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97 Chevy cold start problem
4x4 Chevy/GMC Trucks 4x4 Chevy/GMC Trucks Discussions (alt.autos.4x4.chevy-trucks)
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#11
 
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Re: 97 Chevy cold start problem -
10-14-2009
, 12:19 PM
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Borked Psuedo Mailed wrote: Pulled out the relay today, then plugged it back in. Turned on the ign switch, could hear fuel pump cycle, then turn off. Pulled out relay again with switch still on. Plugged it back in. Heard and felt nothing inside the relay. Also, fuel pump didn't cycle again. Could the relay be bad? The timing is controlled by the ECM, It will only cycle the relay when the key is turned off/on. That starts the timer. What I would probably do is let it set a couple days, till it won't start. Hook a fuel pressure gauge on it then turn on the key. See what you get for pressure. If you have good pressure then BUT no still no start then I would check the connection to the injector harness and stick a couple noid lights on there to see if the injectors are firing. Still no start until I pour a little gas into the throttle body. Then it fires right up and runs/starts fine all day long. Weird. This thing is driving me crazy |
48PSI with key on, no crank
40PSI during cranking.
Book says should be 55-60.
Would that slight amount of lower pressure result in a no start?
I'd hate to have to drop the tank and throw in a $300 fuel pump over a
10-15 PSI differential if that's not the problem, but nothing else is
looking good.
#12
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Steve W. wrote: Borked Psuedo Mailed wrote: Pulled out the relay today, then plugged it back in. Turned on the ign switch, could hear fuel pump cycle, then turn off. Pulled out relay again with switch still on. Plugged it back in. Heard and felt nothing inside the relay. Also, fuel pump didn't cycle again. Could the relay be bad? The timing is controlled by the ECM, It will only cycle the relay when the key is turned off/on. That starts the timer. What I would probably do is let it set a couple days, till it won't start. Hook a fuel pressure gauge on it then turn on the key. See what you get for pressure. If you have good pressure then BUT no still no start then I would check the connection to the injector harness and stick a couple noid lights on there to see if the injectors are firing. Still no start until I pour a little gas into the throttle body. Then it fires right up and runs/starts fine all day long. Weird. This thing is driving me crazy Re tested the pump this morning. 48PSI with key on, no crank 40PSI during cranking. Book says should be 55-60. Would that slight amount of lower pressure result in a no start? I'd hate to have to drop the tank and throw in a $300 fuel pump over a 10-15 PSI differential if that's not the problem, but nothing else is looking good. |
I would test the regulator and test the pressure against a dead end
first though. It is possible that the regulator is faulty and letting
the pressure drop off early.
There are a list of tests in the book. Easiest way on the pump is to
pull the line from the pump and see what it reads with a gauge on it.
When was the filter changed last?
Or you can shotgun it with a new pump and regulator.
--
Steve W.
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