[The Camaro Guy]

454 in my 69 carbons up the plugs in 10 min of running, why so quick? New distributer, timing at 12 degrees advace. New 44 AC plugs and wires, rebuilt carb. Car runs ruff. Could the dizzy be off a tooth or???

 

[bop468]

No, a tooth off only changes the position of the distributor body. As long as the timing is correct it does not care.

 

[427L88]

"rebuilt carb" is first suspect. Float level, fuel PSI too high, etc. Holley? Ensure you set the floats when its HOT.

 

[blm]

Incorrect power valve in carb?

 

[p40]

bump your timing up , check your float level

 

[p40]

are u talking abought idle or going down the road , also what carb r u using do u have vacume advance and ru using full manifold vacume ?

 

[Buzz1969]

It's too rich fuel mixture, air cleaner ?? is the carb the right size for your 454 ? and do you have good spark, coil. ?

 

[The Camaro Guy]

Holley 750 VA rebuilt 2x, adjusted float when hot. The Holley kit for that carb was used. The Accel distributer, complete is brand new. Timing set at 12 degrees advance. Seems to idle fine but down the road is terrible, still has power but boggs a bit and stumbles. Only drove it a mile or less. Bumped to 16 with no difference.

 

[marcrose]

check your compression and vaccuum,could be oil deposits or rich air fuel as stated.

 

[blm]

How much vacuum are you pulling at idle and what # power valve is in your carb?

 

[77 cruiser]

If it had a backfire through the carb PV could be blown.

 

[BillK]

The Accel distributer, complete is brand new.

Vacuum advance ?

 

[The Camaro Guy]

Vac at the manifold is 12. When idling it fluctuates and does not remain constant. Do not know when the power valve # is.

 

[BillK]

I dont think you have answered the question of whether your distributor has vacuum advance or not ?

 

[The Camaro Guy]

Check #8, does have vac advance. What power valve should I have? I would suggest the correct one was in the Holley kit for a 750 VA. Stumpted for sure.

 

[Vintage Musclecar]

As long as it's not blown (and the gasket isn't damaged), the power valve has zero impact on idle and off-idle performance.

Are the idle mixture screws responsive?

 

[modern malibu]

This may sound like a silly question,but is this carb equipped with a choke and if so is it operating correctly? No reason to go off on a wild goose chase for something simple.

 

[BillK]

Check #8, does have vac advance.

????? Does the VA mean vacuum advance ? You are using it with the carb number and that is confusing. If you do have vacuum advance where is the hose connected to ? Straight manifold vacuum or ported vacuum ? What does the timing go up to when you connect the vacuum advance ?

 

[The Camaro Guy]

The same carb has been on the car for 10 years and attached the same way the vacuum hose is connected the the right side of the carb the same as my other 5 cars. I have not checked the timing with the vacuum advanced attached. I have monkeyed with different settings and it seem to like 12 the best. It is somewhat difficult to determine what is best as the car has a pretty radical cam. I replaced the distributer as the original one looked terrible and was thinking it was causing the issues and it has been a few years since the carb was rebuilt. Replaced the plugs and wires and fuel filter as the car has not be touched in a few years. After all this, the car runs terrible and extremely rich and fowls the plugs just idling for 10 minutes. Cleaned them drove the car up the street coughing and bogging down, but has the power when I got on it. Checked the plugs black carbon again. My 2 mechanic friends both have different opinions on the issue, 1 on the distributer and timing, the other thinks it has 2 too tight valves as the manifold pressure bounces all over the place. The carb guy says it is OK. May be time for the crusher!!!!

 

[BillK]

Try putting the vacuum advance hose on a fitting that has vacuum all of the time. Usually one of the ones at the bottom front of the carb.