98 4.3 chevy blazer backfires


Asked by Oct 14, 2013 at 11:29 AM

Question type: Maintenance & Repair

replaced coil, wires  plugs cap rotor crank senser coil module. checked out voltage + resitance on componace metioned. all are in limits.compretion is good. no vacume leaks.  on this model cam senser will not cause a driveability isues. what to check next?

1 Answer


If it backfires when you take your foot off the accelerator pedal you have a bad diverter valve for the A.I.R. (air injection reaction) system. HTH. -Jim

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