1983 Variable Venturi 2bbl problem
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From: Asheville, NC
1983 Variable Venturi 2bbl problem
My 1983 F-150 with the 351W has a new (to me) Motorcraft 7200 VV carb. I installed it, hooked everything up, and started it up. Ran great for a couple of days. Took an extended drive the other day, and now it won't idle. Sends black smoke out the back.
The computer on this truck, considered dead when I got the truck a few weeks ago, has come to life and has adjusted the idle mix to RICH. I need to get the motor adjusted back to a better mix. Does anybody here know the pin arrangements on the idle mix connector on the VV? I can't work on the computer issues until I can run the motor without risking stopping up the cats, which are brand new. Anybody got the manual?
Help! I cant drive my truck like this. I've had to go back to a GM product! Get me back into a Ford!
The computer on this truck, considered dead when I got the truck a few weeks ago, has come to life and has adjusted the idle mix to RICH. I need to get the motor adjusted back to a better mix. Does anybody here know the pin arrangements on the idle mix connector on the VV? I can't work on the computer issues until I can run the motor without risking stopping up the cats, which are brand new. Anybody got the manual?
Help! I cant drive my truck like this. I've had to go back to a GM product! Get me back into a Ford!
FTE Legend
Joined: Sep 2003
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From: NY and VA
I used to have trouble with the VV carbs, there is a diaphragm in the back of the carb that acts up due to pour drainage. A TSB showed where to drill a small hole to cure this problem. A better solution would be to "convert" to a regular Ford 2v carb.
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From: Asheville, NC
I Need a Solution!
I've got a dilemma. Rebuild the VV carb that I have, which I can do, since I just shelled out $55 for a rebuild kit for it at O'Reilleys, or rebuild the Holley 2bbl that does not really fit the engine properly, but came with the truck when I got it. This carb has no id numbers on it. Several pros have looked at it, or just pull the manifold and install a 4bbl? I'll probably vote for the rebuild myself, but I will listen to all arguments. I'm new here, but I know alot about older cars. Been working on my own cars since 1970 when I was 14.
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From: Billings Montana
I would go with the 4bbl intake and carb. I absolutely swear by Edelbrock. You could shell out a few bucks and get the intake and carb, and then be done with it, or you could rebuild the VV carb, and hope you won't have to do it again.
The 4bbl main jets are smaller than the 2bbl jets so you might pick up a few MPG's, get better throttle response and lighten the front end up by a few pounds. It's all a matter of personal choice, and I think it's better to have the secondaries for on-ramp giddy up, towing up hill's whatever, than to not have them and bog down when you need that extra oomph!
The 4bbl main jets are smaller than the 2bbl jets so you might pick up a few MPG's, get better throttle response and lighten the front end up by a few pounds. It's all a matter of personal choice, and I think it's better to have the secondaries for on-ramp giddy up, towing up hill's whatever, than to not have them and bog down when you need that extra oomph!
More Turbo
Joined: Jul 2003
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From: SC
You might try disconnecting the plug-in to the idle controller. It will run a tad leaner than you'd like at idle, but it should be OK. I drove my 82 around for 2 years with it disconnected. Ran just fine.
A problem on the 7200's and 2700's both was the cold start enrichment needle would to to gum up and stick in the bore. Yours might be sticking open or partially open which certainly will cause it to run rich after the engine warms.
I ran the 7200VV until I found a non-computer 2700VV to rebuild and use instead. About 6 years of driving both of them and the darn idle enrichment needle sticking was the only trouble I ever had with them.
A problem on the 7200's and 2700's both was the cold start enrichment needle would to to gum up and stick in the bore. Yours might be sticking open or partially open which certainly will cause it to run rich after the engine warms.
I ran the 7200VV until I found a non-computer 2700VV to rebuild and use instead. About 6 years of driving both of them and the darn idle enrichment needle sticking was the only trouble I ever had with them.
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Joined: Mar 2003
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7200vv
Holley made / possibly still makes a direct replacement for that carb. accepts factory wire and is smog compliant. Seems like I paid about $250.00 for it. I bought one about ten years ago . I just looked at the holley website, they had this carb listed as a reman wit part# 64-5589.
Last edited by johnraym; Nov 7, 2004 at 12:17 AM.
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