99 Tahoe 5.7 backfiring from 40-60mph
September 8th, 2009, 10:48 AM
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99 Tahoe 5.7 backfiring from 40-60mph
Hello,
I recently replaced head gaskets, valve stem seals, intake gaskets, fuel pump and filter, distributor cap and rotor, and now having backfiring problems. 40-60mph is 3rd gear overdrive with low RPMs and moderate throttle. I've adjusted the valves 4 times now. I can now hear them clapping so I'm starting to move away from that. Any ideas?
Also, codes say rich mixture in both banks. Chevy dealer troubleshot and can't figure it out. All sensors and tests showed normal.
thanks
I recently replaced head gaskets, valve stem seals, intake gaskets, fuel pump and filter, distributor cap and rotor, and now having backfiring problems. 40-60mph is 3rd gear overdrive with low RPMs and moderate throttle. I've adjusted the valves 4 times now. I can now hear them clapping so I'm starting to move away from that. Any ideas?
Also, codes say rich mixture in both banks. Chevy dealer troubleshot and can't figure it out. All sensors and tests showed normal.
thanks
Last edited by dpchevy; September 8th, 2009 at 10:54 AM.
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