Originally Posted by Sundaymoney
Hello all ! New to this site due to carb. problem.
I recently encountered a problem on my dragster with a new Holley model 0-8896-1 1050 3 circuit carburator. Doesn't want to idle. Its like a vacum leak or lack of fuel. Put new gaskets on both the metering block & bowl sections , needle & seats , intake to carb with 1" spacer. I have the power valves blocked and had various tuners check my adjustments on the idle screws. Flushed out the idle circuits for possible trash. When I first installed it it worked perfect. Did a burnout and after backing up it acted as if it was loading up on me and died. Restarted and noticed a rough idle while I had to really work the throttle to keep it running. It was sluggish outta the gate but picked up under acceleration and ran decent. I've been drag racing over 30 years and have never had a problem like this. Timing is still at 38 degrees and the valves are still a tight .028 . I thought I might of had an internal intake gasket leaking but after putting on a friends carb it idled perfectly. Drained the fuel ( VP Q16 oxygenated) and poured in VP C-12 and still wouldn't idle. I'm about to take a 10 lb hammer to this piece so any suggestions will save it's life.
Frustrated in Texas !
i recently had a problem with the 650 Holley on my 347. It was idling rough and the nitrophil tip on one of the two needles was no good even though the carb was new. It had been sitting for a long time with no use. Have your floats any chance of jamming and flooding it at idle. Just a thought. Is the fuel you are using compatible with the soft parts in the carb. A pro carb builder here showed me a new holley made in China . The casting of the venturis was very ordinary. The tensioning and retensioning of the soft bases is a trap and can distort the diecast material leading to vacuum leaks. Even the float chambers need to be carefully tightened to avoid warping. My accelerator pump surfaces were also distorted. The edge of a steel rule showed up the problem.
Flooding will give you wet plugs/ lack of fuel dry plugs. Another trick for vacuum leaks is to use fuel in a mist bottle and spray around the carb base. If it is drawing air in a rise in rpm will happen when you spray a mist of fuel at it.
If you mist a spray down the throat and it picks up then you have a fuel lean situation. thats all i can think of apart from partially blocked jets. I assume you have the right fuel pressure with a gauge. Too much pressure will flood it also. Hope this is not a hinderence but a help.
One other thing with my 650 Holley , the base gasket was the wrong one and caused interference .
Good luck , dont hammer it.