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99 trans am ws6 fuel problem

This is a discussion on 99 trans am ws6 fuel problem within the General Help forums, part of the LSx Technical Help Section category; The other day I was driving my car. I parked it when I got home then when I went to ...

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    99 trans am ws6 fuel problem

    The other day I was driving my car. I parked it when I got home then when I went to leave about 2 hours later the car cranks but doesn't kick over. I can hear the fuel pump kick on and I'm getting fuel to the injectors. I sprayed starting fluid down the throttle body and it'll kick over until that burns out. HELLLPP car only has 12k miles. Put about 800 on it already this year.

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    Spaz is My Mentor SMWS6TA's Avatar
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    what's the pressure at the rails? Does it stay constant?

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    ^^ This. You should have 58 psi at the fuel rail. Almost has to be a fuel issue if it will run on ether. Has the filter been changed lately?

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    Quote Originally Posted by pajeff02 View Post
    ^^ This. You should have 58 psi at the fuel rail. Almost has to be a fuel issue if it will run on ether. Has the filter been changed lately?
    I changed the filter that day. I don't know the exact pressure but when I pressed in the valve on the injector rail it came flying out. There's a fuel line that leads from the throttle body to up and above the gas tank and that line has no fuel in it.

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    That sounds like an evaporative emissions hose -- shouldn't be any fuel going to the throttle body. You can rent a fuel pressure tester from most chain parts stores these days. When the fuel pressure falls off, our cars either become hard to start or won't start at all.

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    Quote Originally Posted by pajeff02 View Post
    That sounds like an evaporative emissions hose -- shouldn't be any fuel going to the throttle body. You can rent a fuel pressure tester from most chain parts stores these days. When the fuel pressure falls off, our cars either become hard to start or won't start at all.
    So if I get the tester and the pressure is fine then what? What does the emissions hose do?

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    Check the pressure first. Go from there after that, my $$$ is on low pressure.

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    Alright so if the pressures bad then fuel pump?

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    Fuel pump, fuel pump hose in the tank, fuel pressure regulator, in-tank fuel sock or fuel filter. That's really about it. Most people upgrade to a Racetronix pump - their kit comes with a new hose and both in-tank socks. I just installed one in our car earlier this month.

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    240$ not a bad price for everything. Ill check the pressure today. And get back to you.

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    When I replaced our Suburban pump, the dealership actually had the best price. You just have to ask for "the on-line price" if they quote you list.

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    Checked fuel pressure while priming the psi was at 58 what do I do now?

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    What does the pressure do after the pump kicks off? It should run for approximately 2 seconds when you energize the ignition. After checking that, crank the ignition and watch the pressure gauge to see what happens.

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    After it stops priming the gauge stops at 52 psi. I didn't try cranking it.

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    Ok - that is good then. It should only drop around 5 psi and hold that pressure for about a minute. So it sounds like you have fuel at the rail, but it is not getting into the engine. The engine will start if you shoot it with ether and run for a few seconds on that, right? Something must be up with the injector wire harness or fuel control circuits. Have you checked fuses and relays?

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    Yes it'll run on ether. I checked all the fuses under the hood and everything was fine.

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    Hmmm. Then the injectors must not be firing. Do you have a noid light set?

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    No I do not. What is that?

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    It is a light that plugs into the injector harness -- easy way to test and see if the signal to fire the injectors is getting to them.

    Here's an example: Autocraft Noid Light Set (6-pc) AC680: Search no more for the best Multimeters & Analyzers at Advance Auto Parts

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    Ugh great.. So I should probably just get a diagnostic reader and hook it up basically and that'll tell me what's wrong. Probably the quickest way right?

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