1994 Chevy S-10 1994 S-10 fails to start after sitting

LOSTINACAR

MEMBER
1994 CHEVROLET S-10

Electrical problem
1994 Chevy S-10 6 cyl Four Wheel Drive Automatic

When attempting to restart my S-10 Blazer after it has been running, it fails to start. Engine turns over, but will not fire. The only way to get it running is to jump start it. I have replaced the battery cables, battery, starter, plugs/wires, fuel filter and the fuel pump. When jump started the vehicle runs great, radio works fine and have no other problems with the vehicle. It will restart on its own if it sits for less than 30 mins. After 30 mins it will not fire on its own unless jumped. What am I overlooking and what could possibly be wrong with this vehicle?

5 Replies

JACOBANDNICKOLAS

MECHANIC
108,170 POSTS

When it doesn't start, have you checked to see if the engine is getting spark and fuel?

Let me know.
Joe

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Tuesday, March 9th, 2010 AT 12:04 AM

LOSTINACAR

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5 POSTS

There is spark and there is fuel to the engine. There is no starting. It just turns over and will not fire until you jump start it, then will run fine until you shut it off and let it sit for 1/2 hr or so. Then the process starts all over again.

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Thursday, March 11th, 2010 AT 7:24 PM

JACOBANDNICKOLAS

MECHANIC
108,170 POSTS

If the starter is working, you have fuel and spark, it should start unless the spark is too weak or there too much or too little of fuel. Is the spark a blue snapping spark?

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Friday, March 12th, 2010 AT 7:31 AM

LOSTINACAR

MEMBER
5 POSTS

The spark is not blue hot, it does seem a little on the weak side when turning over. After jumpstarting it though the spark is nice and hot.
It will start on its own, even if you drive it. But let it sit for 30 mins or longer, you will have to jump start it to get it to run. This has been a problem for over a year now and have been unable to have any mechanics solve my problem. Getting to be a royal pain. Beginning to think this vehicle was formerly owned by Uncle Sam :)

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Friday, March 26th, 2010 AT 5:06 PM

JACOBANDNICKOLAS

MECHANIC
108,170 POSTS

If the spark is hotter when it is jumpped, there has to be a weak ground or bad connection at some point. Remember, even though you are jumping the car, it still only gets 12 volts. I would start with the basics. Check wiring around the battery, and grounds. Something isn't getting a good connection.