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Bucking Truck

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Old 01-23-2014, 02:48 AM
tchristian tchristian is offline
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Bucking Truck

I'll apologize in advance if this has been addressed in posts elsewhere, but I'd like to get a few opinions.

I have a 1958 F100 with a 292 y-block, 2v, 4-speed manual. The other day while driving on the freeway it began bucking violently. I thought it was starving for gas, so I replaced fuel filters, air filter, and even the fuel pump (which had previously been replaced with an electric). None of this seemed to help. I replaced spark plugs and HT leads about 500 miles ago, so I'm assuming they're OK. It seems to start bucking at about 45-50 mph going uphill. Is a carb rebuild the next step, or is there something else that might fix it? New coil maybe? Any suggestions would be appreciated. Thanks.
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Old 01-23-2014, 02:52 AM
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When you replaced the filter, was it clogged?
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Old 01-23-2014, 03:13 AM
The Horvaths The Horvaths is offline
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I have seen a damaged clutch/pressure plate cause bucking under load. However, I'd check float level or even rebuild carb before suspecting that.

Might try a fuel flow test. That would let you know if the fuel line is clogged, has a pinhole leak, or the tank's sock is clogged.
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Old 01-23-2014, 07:57 AM
f5fordgirl f5fordgirl is offline
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Might check the point gap too.
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Old 01-23-2014, 08:31 AM
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Sounds like an ignition misfire to me
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Old 01-23-2014, 08:59 AM
Branded Branded is offline
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Vacuum leak ??
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Old 01-23-2014, 12:13 PM
tchristian tchristian is offline
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Quote:
Originally Posted by FortyNiner View Post
When you replaced the filter, was it clogged?
No, the filter was actually pretty clean.
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Old 01-23-2014, 12:14 PM
tchristian tchristian is offline
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Might check the point gap too.
I changed out the points when I did the plugs a few months ago. I can check the gap, but I don't think that's moved since then.
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Old 01-23-2014, 12:21 PM
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Originally Posted by The Horvaths View Post
I have seen a damaged clutch/pressure plate cause bucking under load. However, I'd check float level or even rebuild carb before suspecting that.

Might try a fuel flow test. That would let you know if the fuel line is clogged, has a pinhole leak, or the tank's sock is clogged.

It's funny you mention the clutch. That's something that's been in the back of my mind, as there's been some slippage under load/acceleration. I've also been noticing the "burnt brake" smell lately. I'm inclined to follow that lead before rebuilding the carb since it obviously needs the clutch regardless. I just wasn't sure if that's something that would have caused bucking rather than loss of power altogether. Why would a worn clutch cause that? Would it be the clutch plate slipping then suddenly grabbing the flywheel?

I'll also check the tank sock. The sending unit is in need of replacement anyway, since I'm getting inaccurate fuel level readings (full tank registering as only a quarter).
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Old 01-23-2014, 12:52 PM
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Fuel usually isn't a cause for bucking, it's usually ignition. Check the wire that goes from the coil to the points. Where it runs under the points plate, they can get chafed and short out intermittently when vacuum advance moves the plate.
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Old 01-23-2014, 01:59 PM
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X2 on what Ross said^^^^^^ . This is your problem I would bet for sure.
Or in that area. I have seen this so many times and it will drive ya nuts.
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Old 01-23-2014, 02:49 PM
dadgonebroke dadgonebroke is offline
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bucking

Quote:
Originally Posted by ALBUQ F-1 View Post
Fuel usually isn't a cause for bucking, it's usually ignition. Check the wire that goes from the coil to the points. Where it runs under the points plate, they can get chafed and short out intermittently when vacuum advance moves the plate.
I admit this doesn't happen often but I had a car that was only driven for a one week period each year. When I was done driving each time- I would fill the gas tank to the top. After a few years, it drove just fine from full tank down to half. If I let it get under 1/2 it would buck like a bronco! The tank was pulled and had more than 5 gallons of water in it.
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Old 01-23-2014, 03:50 PM
tchristian tchristian is offline
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Arctic, which one is Ross?
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Old 01-23-2014, 03:54 PM
tchristian tchristian is offline
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Broke dad, I took a look in the tank this morning and it doesn't appear that there's any water in it, unless it's homogenized with the gas really well
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Old 01-23-2014, 04:29 PM
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Arctic, which one is Ross?
Ross is ALBUQ F-1
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