Printable View
Has anyone had to calculate there VE tables into the 130+'s minimum to get a good Air-Fuel reading???
My engine is a 5.3, 10.6:1 compression, decent Comp Cam, heads ported/polished, Gibson shorty headers w/crossover pipe.
I thought that this engine would breathe well but this just seems not right compared to my last LS1 that would top out at 135 VE.
Anyone have any sugestions???
I did once.... Found out it had a bad fuel pump.
For naturally aspirated I would be supsicious of any VE values over 115%. You might want to check for exaust leaks or fuel system problems (as Chad suggested)
TA your always a great help!Quote:
Originally Posted by TAQuickness
I now its not the fuel system, I have 63 PSI of rail pressure. I will check for exhaust leaks today.
Do you think it could be a intake leak?? My MAP readings are in the 45-50 KPA area and stay fairly steady.
Also, I have my wideband located at the exhaust crossover to monitor both sides of the engine. I would asume this is the best place to mount it.... Am I wrong???
Thanks guys!
Well I figured out the problem!!!!
Under DTC Processing Enablers if you disable any of the MAF tables P0101, P0102, P0103, the engine will not run correctly. You can disable them under MIL enablers but not Processing Enablers.
Hope this eventually helps someone out.
Is there a post somewhere that describes exactly what a processing enabler is? The way you word it it sounds to me like disabling the processing enabler would be the right way to do it too, not letting it be a part of the equation, but obviously the PCM doesn't like that.
To run in Speed density mode (mafless) the PCM needs to see that the maf has failed. If you turn off the processing enabler this cannot happen, and some other pseudo fuelling mode is used.
I hope you found my thread where I had the same problem. It had me stumped for about a week.Quote:
Originally Posted by RacerChris
I think this is exactly what I was going through the other day! Drove me nuts....
Lee
Another thing to note is that if youre fuel flow table isn't correct, the VE table certainly be offset.