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Old May 1st, 2007, 08:14 PM   #1
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Default 4.3 won't start

I am currently putting a 4.3L in my jeep and have had it running good but the other day I ran it and heard a pssst sound and stalled. I have heard that these are prone to intake gasket failure so I replaced it. I changed my oil also to find it half water. Ouch. Now it still will not start. It turns over but will not fire. What am I missing? It also seems really loud trying to start, I assumed at first that it was the water washing oil off the cylinder walls so I injected oil in each plug hole. Still no start and still sounds loud. Also, the intake gaskets did not look to bad, is there something else that I should be looking for?

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Old May 1st, 2007, 08:23 PM   #2
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I know u said it was noisey but do u have spark and fuel?
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Old May 2nd, 2007, 11:50 AM   #3
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Yes. I checked spark and it looks great. When I go to start it I can hear the fuel pump run till it builds pressure in the lines so I am assuming that I have fuel. I also sprayed starter fluid in the intake and it does not fire on it which seams odd since I have spark. The engine is out of a 1999 Chevy silverado.
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Old May 2nd, 2007, 08:20 PM   #4
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check the EGR valve to be plugged I know it will run rough with it plugged but u never know
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Old May 2nd, 2007, 08:31 PM   #5
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I am currently putting a 4.3L in my jeep and have had it running good but the other day I ran it and heard a pssst sound and stalled. I have heard that these are prone to intake gasket failure so I replaced it. I changed my oil also to find it half water. Ouch. Now it still will not start. It turns over but will not fire. What am I missing? It also seems really loud trying to start, I assumed at first that it was the water washing oil off the cylinder walls so I injected oil in each plug hole. Still no start and still sounds loud. Also, the intake gaskets did not look to bad, is there something else that I should be looking for?

Thanks
I am wondering if you took out the crank sensor. it could very well have gone bad with the introduction of water into it. if you can find a data reader and see if your getting a signal. second thing would be the source of your water. the older 4.3 used to leak from the lifter vally walls. use a good block sealer to close any pin holes. the other BIG problem that 4.3 has is the rear most head bolts would stretch or break. that causes water to leak in to the rear most cylinders. most likely the right side because it runs hotter then the left.
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Old May 2nd, 2007, 08:32 PM   #6
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Vacuum lines?
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Old May 2nd, 2007, 09:00 PM   #7
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Thanks for the help guys. I actually have a scanner the problem is I don't have that part of the wire harness to plug into. I will check your suggestions. I am also thinking when I pulled the distributor for taking out the intake that maybe I turned it when I put it back in (throwing timing way off). I will let you know what I find.
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Old May 3rd, 2007, 05:48 AM   #8
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It has a distributor? I thought those were all gone by then?
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Old May 3rd, 2007, 08:53 AM   #9
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Yahoo, I got it. I was tracing hoses yesterday to see if there was a leak and found a hidden bolt that I took off when I pulled the intake off, on the bolt was a ground wire. I hooked it back up and away she went. I am thinking the ground wire must be for the injectors because I know I had spark, and I had fuel. I guess it could be power for the pcm also. Anyways it is running, thanks for the help.

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It has a distributor? I thought those were all gone by then?
Yes it does have a distributor on the back side by the firewall. The V-8's (4.8 and 5.3) have individual coils for each cylinder but the 4.3 has one coil with a distributor.
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Old May 3rd, 2007, 11:26 AM   #10
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Well I'm glad my suggestion of checking vacuum lines indirectly led you to the problem!
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Old May 3rd, 2007, 05:58 PM   #11
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Well I'm glad my suggestion of checking vacuum lines indirectly led you to the problem!
Not as glad as I am, I have been chasing this problem for almost a month. Thanks
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