Carb backfiring at high speed
Thread Starter
Racer
Joined: Sep 2002
Posts: 402
Likes: 0
From: Kingsport TN
Carb backfiring at high speed
Guys, gotta problem with my holley 750 vacuum secondary.
when i accelerate, it backfires, not bad, just a lot, especially 4k and above
new power valve too, what could it be?
timing too advanced or retarded?
btw, i have new fuel pump on it
and thanks
when i accelerate, it backfires, not bad, just a lot, especially 4k and above
new power valve too, what could it be?
timing too advanced or retarded?
btw, i have new fuel pump on it
and thanks
Thread Starter
Racer
Joined: Sep 2002
Posts: 402
Likes: 0
From: Kingsport TN
Re: Carb backfiring at high speed (clem zahrobsky)
could it be a rocker too loose?
it dont do it all the time, just in high revs during acceleration
[Modified by SharkBit, 2:50 AM 10/24/2002]
it dont do it all the time, just in high revs during acceleration
[Modified by SharkBit, 2:50 AM 10/24/2002]
Racer
Joined: Apr 2002
Posts: 324
Likes: 0
From: port jefferson station ny
Re: Carb backfiring at high speed (SharkBit)
car could be running to lean, arc in distributor cap causing misfire, floating valve, vacuum advance diaphram in distributor or advance weight springs causing to much advance although the last one should also cause a ping. I think it's probably a lean carb. Check to see if fuel is running through the secondaries when you crack them open. you can do this at a slightly higher than normal idle. there is also an enrichment valve that sits in the fuel metering block on a holley carb check this also. wcj
Le Mans Master
Joined: Aug 2000
Posts: 9,662
Likes: 7
From: Semper ubi, sub ubi
Cruise-In VI Veteran
Cruise-In VII Veteran
Re: Carb backfiring at high speed (SharkBit)
The most obivous thing is that the car exhibits symptoms of running lean, check your fuel filters and your fuel pump. If the filter is partially plugged or you have low flow from the pump it will misfire on acceleration and above 4000 rpm.
At least 3 or 4 times a year someone posts with these same identical symptoms and 90% of the time it is fuel flow related.
Good Luck!
At least 3 or 4 times a year someone posts with these same identical symptoms and 90% of the time it is fuel flow related.
Good Luck!
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