went and bought an autometer air/fuel ratio gauge and put it in, turned on car when it warmed up my hunch was right. Im running LEAN LEAN LEAN. It was BRIGHT Red indicating VERY lean..all the way at the bottom of the guage.. so now that ive narrowed it down to a fuel problem..where should i start? The fuel pressure is a steady 40psi...??!

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Slowly getting slower 1989 Firebird.. modded heavily for a v6
"I'd rather run last in a full out race, than to NOT have run at all"
#3 Forever

My Site:
Click Here to see my car!

 

Have you checked f/p with the return hose clamped off? You'll get the dead head pressure (max pressure) of the pump, which should be 60 psi. I think this test will also determine if your pressure regulator is leaking. I've heard you can also check it by pulling the vacuum line to the pressure regulator; if there's gas in the vacuum line, the diaphragm in the regulator went bad.

You're not getting any codes, right?


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-Tom P (Hot rodded 1986 Firebird 2.8l)

 

Nope..no codes. Hmm ok ill try pulling the vacuum line.. I just changed the fuel filter to be sure and it was clean gas in the old one so that was fine.

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Slowly getting slower 1989 Firebird.. modded heavily for a v6
"I'd rather run last in a full out race, than to NOT have run at all"
#3 Forever

My Site:
Click Here to see my car!

 

The vacuum hose doesnt have any gas in it... im stumped. Its running really lean on the air/fuel ratio gauge...i mean it goes really lean when idling.. then goes all over the place when your driving

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Slowly getting slower 1989 Firebird.. modded heavily for a v6
"I'd rather run last in a full out race, than to NOT have run at all"
#3 Forever

My Site:
Click Here to see my car!

 

You just passed smog, right?
Any reading to confirm what the smog test showed?
What is the idea/thinking behind this current testing?
To identify the cause of the white smoke?
When I rebuyilt/changed/swapped my fule pressure regulator, all it was was a rubber diaphram in that housing. Not much more. Shold eb easy to get one from the yard, EXCEPT you need a special torx socket, with a slight push pin in it, to remove those torx screws.
My buddy had a set of those tools. I never knew that special torx screw existed. I was informed it's a safety screw becuase of fuel pressure.

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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

 

yea i have the smog levels they are:15mph readings-co2%-14.6,02%-8.2,HC (ppm)-38,CO%-0.06,No(ppm)196;25mph readings-co2%14.5,o2%4.0,HC-23, co-0.24, no-155... BTW for So. Cal guys..this test was done with my ghetto ram air, timing advanced, no carb e.o. numbers for any mods, and a really lopey idle (no cam though) if anyone needs the address for where i got it done, email me with ur Screen name, i dont want to give info to someone not on the board if you know what i mean...

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Slowly getting slower 1989 Firebird.. modded heavily for a v6
"I'd rather run last in a full out race, than to NOT have run at all"
#3 Forever

My Site:
Click Here to see my car!

[This message has been edited by Graeme'sFirebird (edited August 18, 2001).]

 

BTW..would a fuel pressure regulator only cause a hesitation from idle? If it is the regulator, im going to get an adjustable one from a 305tpi and put that in

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Slowly getting slower 1989 Firebird.. modded heavily for a v6
"I'd rather run last in a full out race, than to NOT have run at all"
#3 Forever

My Site:
Click Here to see my car!