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Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

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post #1 of (permalink) Old 06-15-2014, 11:12 PM Thread Starter
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Looking to get the jeep going again but I need some help tuning it up. It has been sitting in the driveway and has not had much of a chance to get it some exercise.
it runs now but starting at 2K RPMs it will start popping thru the exhaust. what is causing that?
is there a step by step guide on doing tune ups?
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post #2 of (permalink) Old 06-16-2014, 07:47 AM
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Is it very short on power too? Your 304 engine is notorious for jumping the timing chain a tooth, which is a common cause for your malady. When that happens the ignition timing will be off, so a timing light will confirm the diagnosis. There's no other likely cause for the timing to be off.

As for a guide to the process, the only things normally done in a tuneup on that engine are spark plug replacement, and checking the ignition components and filters. If the spark plug wires are cracked or the cap or rotor is burned they need to be replaced. A good check is to look for arcing around the cap and wires with the engine running in total darkness.

The carburetor might need a rebuild too, but most rebuilds done are unnecessary, IMO.

EVERYTHING's easy for the guy who doesn't have to do it.
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