tbi vs carburator
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tbi vs carburator
i have 1989 D100 with throttle body, 318 with what i believe to be about 90,000 miles, thinking about converting to carburator. i am concerned about when computer is eliminated, what will io have reroute as far as electrical if anything. the reason i am considering doing this is i dont believe these computers can be repaired or replaced and i would also like to improve my fuel milage. any help out there?
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From: Clayton MI
Going to a carb is not going to improve fuel economy, that was the whole idea behind fuel injection, with a feedback loop. (O2 sensor...) The computers ARE replaceable, but, they are getting harder to find.....
Record Breaker
Joined: Sep 2010
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From: Parker, SD
https://siaelec.com/product/dodge-ec...repair-return/
Not sure the quality but in todays world I couldn't believe someone isn't rebuilding these?
Rock auto also has reman ECUs $170 + Core
Not sure the quality but in todays world I couldn't believe someone isn't rebuilding these?
Rock auto also has reman ECUs $170 + Core
Last edited by dodgetruck2; Aug 16, 2024 at 05:40 PM.
Grand Champion
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It's rare but they can go bad. It also controls ignition and if you have the od trans that's another thing. Stick with the efi, If you are concerned about the pcm look up the # on yours and see what you can find on ebay. I had a 90 and no issues with the pcm and it had just over 200K when i sold it.
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Look for local parts trucks too. The TBI ones are the least popular around here. $50-600 for a whole one IME. Then you get the PCM and all kinds of extra goodies.
You can approach TBI economy with a carb. What you sacrifice is cold-start drivability, usually. OD trans and/or axle ratio ratio change can help the fuel economy.
You can approach TBI economy with a carb. What you sacrifice is cold-start drivability, usually. OD trans and/or axle ratio ratio change can help the fuel economy.
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Joined: Apr 2010
Posts: 87,483
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From: Clayton MI
Look for local parts trucks too. The TBI ones are the least popular around here. $50-600 for a whole one IME. Then you get the PCM and all kinds of extra goodies.
You can approach TBI economy with a carb. What you sacrifice is cold-start drivability, usually. OD trans and/or axle ratio ratio change can help the fuel economy.
You can approach TBI economy with a carb. What you sacrifice is cold-start drivability, usually. OD trans and/or axle ratio ratio change can help the fuel economy.
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Joined: Nov 2017
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I usually switch a whole axle that I snag for $100-200. That can be an opportunity to upgrade to a stronger one, and/or one with a traction aid.
I do have a miracle story with a 6.2L diesel truck I once had. I swapped in an old 4spd manual and an axle with airplane gears. I reckon I was $400 in (total) and the mpg went from 12 to 17. Granted, I wouldn't expect that kind of result with a 318 gas.
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From: Clayton MI
Depends.
I usually switch a whole axle that I snag for $100-200. That can be an opportunity to upgrade to a stronger one, and/or one with a traction aid.
I do have a miracle story with a 6.2L diesel truck I once had. I swapped in an old 4spd manual and an axle with airplane gears. I reckon I was $400 in (total) and the mpg went from 12 to 17. Granted, I wouldn't expect that kind of result with a 318 gas.
I usually switch a whole axle that I snag for $100-200. That can be an opportunity to upgrade to a stronger one, and/or one with a traction aid.
I do have a miracle story with a 6.2L diesel truck I once had. I swapped in an old 4spd manual and an axle with airplane gears. I reckon I was $400 in (total) and the mpg went from 12 to 17. Granted, I wouldn't expect that kind of result with a 318 gas.