Reply to "Backfiring engine..."

panteradougMember

If you have spark and you have fuel, it should fire.
Squirt some engine starting fluid in the carb. Not just a little, a ten second squirt, with the throttle plate held open so it goes into the intake manifold.

Verify there are no vacuum caps missing from the carb.

It should start, run for ten seconds then die. If it does, it is the carb or the fuel system.

You will need to know if you have fuel pressure at the carb connection.

If you do have pressure, fuel and spark, and it still won't run, the issue is internal engine.

How many miles does the engine have? You will have all of the issues to check for, including a failed valve stem, i.e., a dropped valve.

The hydraulic lifter CJ Clevelands have the reputation for the valves separating near the head of the valve.

Most likely though is that the valve seats are carbonized and you need to pull the heads and do a "carbon-valve job" as we used to say here.

4/29/1210:10 AM

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