Re: 1985 F150 engine knock

[ View Follow Ups ] [ Post Followup ] [ Return to Forum ]

Posted by Hal/WA on July 15, 2003 at 00:51:00 from (216.64.132.86):

In Reply to: 1985 F150 engine knock posted by jimks on July 14, 2003 at 10:55:37:

Lots of good suggestions. You might try isolating the cylinder with the problem by taking off different spark plug wires to see if the knock will go away. Or if it is an octane knock, maybe a tank of premium gas could identify that as the problem.

Once a friend had a big Ford with a 390 that made an odd noise at certain RPM's. We tinkered with that for a long time before we figured out that one of the combinations of lifter/pushrod/rocker arm/valve didn't have quite the right geometry. What we discovered was that the pushrod needed to be a little longer than the rest of the pushrods to preload that lifter the correct amount. A single adjustable pushrod fixed the problem. The engine ran a bit stronger and the worrisome noise went away. Good luck!

Follow Ups:

Post A Followup

Name:
E-Mail:
Subject: Re: Re: 1985 F150 engine knock
Comments:

Optional Link URL:
Link Title:
Optional Image URL:

Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.

[Home]