Question about 1993 Saturn SC2
Have a 93 Saturn SC2 TOHC. Idles fine but stutters and backfires when accerlerating at speed. also has had overheating problem. Have chnged Thermostat, Fuel and air filter, cooling system presure cap, and cleaned throttle body. If this was an older car I would suspect Spark advance vacume or timming. But none of these adjustments are available on this car.
Check to see it th chain guides are worn. this can cause a retarded or advance on timing. Also do a compression check if you can, this will show that the valves are opening and closing on time. Run some injection cleaner through it first as a sticky injector could also be an issue.
Posted on Aug 02, 2009
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Posted on Jan 02, 2017
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