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No start (fuel related)

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Old Jun 22, 2013 | 10:40 PM
  #1  
92RS shearn's Avatar
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Joined: Apr 2000
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From: Wichita, KS
Car: 92' RS
Engine: LO3
Transmission: Probuilt 700R4
Axle/Gears: 3.70 9-bolt
No start (fuel related)

Hello all been a long time since I posted. I don't drive my 92 much and I think thats at the heart of my problem.
I tried to start it today and it just spun and spun, no sputering or anything. The fuel in there was about a year old and has been sitting since then, so I added some heet and new fuel, same result. I took off the air cleaner and didn't see any fuel spraying as I tried to start it. In a most official test I tied a piece of cloth around the injector, tried to start it, took it off and it was dry.... hmmm.
So I unbolted the fuel line near the manifold and let the fuel pump prime. I got fuel but I am not sure how much pressure that stream should be. It was a solid stream of fuel but it did not spray like a jet nozzle or anything.

I figure either way the injectors should have been spraying something so I took them out and will go get them cleaned out. I am just hoping that is not my only issue. Does my fuel pressure description seem adequate? I don't have a gauge at my disposal.

Problem is too I am closing on a new house in just over a week so I need to get her going asap.
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Old Jun 25, 2013 | 02:01 AM
  #2  
armos's Avatar
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Re: No start (fuel related)

TBI runs fairly low fuel pressure, so it might be normal. I'd try to get a gauge to measure it though, it's a tool worth having.
You can pour/spray some fuel on the throttle body to verify that this was the only thing that kept it from running. That said, you might continue to have trouble running it on the 1yr old gas that's in the tank. There's also some risk that the old gas could clog up the pump.
If you have a noid light, try hooking that up to verify the injector is getting signaled to open while cranking. You could also try checking for voltage across the terminals with a voltmeter, but I'm not sure you'd be able to see such a short pulse. Lacking any of that, at least make sure an injector fuse hasn't blown.
The ECM won't signal the injectors if it doesn't see reference pulses from the distributor, so check those connectors also. At least that's how it is on other cars, I assume yours is the same.
Clogged injectors after sitting is common though, so that's probably what it is.
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Old Jun 25, 2013 | 03:00 PM
  #3  
92RS shearn's Avatar
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Joined: Apr 2000
Posts: 788
Likes: 0
From: Wichita, KS
Car: 92' RS
Engine: LO3
Transmission: Probuilt 700R4
Axle/Gears: 3.70 9-bolt
Re: No start (fuel related)

Thank you for your response Armos, good things for me to check. I bought a couple new injectors as I couln't find a place in town to bench clean my current ones and the dealer will only do it if the entire car is brought in. I hope to install them tonight and give it another go.
Unfortunately as I am a week from moving most of my garage has been packed up and I have no idea where many of my tools are. I couldn't find my multimeter if my life depended on it.
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