Timing problem - Team Camaro Tech
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post #1 of 5 (permalink) Old Aug 25th, 03, 03:12 PM Thread Starter
 
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My 1968 Camaro has suddenly developed, what I think is a timing problem. The car backfires through both the carburator and exhaust at any engine speed. The timing, with the vacuum advance disconected and plugged is 4 degrees BTDC. With the vacuum advance it is at about 20 degrees BTDC at an idle. With or without the vacuum advance, the engine backfires to the point of being essentially undriveable. Until this started, the car drove well. Any suggestions?
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post #2 of 5 (permalink) Old Aug 25th, 03, 03:43 PM
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Sorry, sounds like a cam going flat. See if everything else checks out O.K. and then maybe do a compression check. Look at the plugs, they will say a lot.

-Mark.
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post #3 of 5 (permalink) Old Aug 25th, 03, 06:27 PM
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Might want to look for a broken valve spring/springs, bent push rods or broken rocker arms. Some of these migh be a giveaway if it's running rough or has a ticking/knocking sound. Doing a compression check as Mark stated is going to tell you alot about what's going on. If you can't find anything else i would start there.

Joe

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post #4 of 5 (permalink) Old Aug 26th, 03, 05:45 AM
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I had the same symptoms after gassing it a little too hard last week. It sounded like the distributor moved and the timing in my 68 - 350 was off. It backfired through the carb and out the exhaust. After checking the distributor, we used a long screw driver to listen to each cylinder and heard problems with #4. We pulled the intake manifold, shined a light into the cylinder and couldn't see anything out of place. Then we pulled the head and found the gasket let go between #4 and #6. Good luck - hope it isn't something expensive.

Tom

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post #5 of 5 (permalink) Old Aug 26th, 03, 06:21 AM Thread Starter
 
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Thanks for the ideas. Since the engine is making no unusual noise, I hope is is something "simple" like a flat cam or blown head gasket. This engine was supposedly re-built by the previous owner about 4000 miles ago. Oh well.
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