn't exist. And nobody has information on build because I don't know the original person who did it. Today started the car checked data, notice bank is adding 38% fuel on stft bank 2 about 10-12. Maf reads 12+ at idle. Nothing is adding up. Not to mention cylinder 6 arcing noise pull coil whims running and can see sparking down under the exhaust manifold. I am completely lost

 

[DieHarder]

Were the O2 sensor cables possibly switched or damaged by mistake? We've seen that scenario several times on this forum after trans work.

 

[Juice]

"maf reading 9.5 g/s at idle" This is TWICE the value I see on all 4 of my cars, including the supercharged 5.0 fox I got. This is either a problem or your scanner is just plain wrong.

 

[07_mustang_gt]

O2 wiring good, gonna get back out there and double check this afternoon. And yea maf reading is extremely high tried a new maf same thing, not the scanner either. I'm leaving towards corrupted tune file, but have no way to verify that. Also the random #6 arcing makes no sense either. No codes as well. Last time I drove it it was like the cats were plugged no response at all.

 

[07_mustang_gt]

So update hooked up another scanner watched some data, maf still high, failed koer test p1101, upstream O2 sensors seem to be acting normal, b1s2 stays steady mid to high voltage as it should if a cat was there, b2s2 fluctuates like upstream. Still yet to find pin hed wires or any sort of technical assistance. If anyone knows of a better forum to post this for answers please let me know.

 

[Dino Dino Bambino]

The voltage from both the B1S2 and the B2S2 O2 sensors should rapidly fluctuate between about 0.05-0.95v like the upstream sensors. Therefore something's wrong with B1S2 but then it seems even B2S1 is detecting a lean condition and is adding fuel. A phaser issue could throw off the fuel trims on both banks because one bank is trying to compensate for a rich or lean condition on the other.
Therefore I think you should check the driver's side cam phaser. It's possible either the limiter hasn't been installed properly or the phaser itself has failed. A crappy tune is also possible so you might want to reach out to Lito for help.

 

[07_mustang_gt]

I got some diagrams to verify voltages this weekend. I also just redid the timing with factory phasers, everything spot on same situation, and there's no cats in the car the rear sensors are tuned out, readiness monitors show them as n/a. Bad thing about the tuning is not having a device. I have a buddy with Ford vin and diablosport might just throw my factory cams in it and return to stock minus cats. I will contact lito see if maybe he has this car on file and can tell me what tuning it has