which 2bbl??
Elder User
Joined: Mar 2004
Posts: 517
Likes: 2
From: Texas
VV Carbs
VV stands for variable venturi (feed back type). Most people hate this type of carb. Like the Cadillac 8-6-4 engine, it looked good on paper, tested well in the lab, but was a disaster after mass production. If your vehicle has the VV carb and you are not familiar with how it works, get a rebuilt one from a reputable dealer.
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Elder User
Joined: Nov 2003
Posts: 752
Likes: 0
From: Kalispell, MT
the carb i currently have on my engine (300-6) is a single barrel that has a throttle position sensor, a sensor on the bottom butterfly (i think that's what it is, anyway), and a third set of wires going to a plug that comes off of the driver side of the carb...i'm looking at going to a 2bbl carb on this engine (at least until i get my other engine built how i want, 4bbl, dual exhaust, some other mods, etc...), and want to know which 2bbl to get for the current application...daily driver, some off-road/hill climb/lugging up and down mtn roads while hunting, etc...any other info would be helpful...thanks a ton...
MontanaFord
MontanaFord
Senior User
Joined: Jun 2002
Posts: 330
Likes: 1
From: Chandler,Arizona - USA
I looked at your profile and noticed that your truck is an '84. Your carb would be an electronic feedback type. You also have a computer under the dash, that controls the carb. As 82f1507.5 said, this system was a disaster. Computers and carburetors do not mix. My '85 is the same system you have. I changed it over to the Duraspark 2 ignition. No longer computer controlled.
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Laughing Gas
Joined: Dec 2003
Posts: 796
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From: KCMO
Originally Posted by PaulzF150
... My '85 is the same system you have. I changed it over to the Duraspark 2 ignition. No longer computer controlled.
Anyway, I've been wondering if there is another system I can switch to that will not be dependent on all the sensors and not have a computer control. It looks like you just said "yes" - is it hard and/or expensive?
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More Turbo
Joined: May 2002
Posts: 594
Likes: 5
From: Wetumpka, Alabama
Originally Posted by pchristman
It has the TFI system, mounted on the distributer. Diagnosis points to the module, but it tests out good.
Laughing Gas
Joined: Dec 2003
Posts: 796
Likes: 1
From: KCMO
Originally Posted by Katmandu
Is that the ONLY thing the Computer has control over ?? 
I would like to disconnect the computer, replace the distributer, and eliminate all of those vacuum switches.
Posting Guru
Joined: Jan 2003
Posts: 1,412
Likes: 0
From: Munroe falls, Ohio
i converted from tfi to ds2 and it was night and day. it cost me $100 for dizzy,ds2 module, wire harness. i gained 2 mpg cause my computer only controlled the timing and all the wires from the comp had some voltage on them even grounds.
Laughing Gas
Joined: Dec 2003
Posts: 796
Likes: 1
From: KCMO
How much of a harness did you have to get? What did you do with the wires to the carb? Was the voltage on all the wires from the computer on the old unit on on the Duraspark?
I probably have a thousand questions just like these, and would really appreciate any and all input.
I probably have a thousand questions just like these, and would really appreciate any and all input.
Senior User
Joined: Jun 2002
Posts: 330
Likes: 1
From: Chandler,Arizona - USA
I have a schematic of the computer. Its not in the greatest shape as far as clarity, but, it looks like that it has all the vehicle's electronics routing into it. It has terminals for the lights and many other things. When I converted the truck to DS-2, I removed the thinner black ground wire from the battery. As this wire has to do with the grounding of the puter. I just folded it and taped it, as leaving it attached would drain the battery.
PCHRISTMAN: Use the search engine in this forum and search for Duraspark. There's a ton of information on how to convert your truck from TFI to DS-2. I would reccomend that you get the wiring harness before getting any other part. The wiring harness is the hardest part to get. I got lucky and was able to get one from Ford. Look in my profile. You should be able to find my posts. One of them has the part number. Good luck.
PCHRISTMAN: Use the search engine in this forum and search for Duraspark. There's a ton of information on how to convert your truck from TFI to DS-2. I would reccomend that you get the wiring harness before getting any other part. The wiring harness is the hardest part to get. I got lucky and was able to get one from Ford. Look in my profile. You should be able to find my posts. One of them has the part number. Good luck.
Senior User
Joined: Jun 2002
Posts: 330
Likes: 1
From: Chandler,Arizona - USA
Me again, I made a mistake as to what the computer does. Things like carbueration, ignition and timing are controlled by the computer. All those sensors are monitored by the computer too.
While I was digging around I found the part number for the Duraspark II Wire Harness.
DS II Wire Harness Part Number: FOD7JL-12A200-CB
I used this on a 4.9L six cylinder motor. Dizzy is on the driver's side of motor.
While I was digging around I found the part number for the Duraspark II Wire Harness.
DS II Wire Harness Part Number: FOD7JL-12A200-CB
I used this on a 4.9L six cylinder motor. Dizzy is on the driver's side of motor.
Last edited by PaulzF150; Sep 14, 2004 at 11:37 PM.