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04-07-2012, 10:37 AM
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#31
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Senior Member
Join Date: Apr 2008
Posts: 1,557
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Quote:
Originally Posted by Vettezuki
See attached. Should work with Google Docs or Open Office (I think) if you don't have a current Excel.
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I can open it. will see if I can find any thing..
My scan too will graph info, which makes comparing easier.
__________________
I drive a hybrid, It burns gas and rubber..
Alcohol Tobacco & Firearms should be a convenience store, not a government agency.
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04-07-2012, 11:04 AM
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#32
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Senior Member
Join Date: Jan 2010
Posts: 1,255
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It looks like your fuel trim drop to zero on both sides every now and then. That could very well be the issue. Where did you measure the fuel pressure at the rail or at the filter?
It could be the fuel regulator?
__________________
2006 CTS-V
1993 Trooper
1991 Impulse RS
1988 Trooper II SAS
1986 TrooperII (No Rear)
1988 Impulse (dead)
1983 K20
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04-07-2012, 12:14 PM
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#33
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Quote:
Originally Posted by blackax
It looks like your fuel trim drop to zero on both sides every now and then. That could very well be the issue. Where did you measure the fuel pressure at the rail or at the filter?
It could be the fuel regulator?
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At the rail.
Isn't fuel trim just an offset? IOW, when it's at zero it's no altering the default programmed values or something like that?
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04-07-2012, 12:19 PM
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#34
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Quote:
Originally Posted by jedhead
Is the fuel fresh? I had a tank of bad gas that cause my car to behave in a similar way. I had to burn through the tank, add gas treatment and burn through a second tank with gas treatment then the car ran fine.
Bob
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I do wonder if that's part of the problem. It definitely had some gas in there that was sitting for a long time.And it does *maybe* seem to be getting better with driving.
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04-07-2012, 02:03 PM
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#35
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Senior Member
Join Date: Apr 2008
Posts: 1,557
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Quote:
Originally Posted by blackax
It looks like your fuel trim drop to zero on both sides every now and then. That could very well be the issue. Where did you measure the fuel pressure at the rail or at the filter?
It could be the fuel regulator?
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Fuel trim is offset. 0 trim is neutral + or - is adding or taking away from the base 0.
__________________
I drive a hybrid, It burns gas and rubber..
Alcohol Tobacco & Firearms should be a convenience store, not a government agency.
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04-07-2012, 02:56 PM
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#36
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pain's fun, hit me again
Join Date: Sep 2009
Posts: 6,264
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Best bet is drive the car till the tank is near empty then fill with a few gallons of race fuel. Then regular, should clear out the old fuel
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Quote:
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Originally Posted by Bruce Lee
Forget about winning and losing; forget about pride and pain. Let your opponent graze your skin and you smash into his flesh; let him smash into your flesh and you fracture his bones; let him fracture your bones and you take his life. Do not be concerned with escaping safely — lay your life before him
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To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. Stopping the world!
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04-07-2012, 04:05 PM
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#37
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Senior Member
Join Date: Jun 2009
Posts: 2,509
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Can you log engine knock?? Your fuel trims are all over the place and your timing has huge dips here and there. I agree with the bad gas theory.
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93 GMC Typhoon: new money pit/PITA. Now GT3788R powered.
Boost, because sometimes atmospheric pressure just isn't enough.
"If it has tit's or tires, you can be pretty sure your going to have problems with them..."
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04-08-2012, 03:31 AM
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#38
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Quote:
Originally Posted by Shaolin Crane
Best bet is drive the car till the tank is near empty then fill with a few gallons of race fuel. Then regular, should clear out the old fuel
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What does race fuel bring to the party? I actually have a 76 station less than a mile away that has 100, but I'm not sure they turn it fast enough to be fresh.
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04-08-2012, 03:35 AM
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#39
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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On the upside it seems to have its original power back when not falling to pieces . . . I'm guess this is probably mostly the MAF. I do get a lot of spark knock on 91, but with fairly advanced timing (40 degrees) and stock manifolds and cats with crazy back pressure (3psi) on my slightly more than 11:1 comp heads, that's to be expected. This is a separate issue, but I don't want to decompress the heads with gasket or anything if I don't have to. I'm hoping some open headers/exhaust and full retune will make it work with 91.
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04-08-2012, 11:27 AM
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#40
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Senior Member
Join Date: Jun 2009
Posts: 2,509
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Maybe pick up some headers or at least pull back the timing a bit, maybe +35?
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93 GMC Typhoon: new money pit/PITA. Now GT3788R powered.
Boost, because sometimes atmospheric pressure just isn't enough.
"If it has tit's or tires, you can be pretty sure your going to have problems with them..."
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