backfire thru carb

[79malibubbctt]

Does your holley have a power valve protector. If it doesnt you probablly blew your power valves too.

 

[psgp]

woody if its a broken spring or guide why dont it have a miss or do it down track and have power valve blow out on carb i ran friday nite made 6 runs first run was great second run big backfire 3 4 5 run great 6 another backfire

 

[psgp]

gonna try another carb to see if it does it again any other suggestions on this ??? thanks

 

[pontiacgp]

changing the carb won't cure that, when it's dark tonite start the car and look for any sparks on the wires and plugs.

 

[techg8]

Going too lean too fast can induce a backfire through the carb. check accellerator pump function to be sure theyre adding fuel on heavy applications of throttle. Maybe it needs a little heavier shot.

 

[psgp]

we looked for spark around wires it was at nite when i raced and talked to my engine builder and he told me to try a diffrent carb so if it does do it can rule that out i checked for vaccuum leaks today around carb intake looked over dist and could not see anything wrong thanksfor any info

 

[psgp]

took carb apart to check it out and found that i had no power valve in rear and 73 jets u guys think that could cause it to backfire when leaving line so far only i found out to be wrong??? thanks

 

[pontiacgp]

If you have 2 power vales that carb wasn't meant for street use. For a street car it's recommended for the rear power valve to be removed but when it is done you need to go up a few sizes on the jets. The reason it's removed is that every time the vacuum drops you'll be dumping fuel down the secondaries even when they are not needed

 

[woody31]

your issue is your carb,,, try loooking up sean murphy inductions,,, problem solved,,,,, your welcome

 

[psgp]

thanks guys borrowed a carb and test and tuned and had no problems was definately in the carb car ran good and consistant thanks again for all the input