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S-10 & Blazer 1982-2005
The S-10 and Blazer was arguably the most versatile and accessorizable mid-size truck and SUV on the market.
Platform: S/T-series & GMT 330

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Old 11-08-2008, 02:16 PM
Join Date: Nov 2008
Posts: 1
Default '94 S10 won't start, just cranks

I noticed a few days ago that my truck seemed to bog down when it would shift gears. Then yesterday it won't start. It just cranks and cranks. I changed out the fuel filter but it still won't start. I also checked for spark in one cylinder and it does spark.

It's the 6cyl TBI.

Any help will be appreciated.

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Old 11-20-2008, 12:51 PM
Join Date: Mar 2008
Posts: 8
Default RE: '94 S10 won't start, just cranks

My '94 Is doing the same thing!! I know I am getting fuel, not sure about spark yet. I recently replaced the fuel pump, fuel filter, spark plugs, and air filter. My assumption is that I may have a weak coil pack. Let me know what you come with, seeming as I still have a truck that wont start!
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Old 01-02-2009, 02:40 PM
Join Date: Jan 2009
Posts: 4
Default RE: '94 S10 won't start, just cranks

Not sure if you fixed the problem but i just bought a 94' s10 pickup and it had a bad fuel pump which made it only crank over and over, when i was replacing the fuel pump i decided to make sure it wasn't the fuel pump relay so i disconnected the fuel lines from the top of the fuel tank so i could see if it was pumping fuel, i then replaced the lines and tried starting it, it ran very rough and sputtering just like most on here have doing, so i replaced the pump and it fired up perfectly, now i just need to resolve my overheating problem, good luck.
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Old 01-27-2009, 10:34 PM
Junior Member
Join Date: Jan 2009
Posts: 3

I have a 94 blazer as well. Mine runs but with issues that I am constantly working on. My grandfather was a mechanic his entire life and tought me one thing from the get. Spark, Compression, Fuel, that is a little check list. A common problem on the 4.3 is the 2 fuel lines inside the upper plenum they crack and cause idle issues at first then issues through the entire rpm range. To see if they are ok the you need to take the upper plenum off and if the right side of the lower plenum is clean that is it. If your left side is clean then it is the fuel regulator. Also if you turn the key to the on positon then you can look to see if anything is leaking. I would check this out first as this seems to be the issue with those motors and the only issue. They run forever as long as you give them fuel.
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Old 01-27-2009, 10:34 PM

94, 94s10, chevy, crank, cut, forever, fuel, problems, pump, regulator, s10, sonoma, start, turns, wont

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