Question about 1993 GMC Safari
All an engine needs to run is air, fuel, spark, and timing. You appear to be getting fuel. Pull a plug and reconnect it to the plug wire. Ground it to the engine away from gas and fumes and see if you get a good hot blue spark. If so cover the intake with your hand and turn the engine over. If you feel vacuum then you are probably getting air. If all of these things are okay then you are most likey looking for a timing issue. This could be mechanical like the timing belt or chain, valve train and cam(s), etc... It could also be the engine management systems including camshaft positoin sensor, mass airflow sensor, etc... I am assuming the van has the 4.3 Liter V-6 common for that model.
If it backfires it is probably getting spark maybe not at the right time. If these simple checks pan out you probably need to refer this problem to a mechanic.
Posted on Nov 14, 2008
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