2000 Jimmy 4.3 vortec no start please help - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-20-2014, 02:16 PM   #1
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Default 2000 Jimmy 4.3 vortec no start please help

So to start the truck just cranks with no attempt to start, I have checked spark in 3 cylinders and there is spark (the plugs are sparking but they are old), I replaced the fuel filter just because (12$) and that changed nothing, the fuel pump is fairly loud when turning the ignition to the on position I am thinking it may be weak? I am going to test the fuel pressure at the point next to the distributor pack today I just have to go borrow the kit from autozone. does anyone know what pressure it should be at that spot? do I just crank and watch or is there a different procedure? anybody have any ideas? I tried sparaying fuel directly into the tb and it still didn't even try to start.
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Old 02-20-2014, 02:29 PM   #2
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there lots of common fuel issues on those, fuel pressure is one of the first things i check on cpi. key on engine off is like high 50'* and if it comes up but fades away its a regulator or leak in the plentum area with the poppets or regulator. if it only comes to less than 50 its more likely a pump. just because you hear it doesnt mean its good anymore, they are very pressure sensitive and will do all kinds of crazy stuff if it doesnt have the right pressure all the time
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Old 02-20-2014, 04:47 PM   #3
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This will be the best 50 bucks you will ever spend if you want to work on your own car.
http://m.oreillyauto.com/mt/www.orei...0665&ppt=C0103
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Old 02-20-2014, 07:07 PM   #4
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Quote:
Originally Posted by 75 racer View Post
This will be the best 50 bucks you will ever spend if you want to work on your own car.
http://m.oreillyauto.com/mt/www.orei...0665&ppt=C0103

I will buy one in the next couple weeks just can't afford it right now but your defiantly right can't believe I don't have one yet and I have tons of useless crap

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Old 02-20-2014, 09:57 PM   #5
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So key on it goes straight to 55-56 psi then slowly starts fading in a few min it'* around 45psi any ideas. I would expect that to be enough to at least try to start
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Old 02-20-2014, 11:26 PM   #6
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Pressure is low, needs 60 psi to pop the injectors open. Hows the fuel filter?
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Old 02-20-2014, 11:29 PM   #7
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Pressure is low, needs 60 psi to pop the injectors open. Hows the fuel filter?
Filter is brand new! Plugs aren't even getting wet. Where did you get that spec 60 psi to open the injectors? Could the pippets or regulator be leaking into the intake the oil has a very light smell of gas in it.
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Old 02-21-2014, 12:06 AM   #8
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The pressure goes down slowly after key off its not rapid. I have seen a couple other threads state there should be 60-67 psi to run I feel like the pump is bad and that'* why there isn't any fuel hitting the cylinders. Also think the regulator could be bad
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Old 02-21-2014, 12:08 AM   #9
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#1 reason is fuel pump. #2 reason is defective ignition switch. Both huge high failure items preventing starting on a S10, Blazer, Bravada, Jimmy, Sonoma.
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Old 02-21-2014, 12:11 AM   #10
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What would the ignition switch symptoms be?
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