motor tapping
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New User
Joined: Jan 2002
Posts: 13
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motor tapping
I have a 1978 F100 straight 6 that tapps loudly every time I give it gas. No tap at idle, and no tap while coasting...but touch the gas, and it hammers away. Is this an exaust manifold leak? Or maybe a bad valve tap? Thanks in advance for any ideas!
Senior User
Joined: Dec 2001
Posts: 105
Likes: 0
motor tapping
Assuming your timing is accurate, either diagnosis could be correct. You can use a stethescope to see if you can isolate the cylinder(s), better yet use a vacuum gauge.
Did this problem suddenly occur? Or if the truck has been sitting for a long time, sometimes a few lifters can stick. I had this problem, and an oil change with a qt. of Rislone solved it after 200 mi.
Something you can do quickly is pop the valve cover and check the valve adjustment, and anything obvious with your springs, guides, etc.
Did this problem suddenly occur? Or if the truck has been sitting for a long time, sometimes a few lifters can stick. I had this problem, and an oil change with a qt. of Rislone solved it after 200 mi.
Something you can do quickly is pop the valve cover and check the valve adjustment, and anything obvious with your springs, guides, etc.
