Question about 1985 Chevrolet S-10 Blazer

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1985 chevy Blazer cranks up, runs rough, then

1985 4x4 chevy Blazer cranks up, runs rough, then shuts off. Found a bent push rod, did repairs for that plus replaced timing chain and all other things I could think of, with no luck. Blazer still starts, runs rough and shuts off.

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  • Anonymous Mar 22, 2009

    Yes, compression was checked which led to bent push rod. Engine has around 94,000 miles. Drove car, it was fine. Next time I cranked it up, wouldn't run, backfired thru carb. What am I missing?

  • mjnfl Mar 28, 2009

    Yes, did all general maintenance plus plugs and wires. Pump in gas tank is working fine,,gets plenty of gas. Thought vacuum leak, but didn't find any so far. Thanks for reply.

  • carhob May 11, 2010

    did u check compression?

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Have you checked, cady, fuel tank, is it getting the right amount of gas and air? plugs and wires, go with general mantinence first then step up. i have a 85 s10 blazer that was a lemon off the lot but has over 300000 on it and it has the same prob i fix it tempurary by flipping the lid on the breather upside down so it gets more air

Posted on Mar 28, 2009

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1 Answer

What is causing loud knocking?


If you went off the road and the snow jammed into the engine compartment look for something bent and striking when the engine is on. If you find nothing bent or broken and the noise is coming from inside the engine you may have a bent valve or connecting rod. When an engine is abruptly stopped thing can get damaged. Take a wood shaft like a broom handle and place it near the bottom of the engine when running on the block and place you hand on the end of it and then place your ear on your hand and lesion for a knock. If in the bottom could be a bent connecting rod or also called a piston rod. If noise is in the top more likely and bent valve and the engine may run rough. If you not sure have a mechanic lesion to it. You can consult your repair manual for further test. Good luck.

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Timing chain


If push rods are bent the chances are thet your thoughts are correct, your valve timing is incorrect, regards Mike

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Timing chain


bent push rods could have been caused when the chain broke and not from the chain been replaced wrong or the timing out.

if the engine was running when the chain broke the cam would have stopped leaving all the valves in the same positon as the mometum of the fly wheel continued to turn the pistons in the cylendars could hav come up and hitting the valves and bending the push rods. and or damaging the cylendar head.

recommend removing the head and have it checked for damage, as well as replacing the bent push rods, and cylendar gaskit. once the head is checked and the valves are seated well. then replace and follow instructions in the set up for the pistons and cam prior to replacing the chain and setting the timing.

I hope this was helpful.

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My 1997 chevy blazer basically, it sounds like it is miss firing runs really rough. I've replaced my plugs,wires,cap&router,fuel filter. I was told it might be fuel filter or fuel pump but i dont want...


Try checking the timing. Get a timing light, and aim at at the crank marks. If they are jumping around, your chain may have jumped a cog, and will need to be replaced. Let me know what you find out.

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