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Re: OT, Chevy Lumina up and died!
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Posted by KEB on April 28, 2006 at 07:41:56 from (192.31.106.34):
In Reply to: OT, Chevy Lumina up and died! posted by 1991 Lumina 3.1 on April 28, 2006 at 05:17:12:
Look in the manual, it should tell you how to connect a light bulb in place of the injectors so you can tell if the controller is trying to fire the injectors. I"ve also seen testers at auto parts chains to do the same thing - they"re basically a light bulb mounted in a connector that matches the connector on the injector. I had a 95 Chevy Astro one time that wouldn"t start unless you poured gas into the inlet, then would run perfectly once it started. Turned out to be a fitting on top of the in-tank fuel pump leaking. Found it by monitoring fuel pressure during cranking with a guage connected to the fuel rail test port. Injector pulse width is set to a fixed value during cranking, and then is determined by engine speed/load once it starts and the computer closes the control loop. In this case, there was enough pressure once it started that the computer could compensate by keeping the injectors open a little longer, but there wasn"t enough fuel pressure to start. But a cheap air conditioning pressure guage to check fuel pressure with. The fittings on the old R-12 systems are the same as the fuel rail schrader valve. Have you dumped the codes to see if the computer is showing some particular problem? Keith
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