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post #1 of (permalink) Old 01-29-2005, 03:27 AM
abrrox
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Smoke when starting! This can\'t be good.

Guys, any advice?

My truck is a 1980, 351 Bronco. A few weeks ago the carb crapped out so I had Ford rebuild it (Holley 600 with a manual choke). It ran pretty good but not perfect, until today.

When I tried to start it, it cranked and cranked but wouldn't catch. So I smelled gas, cursed Ford, and was going to let it sit for a minute, WHEN, I noticed smoke coming out from under the hood/grill (passenger's front).

Well, holy crap, I grab the fire extinguisher, jump out and pop the hood and there is some wisps of smoke coming out from right by the battery (passenger's front). It doesn't seem to be coming from the battery or the selenoid, etc., but it's there and I can't tell where it is coming from. But, that location is where the intake tube for air cleaner meets the grill. So, I'm thinking the carb is smoking and the smoke is coming out there.

Well, once the smoke stops (20 seconds or so) I spray some starting fluid into the intake tube, and it starts but dies when the revs go down, and I struggle with this all the way to my destination. I get there and park it. An hour later I come back, and behold, it fires right up! Vrooom. So I drive it again, park it. Another hour later I go to start it and same thing, no start and smoke. Again, it gets going and runs fine.

I'm ready to go back to Ford and pop a gasket but I need your expert advice first. Can anyone offer any advice on this? I paid $500 for the rebuild [img]images/graemlins/deal.gif[/img] and it's my only vehicle - I need it to run.

Thanks.

Brad
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post #2 of (permalink) Old 01-29-2005, 11:04 AM
 
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Re: Smoke when starting! This can\'t be good.

Blown power valve! First off, I'm going to assume you have a 4V. For $500, you could have bought new QuadraJet.

My suggestion is to scrap the Holley and replace it with an Autolite. If you want to retain the Holley then buy 6 or 8 power valves and keep them in the glovebox ... You'll need them.
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post #3 of (permalink) Old 01-29-2005, 12:25 PM
curtcon
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Re: Smoke when starting! This can\'t be good.

I don't know alot about carbs but I would take it back and have it fixed from ford sounds like they f#$%ed up.
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post #4 of (permalink) Old 01-30-2005, 01:43 AM
abrrox
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Re: Smoke when starting! This can\'t be good.

Thanks Rockcrusher. I did some reading on blown power valves as you said, and yip, it would describe my truck pretty well. What gets me is that it will run fine and then like crap. You'd think it'd just be perma-crap?

Either way, I'm stuck with this Holley so wish me luck at Ford.

Thanks!

Brad
post #5 of (permalink) Old 01-30-2005, 01:23 PM
 
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Re: Smoke when starting! This can\'t be good.

The bad news is that power valve is the weakest of the weaknesses in a Holley carburetor ... The good news is that you can replace it in about 15 minutes (which is probably all the Ford dealer did).

Here's the drill:

1. Remove the air cleaner
2. Disconnect the fuel line from the carb.
3. Remove the 4 screws that hold the float bowl on the carb.
4. Pull the metering block off the carb. It's a chunk of metal about ˝" thick.
5. Unscrew the power valve from the back side of the metering block and screw in a new one.
6. Replace the float bowl and the metering block.
7. Wait a week or so and repeat steps 1 thru 6.

Make sure you don't booger up the gaskets when you take it apart or you'll have to replace them. Make sure you put a new fiber o-ring under the power valve ... A leak here will have the same symptoms as a blown power valve.

BTW, you don't have to take the carb off the engine to do this.
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post #6 of (permalink) Old 01-31-2005, 09:06 PM
abrrox
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Re: Smoke when starting! This can\'t be good.

Thanks for that info. I have an old Holley kicking around and did what you said to get to the power valve... pretty easy. I'm glad for that, 'cause of your Step #7. It gave me a good laugh.

Thanks again!

Brad
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