Engine roughness failing cam?
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Laughing Gas
Joined: Nov 2015
Posts: 950
Likes: 73
From: San Diego
Engine roughness failing cam?
Hi all. My f250 has a 390 and Motorcraft 2v.C6. I am feeling a vibration through the gas pedal when I hold speed starting at 20mph. Shifting to NUETRAL the engine roughness feeling stops.
Its prgressed to a miss at idle that I feela on acceleration on hills.
The spark plugs, Pertronic full billet distributor and its cap, along with taylor. 8mm ignition wires were done 14k miles ago.
My engine has a fairly substantial rear seal oil leak
So I dont know if Im burning oil.
So its probably time for a wet & dry compression test and a leak down test...to see what's what...correct?
Its prgressed to a miss at idle that I feela on acceleration on hills.
The spark plugs, Pertronic full billet distributor and its cap, along with taylor. 8mm ignition wires were done 14k miles ago.
My engine has a fairly substantial rear seal oil leak
So I dont know if Im burning oil.
So its probably time for a wet & dry compression test and a leak down test...to see what's what...correct?
Hotshot
Joined: Feb 2004
Posts: 10,808
Likes: 2,604
From: The Shenandoah Valley
Compression test is a good idea, and a in cab mounted vacuum gauge sure would help in the future. Feeling vibrations in the gas pedal could be just linkage too near something. You asked about a failing cam .... I think likely not. A miss at idle that you can feel during acceleration on hills is likeliest ignition related, like plugs or wires. I don't know Pertronic.
Lead Driver
Joined: Oct 2018
Posts: 7,877
Likes: 2,365
The cam is an unlikely cause on a well used engine, your crappy distributor is more likely it. but a bent push rod, bad lifter or valve can cause a similar effect.
Check your plugs and see if they're all firing. check your timing and for vacuum leaks. if everything checks out do a compression check.
Check your plugs and see if they're all firing. check your timing and for vacuum leaks. if everything checks out do a compression check.
Thread Starter
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Laughing Gas
Joined: Nov 2015
Posts: 950
Likes: 73
From: San Diego
Thank you...
Compression test is a good idea, and a in cab mounted vacuum gauge sure would help in the future. Feeling vibrations in the gas pedal could be just linkage too near something. You asked about a failing cam .... I think likely not. A miss at idle that you can feel during acceleration on hills is likeliest ignition related, like plugs or wires. I don't know Pertronic.
Thread Starter
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Laughing Gas
Joined: Nov 2015
Posts: 950
Likes: 73
From: San Diego
That rear seal needs to be replaced...the truck sat undriven in the driveway for 6 years with its huge 50 year old camper on it while the P/O slowly died...likely that inactivity did the rear main seal in.
Thread Starter
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Laughing Gas
Joined: Nov 2015
Posts: 950
Likes: 73
From: San Diego
The cam is an unlikely cause on a well used engine, your crappy distributor is more likely it. but a bent push rod, bad lifter or valve can cause a similar effect.
Check your plugs and see if they're all firing. check your timing and for vacuum leaks. if everything checks out do a compression check.
Check your plugs and see if they're all firing. check your timing and for vacuum leaks. if everything checks out do a compression check.
He took this truck from San Diego to Idaho and back most years on a hunting trip. Its huge cab over camper kept it driveway bound except for every v 12 weeks for a drive to his work.
I had to replace the in cab gas tank,fuel pump and have the motorcraft 2v carburetor rebuilt due to bad gasoline in 2018 when it became mine. It has 87k now.
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