Need help with engine bogging....

[Jim Oaks]

Part store people are so f---ing stupid. I called to see if they had any gasket kits for a Holley carb. Told them it's their Truck Avenger but it's based on the 4150 series. The model is a 90670.

They want the year of my truck, model, etc. They said they can't cross reference it without the vehicle info. What a dumb ass. How much holley carb components could they possibly stock that they couldn't just go look and see if they had any Holley gasket kits?

The worse part is that it wasn't even a young guy. It sounded like an older guy that should know better.

 

[smokey]

you could try unhooking the fuel line to the pump and try just fresh gas with a stout mixture of PB injector cleaner or Seafoam in a gallon or two of gas, You have a electric pump and if I recall it is mounted in the engine bay.just drop the hose in the tank and see how it runs and the mix of cleaners may free up the gunk in the carb.

 

[86ford]

jim summit racing could have it to you in 2 days AT MOST. mite just want to order the gasket kit for it or even better yet just do the drive. call them and order it over the phone then go pick it up. i think they are open 9-9?

86

 

[94STXRanger]

I work at Oreillys and we have a whole little wall of Holley gaskets with all the Mr. Gasket crap. If you have one close they should have a little deal with all the gaskets you need.
And they can can cross reference or at least get gaskets for the carb, if they are having troubles have them call the tech line.

 

[martin]

sounds like a power valve issue to me.

 

[skippy]

sounds like a power valve issue to me.

+1.i have been getting my jets at advance auto,look em up on line,go in pay for em,pick em up next day.power valve too,i would expect the gaskets to be same deal.

 

[skippy]

some useful info for holley users.
http://bgsoflex.com/auto.html,

http://www.bob2000.com/carb.htm

 

[Will]

If it's not smoking it's not the power valve. When you first start the engine, manifold vacuum sucks the valve closed. If the diaphragm is ruptured, raw fuel gets sucked in through the manifold vacuum passage and it will smoke.

Are the shooters working when you look down the air hron and open the throttle by hand? With the engine off, it should squirt the whole way from closed to wide open. There's a check ball in the accelerator pump diaphragm that is supposed to drop out of the way and let the fuel past, but when the accelerator is moved suddenly is thrown up to block the inlet and force the gas up to the discharge nozzles. Then, there is a valve under the shooters if you take the screw off and pull them out of there. It looks like a needle valve on your bowl float. That one is to keep the air going down the carb throat from pulling fuel out of the diaphragm chamber. If it isn't giving you a good long shot of fuel, either of those valves could be stuck (ball or needle) or the diaghragm could be ruptured.

 

[almostclueless]

For what it's worth, I've READ that some modern speciality holleys have two potential probs.....shaving found in the metering bodies and flaking finish in the bowls.


I refuse to pay the prices associated with them, so I don't know first hand.

 

[skinner]

But Will, the OTHER end of the spectrum, when the powervalve refuses to open. i've had one get rusty and do this, and i suppose 2 yr old hot gas could gum it up bad enough.

 

[Will]

The powervalve is open when the engine isn't running. If it were going to stick, it would stick open. But with 15" of vacuum it has probably 15# of force pulling it closed when you start the engine. That's quite a bit of force for a little rubber seal to hold back.

I never really liked Holley's that much. I especially hate the 4160 bowls with those stupid o-rings on the line pinched together with the bowls. It's a half-assed carb with things stuck all over the outside of it--and you have fuel resting on a gasket. The quick-change jet kits with that stupid tool is bad, you can't see through that 1/2" plug kit Jim was describing to set the floats, you have to dump fuel all over the engine to do anything, there's three diaphragms in a vac sec carb to fail. They never put up with sitting like Jim is experiencing. They are much more prone to going lean or stalling on hills, which is why they need the Avenger offroad one.

An AFB is by far a better carb for the unwashed masses. Everything I just said was bad about a Holley, an AFB doesn't have it. I traded my last Holley, a 4779, for a 50's Rockwell bandsaw. The bandsaw is a better carb than a Holley.

 

[Jim Oaks]

I took the bowls and metering blocks off and cleaned them. Soake them in cleaner and blew carb cleaner through the passages.

The primary bowl in the front looked good. The secondary in the rear didn't.

I also found that the rubber vacuum line cap on the large vacuum port at the rear of the carb was cracked and could actually allow air to pas through it.

It's running a better now. I'm following Bobby's advice to clean the carb and top it off with fresh fuel. I still have to add more fresh fuel to the mix.

 

[Will]

Was the accelerator pump working?