KillerZO6

iTrader: (-1)

i was wondering if 98 + f body fuel system under rate the hp if it gets to low on gas. my friend has a t/a that i borrowed last week and it seems like when its under a 1/4 of a tank that it doesn't pull as hard, it wont spin in second and the power takes longer to kick it(it a a4 car) also doesn't accelerate as fast.

RE AND CHERYL

iTrader: (31)

I remember someone else complaining that their car didn't run as well with low fuel, but I don't see why unless it was sucking up air and the fuel pressure was falling off.

Re'

KillerZO6

iTrader: (-1)

so u think it just from losing fuel pressure

RE AND CHERYL

iTrader: (31)

It couldn't be from anything else. The PCM didn't cause it as it dosn't reduce power when the fuel gets low.

Re'

DuronClocker

iTrader: (25)

I know if you had a wideband on the car, you'd start to go lean as you're low on gas. Lean enough, and you'll start to get knock and timing retard.

KillerZO6

iTrader: (-1)

i have wideband o2 on the front 2 and o2 sims on the back 2

MeentSS02

iTrader: (11)

So you are running open loop? What tuning software was used to do this?

wannabess

Could be the fuel pump getting hot if there is not enough fuel to cool it.

ChevyChad

iTrader: (50)

Don't run it less than 1/4 tank then!

KillerZO6

iTrader: (-1)

i never tuned it

MeentSS02

iTrader: (11)

Then you don't have wideband O2 sensors in the front sensor locations...they are narrowband. The PCM can't accept anything more than a narrowband O2 sensor...