98 f150 engine knocking????
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Joined: Jan 2004
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98 f150 engine knocking????
I have a 98 f-150 with 150k miles. Alot of miles but I have never had a single problem. I drove it sat.and it ran great, but when I started it sun. there was a loud knocking. When I press the gas it got louder and faster knocking. Does anyone have a clue what it may be???
Senior User
Joined: Jul 2002
Posts: 132
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From: Lynnwood
I have heard of that happening alot with the 4.2
Read around on this page, It will tell you alot about the engine.
https://www.ford-trucks.com/forums/f...?s=&forumid=50
Read around on this page, It will tell you alot about the engine.
https://www.ford-trucks.com/forums/f...?s=&forumid=50
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
OH NO, Not coolant in the cylinder I hope.
Have you had to add coolant to the tank lately?
www.leakingfords.com would be a good plase to start.
Jimmy
Have you had to add coolant to the tank lately?
www.leakingfords.com would be a good plase to start.
Jimmy
Junior User
Joined: Jan 2004
Posts: 64
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From: iowa
I have '99 with 4.2l. I have had the problem also. It seams to happen on damp cold days.I read somewhere they called it piston slap.It mainly happened when I drove short drives around town, then the following morning it would happen. I would shut it off and restart engine and it went away everytime. I put new wires and plugs in at 90k and it helped. It has happened since, but if i baby it for few blocks, it will go away.
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