? about stock fuel system

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Nov 14, 2007 | 12:29 PM

KillerZO6

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? about stock fuel system

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.

Nov 26, 2007 | 10:00 PM

RE AND CHERYL

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From: Dover DE

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.

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Dec 10, 2007 | 11:23 AM

KillerZO6

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so u think it just from losing fuel pressure

Dec 10, 2007 | 09:55 PM

RE AND CHERYL

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From: Dover DE

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

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Dec 10, 2007 | 10:01 PM

DuronClocker

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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.

Dec 10, 2007 | 10:13 PM

KillerZO6

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

Dec 10, 2007 | 10:55 PM

MeentSS02

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From: Dayton, OH

Quote:

Originally Posted by KillerZO6

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

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

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Dec 11, 2007 | 09:57 AM

ChevyChad

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

Dec 11, 2007 | 10:21 PM

#10

KillerZO6

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i never tuned it

Dec 12, 2007 | 09:03 AM

#11

MeentSS02

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From: Dayton, OH

Quote:

Originally Posted by KillerZO6

i never tuned it

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...