I need help interpreting vacuum test results

[Ranchero50]

The accelerator circuit doesn't have a lot to do with the idle quality when cold. You can remove the squirter by removing the phillips screw and check to see that there isn't a peice of trash in the one side.

Jamie

[HOWDY69]

The accelerator circuit doesn't have a lot to do with the idle quality when cold.

I figured the idle circuit didn't effect the idle quality but now I thnk I have more than one issue.

You can remove the squirter by removing the phillips screw and check to see that there isn't a peice of trash in the one side.

I'll check that. There are porous copper screens at the inlets so it would be hard for something to get through but I will check anyway just to be sure.

[Dragon]

Idle and accel are two different circuits and they only share the float bowl as their common point.

And over 200 Holleys new and old and that I have rebuilt used and installed etc etc I have never seen trash in any Holley except on the real old mickey moused ones. Or the ones left out in the rain. If you pulled your carb out of the box and put it on the engine and you have not removed the float bowl or accel pump call Holley and complain.

Open a complaint ticket on their website they will get back to you usually the next day.

[HOWDY69]

I removed the pump discharge nozzle and there was a grey powder on the threads of the screw. This powder was also packed in the slots and around the pump discharge needle valve. Should I remove the valve and clean it and if so how do I remove the valve. What if I just pumped the throttle? Would that clean it or would it just shoot the valve out and then I would lose it.

[Dragon]

It would shoot the needle out and if the carb is on the engine, your moving the throttle would shoot the needle up and then it falls down past the throttle plates into the engine. Take the carb off to do this. When I change pump nozzles with the carb on the car I tie my throttles closed just to keep stuff out of the engine. Don't use a magnet on the needle or screw. They will stick together and the needle will not function.

Weird that you have this stuff in the carb. Make sure you don't lose the 2 round gaskets one for the screw and the one under the Pump Nozzles.

[Dragon]

What Holley do you have? I also have a 4160 but that only means it has one Metering block on the front and a meter plate in the rear float chamber. A 4150 means two meter blocks. Mine really is a 80508S 750 cfm Vacuum Secondaries, Electric Choke, Concours (polished)Model ( that is what the S is for).

[HOWDY69]

What Holley do you have? I also have a 4160 but that only means it has one Metering block on the front and a meter plate in the rear float chamber. A 4150 means two meter blocks. Mine really is a 80508S 750 cfm Vacuum Secondaries, Electric Choke, Concours (polished)Model ( that is what the S is for).

650 cfm 4150 80783-1

I pulled it off...it is suppose to rain most of the week. Now I can work on it inside. This also means I can get my 48 year old eyes at the right focal distance to see things.

[HOWDY69]

The pump discharge needle valve does not want to come out. I turned the carb upside down...I pumped the accelerater pump...I removed the pump and blew through the pin hole...it does not want to come out.

[Ranchero50]

Well, if you've pulled it I would suggest a renew kit and going through it correctly.

Jamie

[HOWDY69]

10-4

[Dragon]

Reach down with a tooth pick and wiggle it.

[HOWDY69]

When I embed the picture I get a red x instead of the picture but the link will take you to the album.

Reach down with a tooth pick and wiggle it.

I tried a toothpick and a large sewing needle but it will not budge. Here are some pictures.

1) This is the powder that was around and below the screw. I think it is packed around the needle,

http://www.fordification.com/galleries/ ... ?pos=-5679


2) Here is the primary bowl. It is coated with the powder.

3) Here is how much powder a few strokes of a screw driver will scrape out of the bowl.

4) Here is the primary plate.

[Dragon]

How old is this carb??? That carb has it's coating coming off it.

For accelerator pump stuff go to carb tuning and Accel pump on the left.
http://www.holleytv.com/featured_landing.php

[HOWDY69]

How old is this carb??? That carb has it's coating coming off it.

For accelerator pump stuff go to carb tuning and Accel pump on the left.
http://www.holleytv.com/featured_landing.php

Three years old. The dust must be going into the accelerator pump and then it is forced up into the needle valve.
Is the carb now a paper weight?

Thanks for the link I can tell I will be watching it a lot.

[DuckRyder]

You might give Holley a call, I think I recall them having a bit of trouble with that and they "might" take care of it.

But, yeah, I'd replace that...