NefMoto

Hi

OK car is back to stock while charger was being rebuilt, car has been running smoothly since the motor rebuild, saturday I decided to give the car some tlc and gave it a good wash and decided to check faults, it was moaning about the bank2 lambda probe. So I unplugged the connectors sprayed some contact cleaner in the plugs and blew them out and reconnected. took the car for a drive afterwards and now the car is missing quite badly and has started logging random miss fires to cylinders all on that bank and the plugs on that bank are now all black with soot from over fueling and the car is running terribly.

The fault is about B2 S2 which is post cat and I was under the understanding that post cat lambda wont affect fueling etc? Next question surely just unplugging cleaning at reconnecting the plug wouldnt have caused this or is it just a coincidence that it happened straight afterwards.

16684 - Random/Multiple Cylinder Misfire Detected
        P0300 - 001 - Upper Limit Exceeded
16692 - Cylinder 8 Misfire Detected
        P0308 - 001 - Upper Limit Exceeded
16542 - Oxygen (Lambda) Sensor B2 S2: Signal too High
        P0158 - 001 - Upper Limit Exceeded

CLRSHK disables post cat lambda correction.

Thanks for that Daz any chance you can give me the address in your v8 file? also does the diagnostics seem correct?

Give me your software number and I will look.

I emailed you a copy of my ols when you were looking for something in your file my file is for v8 s4 8E0910560D

somewhere around 11A0A?

or 11B4C

Thanks to Daz clrshk at 1A236 in my 8E0910560D file

set clrshk to 17 and I am still having rough running and the following error logged

16542 - Oxygen (Lambda) Sensor B2 S2: Signal too High
        P0158 - 001 - Upper Limit Exceeded

ok followed the s4wiki to remove rear o2 sensors and the lambda error is gone but the car is still running rough and I am still getting the misfires on all cylinders on that bank, maybe plugs now need to be changed after running so rich?

logs attached.

looking at the logs closely,

effinjectionontime2 has the injectors on even though the requested AFR is far below what currentafr is, also looking at a graph of effinjectionontime/2 they seem opposite, ie where bank2 is adding fuel bank1 is removing fuel..... WTH!

anybody think it could be the FPR?

checked the FPR visibly all looks good, pulled the return fuel line off of the injector rail and started the car fuel did come out the return pipe, not sure if its meant to do that at start?

Cant hear any vacuum leaks and revs dont seem fluctuate at idle.

checked all intake bolts are tight.

I am stumped!

fixed  ;D

So it was either the FPR or a vacuum leak on the pipe that goes to the vacuum reservoirs in the fender, I pushed that connector together to make sure it was tight while checking the FPR.

either of those 2 or the issue fixed itself!

Cool deal!

at least I learnt about o2 sensor removal  ;D