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Ford Truck Club Forum > FORD F-100 | F-150 SERIES > 1948-1983 Ford F100



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Old November 24th, 2018, 08:10 PM
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Unhappy Help! 1963 Ford f100 engine trouble!!!

Hi all, my dad and I have a 1963 ford f100. I am 15 and have had this truck in the family for around ten years. I would love to drive this truck daily to high school instead of a boring old newer car. In the past couple months the engine has been starting to run worse and worse, and now it seems as if the 6 cylinder engine is only running on three cylinders. I pulled the spark plugs out individually today to test which cylinders were firing and there was almost no change to the engine sound in pistons 4 5 and 6. Ive replaced the fuel filter, did an oil change, topped off the tranny fluid, replaced all the spark plugs and wires, drained all the gass ex with no results. The engine does sound better at higher rpms, but only marginally. The engine also shoots black smoke out of the tailpipe every second or so. If anyone whose experienced with these engines could help me out, I would be incredibly thankful. Im having trouble attaching a video to this post but would love to email it to anyone willing to help. Thanks!

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Old November 24th, 2018, 08:39 PM
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Have you replaced the points, condenser, rotor, and distributor cap?

You may want to do a compression test, if one or more cylinders have low compression the only thing that will help that is an engine rebuild.

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2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
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Old November 24th, 2018, 08:44 PM
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thanks glc. I have not replaced the points, condenser, rotor, and distributor cap. I will test for compression in the next week or so but fear the results. Ill let you know the results of the compression test.

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Old November 24th, 2018, 10:30 PM
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I'd do the compression test before spending any more money on ignition parts. Most parts stores have compression testers in their tool loan kits, the kind that screws into the plug hole is easier to use than one with just a tapered rubber tip.

Pull all the plugs and the coil wire, hold the throttle wide open while cranking. Crank till the gauge reading tops out. Then pour a spoonful of oil in each cylinder and repeat, note both readings.

You really need 2 people to do this, one in the cab on the gas and key and one under the hood.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
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Old November 25th, 2018, 11:01 AM
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We are going to do the compression text today. I also just had a thought that it may be the head gasket. Any thoughts?
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Old November 25th, 2018, 11:39 AM
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Anything is possible, let's get the dry and wet compression readings first.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
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Old December 28th, 2018, 06:59 PM
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GLC, Thanks so much for all the help. Cylinder 4 had a zero compression reading. the exaust valve was stuck in the open position because of a push rod that had popped out of the hole. The engine ran great yesterday and was back the way it was before that happened. I planned on taking my grandfather for a drive today but as I pulled it out of the driveway the engine cut out and would not run after many more starting attempts. we put some more gas in and no luck. I want to do a fuel pressure test. Any other suggestions and tips on the fuel pressure test?
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Old December 28th, 2018, 07:32 PM
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Has this truck sat around for a while? If so you may have to rebuild the carb. They get all gummed up inside if they sit with old gas. Also you may have to do a valve job because the newer fuels burn hotter and destroy the valve seats. Maybe the reason the pushrod fell out of the lifter. Also could be a flat cam lobes. Compression test will reveal that.
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Old December 28th, 2018, 07:54 PM
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You don't need anything special to do a fuel pressure test. Remove the coil wire, disconnect the fuel like from the carburetor and wrap a rag around it. Have someone turn the engine over and see if fuel pumps out of it. If not, the fuel pump may be shot or there's a line blockage between the tank and carb. There's also a sock filter on the pickup in the tank.

I believe there's a fuel filter element inside the housing that the fuel line connects to at the carb. If the fuel pump is working but there's no gas in the carb, it's probably plugged. Unscrew the housing and take a look. Also check the line to see if someone installed an inline can filter.

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Old December 29th, 2018, 04:34 PM
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Thanks guys, a little bit of seafoam cleared it right up. We drove it to a friends party this morning however and the transmission seems to be stuck in second but is in the position between reverse and first with some wiggle room. Any ideas?


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