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95 4.3L Blazer won't start when warm.


jagnich
11-26-2007, 01:26 PM
I've got a 1995 Blazer with the 4.3L vortec and it has developed a strange problem. It will start fine in the morning (cold), runs fine. I can shut it off for 5 minutes or so and it will restart fine, but if I let it sit for 30-45 min it won't restart. Engine turns over great but won't even try to start. If I wait 2-3 hours it will start right up instantly. I pulled a plug wire and it is getting spark and I can hear the fuel pump running when I turn the key on, just won't start unless I let it sit for a few hours. Any suggestions?

Thanks,
Jason

old_master
11-26-2007, 02:38 PM
Check for a blue, not orange, spark at more than one spark plug. Also check fuel pressure, must be a minimum of 60psi.

jagnich
12-09-2007, 11:38 AM
Sorry it took so long, here's an update:

I changed the plugs, wires, cap and rotor. They needed it. Checked the spark again and it was a little orange, so I changed the coil, nice blue spark now. Fuel pressure is 61-62 when you turn the key on and stays straight at 6o when cranking the engine. Still won't start hot.
Had the codes scanned and they came back with leaking gas cap and a vacuum leak.
On a suggestion from some one, I sprayed some starting fluid in and it fired off. Would run as long as I was spraying it thenit would die and not start until the engine cooled.
Suggestions?
I have been told that it might be the injector or maybe the egr valve is stuck open or not closing properly. Anyway I can tell the difference without just throwing parts at it? Or is it something else?

Thanks for the help guys!
Jason

old_master
12-09-2007, 11:52 AM
Sounds like excessive leak down after the pump shuts off. Must remain above 55psi for 3 to 5 minutes.

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