Question about 1997 Chevrolet S-10 Pickup

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The timing chain,cam gear and crank gear has all been replaced.the timing has been set and still the truck will not turn over,backfires once and does the same hollow noise.is this is a freewheeling engine or not.The tensioner pully broke and caused the chain to break.what else could be the problem

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  • Chevrolet Master
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It definately sounds as though you've got your cam gear set 180 degrees off.When your timing is at top dead center your crankshaft will be at TDC on the guage, the cam gear will have both of the lobes at 10:00 and 2:00 away from the surface of the valve they serve on the number one cylinder. This can only be see if the valve cover is removed, which at this point I'm sure it is. Thank you, Dana

Posted on Oct 06, 2009

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I don`t know what engine it has,but check the crank sensor to see if it was damaged,and the same with the cam sensor.It sounds like some valves are bent,but I have never heard of it happening in a s 10 pick up.Check for bent push rods also.Make sure the timing components were installed correctly.Go back over the timing chain and gear again,to make sure it is in time correctly.If it does have a disributor,it could be in 180 degrees out.This would explain it 100 percent.

Posted on Oct 06, 2009

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This is not a 0 tolerance engine if the chain broke more than likely bent some valves or push rods. You will have to remove the intake and see if you can see the valves more than likely bent. Pull the valve covers and see if anything looks broken or bent.

Posted on Oct 06, 2009

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This 2.2 L engine will bend a valve if the timing chain breaks. It just happened to mine.
To check your cam timing turn the engine over by hand untill the intake valve closes on # 1 cylinder, continue turning untill the piston is at top dead center ( remove the sparkplug and put a plastic pen or a plastic straw in the hole to find TDC.) Then the timing marks should line up if it's right.
NOTE: GM put out service bullitens about timing chain noise + breaking, check the "oil passage plug", make sure it's clear, it's hole is only .039" That's the only way the timing chain gets oil.
You can find it in the block, behind the cam gear, at 12 o'clock (just above the camshaft).

Posted on Nov 14, 2009

  • rick11934 Nov 14, 2009

    Don't forget to put in a new timing chain tensioner, and remove the pin that holds the spring in it back.

    If you don't check the timing the way I wrote, and the timing marks still line up your cam could be 180 degrees out.

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