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04-22-2014, 11:08 AM | #1 | |
AF Regular
Join Date: Sep 2007
Location: Mountain View, Wyoming
Posts: 110
Thanks: 13
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intermittent starting problems
I am working on a 1995 S10 Blazer. it has a 4.3l vortex. The vehicle runs good. The problem is when it is shut off at end of day. Then the next morning it will not start. Then at a different time in the same morning it will start and run all day. I have fiddled with it when it will not start. It acts like it wants to fire but will not start. If I am persistent with it and crank and pump the hell out of it eventually it will start. I have checked the fuel pressure when it will not start and it is good. There is also spark. I don't know what to check next. I has been cold when it does this. Any ideas what to look at?
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04-22-2014, 11:39 AM | #2 | |
AF Enthusiast
Join Date: Dec 2001
Location: clarksville, Tennessee
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Re: intermittent starting problems
Next time. Try some starting fluid. If it fires up, fuel delivery issue. if not, suspect ignition.
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04-22-2014, 10:14 PM | #3 | |
AF Newbie
Join Date: Dec 2011
Location: Thomaston, Maine
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Re: intermittent starting problems
check the ignition module/coil? if it has a crack & gets moisture it it they become weak... weak spark. next bet is to check the compression on all cylinders.. cold should be around 90-100PSI. another possible may be a bad ground strap from the block to the battery/body. have you checked the CPS? a bad Cps will allow a vehicle to run, but when it gets hot it will refuse to run correctly with differing information coming from the CPS & camshaft sensor. there are voltmeter tests out there to run on these..
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