66 F100 Loss of Power/Acceleration
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66 F100 Loss of Power/Acceleration
Hi,
I have a 66 F100 I've been working on and is the first car I've done 'major' work to. I have done minor repairs on my cars for years, but am limited in experience.
The issue started after I got it back from an upholstery shop who says nothing happened on their end. Ever since, it has no acceleration and top speed is very low. Along with that, it does not noticeably respond to increased throttle in those terms, but the engine does rev up. It also started to overheat when still.
I thought it might be head gasksets because it would get very hot in less than a minute, assuming exhaust going back in, and the general lack of power, and instead of changing the gaskets thought I'd toss a 390 in since I found one for a good deal. After that, it has the same problem!
Could it be the differential?? I thought if it was the diff it would either:
1. Grind.
2. Slip more under heavy acceleration.
3. Not move at all.
Any thoughts would be appreciated.
Thanks!
Peter
I have a 66 F100 I've been working on and is the first car I've done 'major' work to. I have done minor repairs on my cars for years, but am limited in experience.
The issue started after I got it back from an upholstery shop who says nothing happened on their end. Ever since, it has no acceleration and top speed is very low. Along with that, it does not noticeably respond to increased throttle in those terms, but the engine does rev up. It also started to overheat when still.
I thought it might be head gasksets because it would get very hot in less than a minute, assuming exhaust going back in, and the general lack of power, and instead of changing the gaskets thought I'd toss a 390 in since I found one for a good deal. After that, it has the same problem!
Could it be the differential?? I thought if it was the diff it would either:
1. Grind.
2. Slip more under heavy acceleration.
3. Not move at all.
Any thoughts would be appreciated.
Thanks!
Peter
Posting Guru
Joined: Oct 2007
Posts: 1,144
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From: Sedro-Woolley, WA
I'm assuming it is an automatic?
Basic info is essential.
If it is an auto then check the fluid. Look for water on the tranny's dipstick. Does the fluid smell burnt?
Look in the radiator for tranny fluid also.
This is in assuming that you do have an automatic and have an in-radiator cooler.
Once again, basic info is essential. Without it my suggestions are nothing more than SWAGs.(Scientific Wild Assed Guesses)
btw, Welcome to FTE. There is some terrific information here!
Basic info is essential.
If it is an auto then check the fluid. Look for water on the tranny's dipstick. Does the fluid smell burnt?
Look in the radiator for tranny fluid also.
This is in assuming that you do have an automatic and have an in-radiator cooler.
Once again, basic info is essential. Without it my suggestions are nothing more than SWAGs.(Scientific Wild Assed Guesses)
btw, Welcome to FTE. There is some terrific information here!
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Joined: Sep 2012
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Basic Info
Hi,
My fault, it has a T18 4 speed manual with a new clutch kit. Also, it's a 2wd longbed. Not sure if it makes a difference, but the 390 also as for an automatic. It had a small hose and a metal pipe from exhaust to carb, i plugged the outlet for the hose and have the metal pipe just hanging. It also had 2 hoses coming from the intake on the passenger just a few inches from the carb, I think one was for a brake booster and the other ??? and I plugged them both.
I definitely like the site, it's helped me for over a year on various other topics, just haven't had to post until today!
Thanks,
Peter
My fault, it has a T18 4 speed manual with a new clutch kit. Also, it's a 2wd longbed. Not sure if it makes a difference, but the 390 also as for an automatic. It had a small hose and a metal pipe from exhaust to carb, i plugged the outlet for the hose and have the metal pipe just hanging. It also had 2 hoses coming from the intake on the passenger just a few inches from the carb, I think one was for a brake booster and the other ??? and I plugged them both.
I definitely like the site, it's helped me for over a year on various other topics, just haven't had to post until today!
Thanks,
Peter
Posting Guru
Joined: Jan 2011
Posts: 1,670
Likes: 8
If they were just redoing the interior, how could they have mess something up.? Did they remove the fuel line from the tank for some reason? If you have the same problem with the new engine, could it be a plugged fuel line, pump. or fuel filter. If you can rev it up fine but no power when running, maybe its running out of fuel - durt in the line...?
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Fuel Line
Hi,
To clarify on the upholstery shop, I am a pretty cheap guy and pay the price at times, so instead of an actual 'shop', it was moreso some guy who did it out of his garage and barely spoke english and he had a few teenagers around too that may have messed with it.
The pump came w/ the 390 so I'll replace the filter and let you guys know how that pans out. Is there an easy way to test for a plug in the line if that doesn't fix it?
Thank you both for your advice!
To clarify on the upholstery shop, I am a pretty cheap guy and pay the price at times, so instead of an actual 'shop', it was moreso some guy who did it out of his garage and barely spoke english and he had a few teenagers around too that may have messed with it.
The pump came w/ the 390 so I'll replace the filter and let you guys know how that pans out. Is there an easy way to test for a plug in the line if that doesn't fix it?
Thank you both for your advice!
Lead Driver
Joined: Aug 2003
Posts: 6,305
Likes: 18
From: Boulder Creek, Ca
Not an authority, not sure what the shop could have done that would effect engine performance unless carpet was installed and the linkage is binding.
It sounds more like a timing, or carburation issue, has there been any work done on the truck recently in any of these areas. Suggest check for anything obvious; loose hose, a plug/cap used to block a vacuum line or opening, or a vacuum line that is loose or come off? Suggest peform a 'quick' timing check, there are a couple of tools I use where I can check the timing and carb issues from under the hood; an inline spark plug tester and a remote start button, with couple rotations of the engine I can check location of rotor to plug wire, and position of the timing marks. A vacuum gauge could be helpful, how the needle fluctuates, or not can be revealing? Anyhow, food for thought?
It sounds more like a timing, or carburation issue, has there been any work done on the truck recently in any of these areas. Suggest check for anything obvious; loose hose, a plug/cap used to block a vacuum line or opening, or a vacuum line that is loose or come off? Suggest peform a 'quick' timing check, there are a couple of tools I use where I can check the timing and carb issues from under the hood; an inline spark plug tester and a remote start button, with couple rotations of the engine I can check location of rotor to plug wire, and position of the timing marks. A vacuum gauge could be helpful, how the needle fluctuates, or not can be revealing? Anyhow, food for thought?
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