Piston slap
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Senior User
Joined: Mar 2007
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From: Montana
Piston slap
I have a 97 f150 4.6 with 91000 on it. It has always had a knocking noise for a couple of seconds when I start it up on a cold day. Recently the noise has been constant even after warm up. I have changed the oil every 3000 miles. I was wondering if using a thicker oil or an oil additive would help quiet the noise. I think stp or luccas would thicken the oil but I thought I would ask if anyone has had this problem. Any advise would be great.
Thanks
Budman
Thanks
Budman
Thread Starter
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Senior User
Joined: Mar 2007
Posts: 440
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From: Montana
I'm not sure. The noise is definitly coming from the drivers side of the engine. It sounds like someone is hitting the block with a heavy object. I think if it was a rod bearing the sound would be coming from the bottom and would be just as load on the passanger side. I will listen again and see if maybe its an exhaust leak. Thanks for the reply.
I did read a thread on another forum that the owner had this problem and added marvels mistery oil and the problem went away. I may try this. marvels would thin the oil. Any more ideas out there ?
Budman
I did read a thread on another forum that the owner had this problem and added marvels mistery oil and the problem went away. I may try this. marvels would thin the oil. Any more ideas out there ?
Budman
