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Old February 8th, 2010, 05:56 PM   #1
twelve
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S-10 starting problems

I've got an '89 s-10 4.3 liter that won't push gas out of the injectors when you turn it over. If you use starting fluid it will start right up and everything works fine. It only does it on start up. I was thinking of changing the throttle body with another one I have but I'm not sure thats the problem. Any ideas.
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Old February 8th, 2010, 07:24 PM   #2
smasheromalley
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check fuel pressure. IIRC they will run with low fuel pressure but they need a minimum in order to cold start
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Old February 8th, 2010, 07:32 PM   #3
ChevyRacer1981
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Be sure the fuel pump is even working then check the filter. doubt that the throttle body is the problem. Usually its the pump and/or filter.
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Old February 8th, 2010, 07:41 PM   #4
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Be sure the fuel pump is even working then check the filter. doubt that the throttle body is the problem. Usually its the pump and/or filter.
he knows the fuel pump is working... it runs, but wont start without help.
the question is what is the fuel pump pushing at? smasheromally is right, my moms needed 30psi to start, but that was multiport not throttle body. if it runs it is definitely not the throttle body, look into the fuel system, pump/regulator/injectors.
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Old February 8th, 2010, 09:20 PM   #5
Kodiak450r
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watch the oil pressure gauge during cranking and see how long it takes to build oil pressure. the fuel pump only runs for 2 seconds when the key is turned on then it waits for a signal from the oil pressure switch to signal that the engine is running. no oil pressure = no fuel pump.
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Old February 8th, 2010, 11:54 PM   #6
Yota Bill
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watch the oil pressure gauge during cranking and see how long it takes to build oil pressure. the fuel pump only runs for 2 seconds when the key is turned on then it waits for a signal from the oil pressure switch to signal that the engine is running. no oil pressure = no fuel pump.
that would make it start and then stall, or not continue running after he got it started...he already knows the fuel pump is working, so its not a problem with the oil pressure switch


check fuel pressure and flow rate


this is a TBI engine, correct? so what does the injector spray pattern look like while it is running?
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Old February 9th, 2010, 05:27 AM   #7
twelve
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The spray pattern is fine on the out side but drippy in the middle.
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Old February 9th, 2010, 11:16 AM   #8
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The spray pattern is fine on the out side but drippy in the middle.
Bad fuel pressure regulator.
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Old February 9th, 2010, 04:48 PM   #9
Kodiak450r
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that would make it start and then stall, or not continue running after he got it started...he already knows the fuel pump is working, so its not a problem with the oil pressure switch


check fuel pressure and flow rate


this is a TBI engine, correct? so what does the injector spray pattern look like while it is running?
i never said it was a problem with the oil pressure switch. more or less a problem with the oil pump losing it's prime causing a delay in building oil pressure causing his exact problem. i know this because it happened to my S-10 4.3 when i worked at the GM dealer and the master tech told me that was causing the problem. when your cranking at only 200 rpm the oil pump takes longer to build enough pressure to close the switch compared to running at 800 rpm as it would do when it fires up on the starting fluid.
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Old February 9th, 2010, 05:12 PM   #10
Yota Bill
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then did he also explain to you that the oil pressure switch system is bypassed while cranking to eliminate that very situation?
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Old February 10th, 2010, 07:43 AM   #11
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Well I tried the fuel filter and when I took it off. I must have twisted a line and put a hole in it. We tried to start it then the damn thing started leaking then a drop light fell off the truck and broke. The spark caught the gas on fire. It's all good though. The damage is pretty much superficial. It still holding gas but now I've gotta replace the filler tube, maybe the pump and wires and some other misc. shit. ALWAYS keep a fire extinguisher in your garage. If we hadn't have had one near us I would't be telling you this because we were trapped in there.
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