Question about 1991 Pontiac Grand Am

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How do I know if the timing chain is broke. My 1997 blazer 4.3 motor turns over like is has no compression. Is this the timing chain. I have no fire at the plug wire either

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  • Pontiac Master
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Good chance it's chain. A compression test is usually pretty reliable for confirming.

Posted on Mar 09, 2009

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1 Answer

Car not firing


Most likely the valves were bent.
When you attempt to start the motor does it turns over a bit fast and will not sound quit right - Not even attempt to spark up or fire up.
Check engine cylinder compression. The valves were bent when the belt broke.
you will
1. check compression (and when it fails)
2. decide to have the head checked and if possible rebuilt (use new head bolts)
or
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or
4. Look for a rebuilt head

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My 1997 jetta vr6 glx does not have spark in number 3 and 4 at the coil. changed the coil and the ecm, still no spark at coil. whats going on?


Check to see if the cam position sensor or the crank position sensor is misaligned or has a corroded connector plug. The ECM needs to get a firing pulse from all cylinders. If the engine is a dual cam and is not attempting to start, some engines have a timing device (chain) for each bank. If the chain broke on one bank, the cam sensor can not possibly fire because the cam is not turning.

Aug 14, 2012 | Volkswagen Jetta Cars & Trucks

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My Blazer will turn over, but won't start. Engine locked up when I was driving it and it died. No Knocking, has frequent oil changes. All fluids full in vehicle, no blown fuses. Truck seems to shake...


If the timing chain jumped or broke you will have no or low compression. Is there spark at the coil? If so is there spark at 2 or more cylinders at the spark plug? Can you here the fuel pump come on when you first turn on the key? Distributor cap and rotor is very common with that Flat cap.

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When i stopped the 1997 suburban 1500 it was running fine. i tried to start it 2 days later and it wont start. it sounds like the engine is fighting itself. it cranks then stops then cranke a little but...


check the timing and compression as this is a typical chevy senario, runs good it seems and shut off and now fights and locks up. Pull #1 plug, put into wire again and rest on exhaust manifold so electrode is very near metal, this will cause a spark. now put finger in the plug hole and crank motor, does the plug spark at the same time finger gets pushed off plug hole (compression) ? Also you can bring #1 cylinder to top ,(compression ) and remove dist cap, where the tab on rotor aims is it aiming to the plug wire in the cap that goes to the #1 spark plug. If any of this is not in line then the timing is off and you have to check. 1) timing chain and gear, 2) distributer gear on the bottom of dist which messhes with cam gear, (you can check this with cap off and try to spin or turn by hand.) And the most severe case is the cam broke, after all other checks you can pull off a valve cover and turn motor over and check all lifters for open close movement. I hope i didn't scare you . AND i also wish the easiest fix for you as well.

Jan 17, 2011 | 1997 Chevrolet Suburban

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I have a 1997 GMC Jimmy, 4.3 v6, i have replaced timing chain


fuel pressure regulator it is located on the spider pump behind the throttle body

Feb 13, 2010 | 1997 GMC Jimmy

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Truck cranks but wont start, i have fuel and fire. i changed ditrubutor cap and rotor. some help please


Check to see if the timing chain broke, take out the spark plugs and do a compression test. You can turn it over with the starter and hear and feel the compression coming out of the spark plug holes instead of using a compression gauge. That should tell you if the chain broke.
Or you can lift the rocker cover to see if the rockers move when you turn it over.

Feb 02, 2010 | 1997 Chevrolet S-10 Pickup

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My 97 nissan pickup 4 cylinder is rolling over just wont fire like its not getting a spark or not getting any gas.what can i do?


The KA24E motor in these trucks does NOT use a belt for timing. It has a chain and although I have not had one break, the guides wear out and cause wear into the cover from slapping that will cause a coolant leak into the engine oil. While that should be checked, and could have jumped a tooth, I doubt thats the problem. If the starter sounds like there is no load, and the engine is spining freely, then you lost compression and I would check the timing chain. If it sounds the same when cranking but no fire, I would check spark - hold a wire close to a bolt on the engine and see if a spark jumps while cranking. If it does then it might be a fuel problem - spray some carb cleaner into the throttle body and see if it fires over for a second. then you will have eliminated the basic cause - fuel or spark?. No spark could be anything from coil to distributor module to computer or a wire in between. I would also take the dist. cap off and make sure the cap is ok and the rotor is still attatched to the dist. If the chain broke or jumped a tooth or 2, it most likely caused valve damage. This is an "interference" motor.

Jan 18, 2010 | 1997 Nissan Pickup

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I have a 1998 Chevy Blazer 4.3 Vortech that will not start.


You may want to check your fuel regulator and check your injectors. Had the same issue with a 96 and replaced the whole CSFI spider assembly with a MFI spider assembly and problem was solved.

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I need to know a which part my car has?


possably it has a timing chain, best to ask a main dealer

Jun 10, 2009 | 1997 Chevrolet Blazer

2 Answers

Very low compression


Check timing belt/chain for proper alignment.

Jun 02, 2009 | 1997 Toyota Camry

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