EFI to Carb?
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New User
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EFI to Carb?
I have a 91 F150 4x4 with a 5.8 EFI. I want to get rid of the EFI, Computer,
smog junk, and cat conv! I want to go with a Torker intake, headers, stainless exhaust, etc. As of the first of the year the truck will be 25 years
old and I can register it for classic car/truck plates which in Texas means no state inspection!
Any ideas? KJ
smog junk, and cat conv! I want to go with a Torker intake, headers, stainless exhaust, etc. As of the first of the year the truck will be 25 years
old and I can register it for classic car/truck plates which in Texas means no state inspection!
Any ideas? KJ
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
I assume you meant 5.8 because there was no 3.8 in a truck.
What trans does it have? If it's the auto you're up against it because it is controlled by the same computer the engine is and it won't work at all without the computer and several powertrain sensors including the throttle position sensor and vehicle speed sensor. If it's got a manual then have at it but don't expect to see any power gains.
What trans does it have? If it's the auto you're up against it because it is controlled by the same computer the engine is and it won't work at all without the computer and several powertrain sensors including the throttle position sensor and vehicle speed sensor. If it's got a manual then have at it but don't expect to see any power gains.
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Afternoon, Paul!
Sorry, Typo! I want to get rid of everything dealing with the EFI and computer!
I have a new 22 circuit wiring harness I was going to use and re-wire the truck
with out all the sensors! KJ
Sorry, Typo! I want to get rid of everything dealing with the EFI and computer!
I have a new 22 circuit wiring harness I was going to use and re-wire the truck
with out all the sensors! KJ
Senior User
Joined: Dec 2010
Posts: 221
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From: Carlisle
Outside of the novelty of putting a carb in with your own hands I think it warrants asking why you want to switch. As Conanski said (and he should be taken seriously) you won't really get any power gains and you'll loose a lot of convenience and precision (think about choking the motor on a cold day- no thank you). I'm guessing that you have an manual tranny as well since (again Conanski) an auto tranny needs the inputs and information about the engine to figure out which gear to be in...
Posting Guru
Joined: Apr 2011
Posts: 1,119
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From: Hartland, WI
Sounds like a bit of time and money to take a step backwards technology-wise. You can still ditch the cat and AIR system to clean things up if you'd like, the EFI will work fine without those. (just keep the solenoids plugged in)
Logistics Pro
Joined: Mar 2011
Posts: 4,197
Likes: 558
From: Central Wisconsin
Unless you fried the computer in your truck and already have the parts and time to put it together, there is no reason to put on a carb. You will be spending money on parts and lose power and fuel economy as well as reliability.
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Lead Driver
Joined: Feb 2013
Posts: 5,006
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From: Roseville, MN
Sure, it's a step backward in power, economy and reliability. But face it, if we were all interested in maximizing power, economy and reliability we'd be driving Super Duties with Triton engines. But we're all on this forum, meaning we're willing to sacrifice some of that for some reason or another (have you noticed that '87-'96 F-series are gouped under "older, classic & antique trucks"?). If your reason is cost, it's probably cheaper to stick with the computer. But look at tonkymans thread on running better with SPOUT connector removed. The best analysis seems to be a bad computer. And the recommended fix? Go to a junk yard and get a computer that's not quite that bad yet. Not bad advice, and it'll result in the most power, economy and possibly reliability for the lowest cost. But I sure see the draw to going to technology that isn't likely to completely strand you, even if it's not quite as good 99% of the time
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