Error in my tune-$100 to find it for someone

[LS1_Dragster]

Also, put B3702 and B3703 to my numbers, I proved this to reduce my et considerably on 2 occasions. It will also change your AFR at idle. Again, raise A0008 to what ever your car likes warming up.

[swingtan]

I had already guessed it was running timing based on the b5912 table at WOT but can't find anything that triggers it. I assume massive air flow is doing it but can't find anything to change and stop it. Car has a full set of Autometer guages to monitor things. I try to stay on top of DTC's, just can't do anything with PO102 MAF code, won't run without it.

The P0102 code is needed to force the PCM into SD mode. It's fine to leave that DTC alone as it'll come back every time you start the car. If you disable the DTC, the PCM won't know that the MAF has failed and will still try to use it for air flow measurements. If it's not there, then the "measured" sir flow will be "0" and the PCM will cut the fuel.

The Oil DTC's however probably should be set to work though. They should capture any oil pressure changes and set an error code to suit. The other way would be to simply log engine oil pressure all the as there is always a chance that you could miss a sudden drop in oil pressure while watching the road. I'm also not sure if the PCM will act on a low oil pressure trigger even if the DTC is not set.

You may be right with the air flow settings, as the increase in air flow may be triggering "limp home mode". Again, this should set a DTC and the air flow DTC's do appear to be turned on.

Actually, I did notice that the Engine Protection timing comes in at 4,000 RPM and stays there all the way up. It only changes as you approach the 4,000 RPM mark again. I wonder if B0120 has an effect on this? Given you are running SD and it shouldn't make any difference, I'd set this to say 7,500 RPM or 400 RPM and see what happens ( actually, I'd do both and see if there is any difference ). I wonder if the PCM is still calculating AIR flow and as you cross the 4,000 point, it drops into protection mode.

Simon.

[vxchev8]

In power enrichment mode you are commanding 14.63. Only skipped through the thread, sorry if it has already been mentioned.

[Cablebandit]

24 degrees is what it shows for protection mode so i would guess oil pressure sending unit...and like was also said you are asking for 14.63 afr in PE mode

[LS1_Dragster]

He was in SD mode so the PE isnt being used, it's using B3605 to command WOT AFR.

[LS1_Dragster]

Any updates?

[67SS509]

Any updates?

Had to give it a rest for the weekend. This problem has about burned me out. Went racing last night. The competion is getting so fast. 3.9x secs. in the 1/8 mile, stock suspension cars in the 4's, next they will be going to the moon

I'll be back on it tomorrow and will post the results.

[SSpdDmon]

He was in SD mode so the PE isnt being used, it's using B3605 to command WOT AFR.

Even in SD, the PCM will take the richer value of either the PE or Commanded AFR in Open Loop tables when the PE thresholds are met. This is true because I tune a little different from what the tutorial suggests by setting my OL table to 14.6:1 across the board once the engine is up to temp (i.e. all columns=14.6:1 when ECT >160*F) and my PE to the values I desire for WOT. This simulates how the car performs from the factory in closed loop operation....commanding 14.6:1 until PE kicks in.

[LS1_Dragster]

I can see the benefit of doing that unless you are using a custom OS...

[67SS509]

Finally got to make a run this evening. The problem is still bad as ever. Log is attached.

Started removing the fuel tank to try something different on the sump. Engineer at Aeromotive thinks it's got a big pressure drop on the suction side of the pump. That's causing flashed fuel (call it air bubbles) getting to the injectors. I'll post updates on this. Probably will take a few days to try something.