smit2732

iTrader: (12)

I'm helping a friend tune his VE table but the car will not run with the MAF unplugged. Is this simply because the VE table is so far off or am I overlooking something? It will barely idle and the LTFT's are at around 20-25 at idle. Its a 2001 LS1 using HPtuners.
Its been awhile since I have done any tuning but I dont remember having this problem in SD mode.

any suggestions

joecar

Does it throw a MAF DTC...?

If it does then the VE table is wrong.

If it does not then it is still trying to use the MAF.

LSX Power Tuning

iTrader: (4)

Email me your tune and I'll look at it and see if you over looked anything. Email is in sig below.

smit2732

iTrader: (12)

I will send it to you tomorrow. Thanks!!

redtan

iTrader: (5)

VE is way off if you get LTFTs that high. Tune that better and it will run without the MAF as long as it's throwing the MAF codes.

danieloneil01

Is the MAF 5 or 3 wire? If 5 the IAT is built into the MAF and would explain why. If it's that far off multiply the entire VE table by 20%????? It's what I would do then I would tune part throttle and see where my upper tables would be at but I'd have it a bit richer before going ***** out WOT tuning.


You can force SD without unplugging the MAF, right?

redtan

iTrader: (5)

Yup, just fail it in the tune itself and bye bye MAF.

joecar

A MAF DTC has to show up.

smit2732

iTrader: (12)

it has a seperate IAT, doesnt throw a MAF code but I'm pretty sure the SES send is turned off. I will double check though. Thanks for the replies!!

jimmyblue

iTrader: (11)

High trims can also be from false trimming and they
can compound a rich error (like, say, a low end of VE
table that still looks stock while he tossed a lumpy-
*** narrow separation cam in there). MAF is not as
easily fooled and may be contributing to not-totally-
bogus airflow readings when in the picture.

danieloneil01

I know on my car I can't select 3 for the MAF codes as the car won't run so I have to use option 2.

joecar

You have to check with a scantool that a MAF DTC shows up immediately at startup...

without the MAF DTC, the PCM is still attempting to use the MAF.

smit2732

iTrader: (12)

Thanks for the input guys. Hopefully I will have time to play with the tune over the next few weeks.

smit2732

iTrader: (12)

Thanks for the help guys!! I just looked at the tune and the MAF DTC's were set to option 3. I set them back to 1 and will try it again,

danieloneil01

Set them to 2 not 1 and google, "hptuners VE tuning PDF" click first result.