Fuel pressure at startup? Cold start problem

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04-02-2005, 04:10 PM

75/92 Birdman

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Car: 1998 Trans Am, 1992 Firebird

Engine: 402 LS2 stroker, 355 SBC

Transmission: T56 in both

Axle/Gears: 4.10 gear Moser 9", 3.27 9-bolt

Fuel pressure at startup? Cold start problem

OK, I'm having cold start problems with our car. It is a 87 L98 in a 92 Firebird. It has a cam in it a little bigger than a ZZ4 cam. Once you get it running, it is great. Just getting it started is the problem, we have to use some starting fluid to get it going.

I'm only seeing 20lbs of pressure at startup. Haven't checked yet while running, but that seems like it is too low for startup.

Is this too low and what should it be? I'm stumped, I'm a carb guy at heart so no idea here.

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04-03-2005, 01:23 PM

75/92 Birdman

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Car: 1998 Trans Am, 1992 Firebird

Engine: 402 LS2 stroker, 355 SBC

Transmission: T56 in both

Axle/Gears: 4.10 gear Moser 9", 3.27 9-bolt

OK, got it figured out. Starts right up now, but it has the wrong tune on it now and is getting waaaay to much fuel.

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04-03-2005, 02:25 PM

doc

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Car: '87 IROCZ

Engine: 395 ZZ4

Transmission: ProBuilt 700R4

Axle/Gears: 9 bolt 3.70s

So what is the fuel pressure? And why do you think its getting too much fuel now?

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04-03-2005, 03:46 PM

rgarcia63

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Car: 88' IROCZ

Engine: 388 TPI Motown 350 Race block

Transmission: 700R4

Axle/Gears: 2.77

Quote:

Originally posted by 75/92 Birdman
OK, got it figured out. Starts right up now, but it has the wrong tune on it now and is getting waaaay to much fuel.

figured out = ?

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04-03-2005, 03:51 PM

75/92 Birdman

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Car: 1998 Trans Am, 1992 Firebird

Engine: 402 LS2 stroker, 355 SBC

Transmission: T56 in both

Axle/Gears: 4.10 gear Moser 9", 3.27 9-bolt

Well, if I bump it up to 40lbs it blows smoke that smells like unburnt fuel and sounds like the engine is flooding.

Well, if you know the **** we went through with this car, any time we find what the problem is it is figured out.

Talked with Jeff at CAM that is doing the tuning, he said to bring it back and he'll retune it to work with the higher fuel pressure - problem solved.