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Old 06-16-2013, 07:19 AM
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1989 Chevy S10 wont start

hello guys i really need help...im new at working on my troubleshooting and im lost...I was driving my s10 turned it off 10mins later it wouldnt start....i took off breather it started after a bit...got down the road a mile or so it was blowing alittle smoke out tail pipe and it started overheating and oil tac was jumping hi and low....i shut her down..now it wont start and back fires a bit..getting fuel and spark ...i took out all spark plugs 1 at a time put my thumb over hole felt try to blow my finger off..got new plug change oil and all filters...still wont start its hitting.... is it my timing chain or head gasket or what

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Old 06-16-2013, 07:26 AM
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f.y.i

its a 2.5 4 cyl engine 5 speed trans. my brother tryed cleaning my air filter with water and didnt let it dry i guess..there was alittle sludge in valve cover but not when i drained oil.
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Old 06-16-2013, 08:57 AM
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By saying "oil tac" I think you mean oil pressure gauge.
If the gauge is jumping all over the place , the oil pressure switch could have a problem. Or your engine is losing oil pressure.
The oil pressure sending unit is probably also the switch for the fuel pump. That may be your cause to the stalling -non start .
Next time the trucks shuts off, check the basics, check for spar at the plugs, and look down the throttle body to see if fuel is spraying in.
That should help narrow it down.
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Old 06-16-2013, 09:27 AM
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its not starting now..getting spark and gas.. ya the oil gauge is jumping low and high
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Old 06-16-2013, 09:31 AM
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it overheated and the oil gauge was jumpin i shut it off now it wont start
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Old 06-16-2013, 09:32 AM
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it was running ok before that
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Old 06-16-2013, 10:39 AM
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You might want to do a compression test(cold will be ok).
I've seen overheated engines exhaust valves seize in the valve guides, and not seal. Could also be a blown head gasket, or piston rings sticking.
Not saying thats what it is, but if you have fuel and spark a compression test is a good next step to solving your problem IMO.
FWIW,
ssmonty
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Old 06-16-2013, 10:47 AM
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Quote:
Originally Posted by 1989 chevy s10 View Post
its not starting now..getting spark and gas.. ya the oil gauge is jumping low and high

How did you verify that it is "getting Gas" ?
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Old 06-16-2013, 07:58 PM
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i got water coming out of tail pipe...thank it the head gasket from overheating...i took fuel line off and hit key shot everwhere....had my father in law come push start me it fired and took off but died fast
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Old 06-16-2013, 08:17 PM
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what all will need replaced when i get in there to change head gasket??? and how will i know what else is bad..how do i check valves and piston ring...ive never took apart a head before...ive only done basic parts that are pretty simple..i hear its not easy
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Old 06-17-2013, 09:30 AM
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In order to check your valves you will need to take the head apart and that is pretty simple if you have the right tools. You will need a valve spring compressor in order to get the springs off and check the valves. I am no expert on checking things but do have some knowledge you will need to have a dial indicator in order to check for guide clearance and do what is called lapping the valves which you use a valve lapping compound in order to check the valve sealing margin line on the valves themselves. In order to check to see if your piston rings are sealing you will have to have the whole engine together with the new head gaskets and everything in order to check the psi pressure for each cylinder but after all that I would just take the engine apart and do a rebuild with new bearings and a new rering job and deglaze the cylinders. I am sure more experienced guys on here will post more info. The valves will have to be sealing good as well or it could show a low cylinder pressure I am guessing if it would happen to leak. A leak down test is good to do as well.
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