MCFA document: 000098-08C Sept. 22 2008
GP40K GP45K GP50K
Subject: TB45 engine backfiring- The engine backfiring may also burn the air filter.
Cause: Dust could enter the distributor cap. Check the mass air flow sensor. Dust can fill the cam sensor photo slots causing the engine to miss and backfire. Check the air filter for burned spots
Resolution: Remove the distributor cap and three screws holding the cover. Blow out the distributor assembly. Seal the three vent holes on the base with sensor safe silicone sealant. Remove the Mass Air Flow sensor and clean only with MAF sensor cleaner. Do not use brake or carb cleaner. They both leave a residue and will affect plastics and rubber O-rings.
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