#%^ BACKFIRE (1 Viewer)

[TOYOTADRUNK]

MY 85 FJ60 W/HEADER,NO CAT CONVERTER,DE-SMOGED.
RUNS GREAT,STARTS GREAT BUT BACKFIRES LIKE HELL WHEN I LET OFF THE GAS AT ALMOST ANY SPEED(WORSE WITH SPEED)CARB. HAS BEEN REBUILT BY JIM CHENOWITH 1000 MILES AGO,TRUCK DID NOT BACKFIRE BEFORE WORK WAS DONE.ANY IDEAS?

 

[73lndcrsr]

How is the jetting? &nbspo your plugs look okay? It sounds like it could either be too lean or you may have a timing issue.

Hope this helps.

BTW your plugs should be a light tan color.

 

[Pin_Head]

This is one of the unintended consequences of "de-smogging". Re-install the throttle positioner on the carb and hook it up to the VSV so that it works properly and the backfiring will go away.

 

[TOYOTADRUNK]

HEY,I FIGURED IT OUT MYSELF UNSCREWED MY FUEL CUTOFF
AND THERE WAS A BIG BUGER IN THE END OF IT, SPRAYED SOME CARB CLEANER IN IT AND THE HOLE WEAR IT THREADS AND WALA NO MORE #%^ BACKFIRE.I LOVE MY CRUISER!!!! :G :G