1993 Chevy Blazer heads?

1993 CHEVROLET BLAZER
200,000 MILES • 6 CYL • 4WD • AUTOMATIC
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SCOOTA_4
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i got a 1993 blazer, my problem is that when I try to start it, it backfires & breaks the starter bolts! I've replace the starter twice now! the timing is good still. just didn't know if i have an exhaust valve stuck, not relieving the pressure or what exactly is going on! any info/ help would be greatly appreciated!

thank

seth
Apr 25, 2009 at 6:29 PM
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PEAR69
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Does it run at all? Do a compression test on all cylinders to find a stuck exhaust valve.
Apr 25, 2009 at 9:29 PM
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SCOOTA_4
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yea it did run before this happened. But all it does now is when you go to start it it backfires, rotates backwards, & breaks the starter bolts! i haven't ran a compression test on it yet, but that was my next step!
Apr 26, 2009 at 2:11 PM
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PEAR69
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Be sure to remove the valve covers for the compression test. Inspect the valve springs. You may have a broken valve spring...a stuck lifter...or a bent valve. Keep us posted..
Apr 26, 2009 at 9:54 PM
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SCOOTA_4
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YEA, I HAD A BRAIN FART WHEN I REPLIED! I CAN'T DO A COMPRESSION TEST BECAUSE IT DOES.T RUN NOW! 1 TRY, THEN POP! ANY OTHER SUGGESTIONS, BESIDES TEARING THE HEADS OFF!
Apr 27, 2009 at 7:03 PM
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PEAR69
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Remove all the spark plugs and turn the engine by hand or crank the starter for 3 seconds to do the compression test on each cylinder. Once again - REMOVE THE VALVE COVERS AND LOOK AT THE VALVE SPRINGS. BE SURE A VALVE SPRING ISN'T BROKEN AND A LIFTER ISN'T STUCK.

BTW - You DO NOT run the engine for a compression test.
Apr 27, 2009 at 8:21 PM