Piston Slap?

DUNE RCR · Jan 6, 2016

Just a little tid bit of info quick. Ford put out a tsb back in 2002 for the oil viscosity in a majority of the ford lineup to swap to 5w20 instead of the originally recommended 5w30.

Tsb article no. 02-1-9a if you want to look it up.

This applies to our 97-02 4.6 and 5.4 expeditions and f150s.
I will say that my 2000 f150 with 5.4 seemed to run smoother as well when I switched oil grades.
The tsb has a huge list of vehicles this applies to if you want to look it up.
Just a little food for thought.

1955moose · Jan 6, 2016

I've only got 80k on my 2000. I live in the Bay Area where it never gets below 35 degrees. You guys in the cold climates, it might be worth trying the thinner oil. These are tight clearance motors. With 5.0 liter Fords and all the various nissans I've owned, not to mention motorcycles. Had never had the issues that these 4.6/5.4 liter motors have. I used to run 20/50 oil year round in my vehicles. Then again we don't drop below 37 degrees here in San Francisco. I always love when a manufacturer sends a tsb to their dealers saying it's normal for a vehicle to exibit a certain problem, rather than fix it. Remember with big company's it's easier to make you go away than pay to fix the problem.

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toms89 · Jan 7, 2016

No cam phasers on 2v motors so you can rule that out. A timing chain tensioner maybe? Hydraulic lash adjuster is another possibility I would consider. May bleed down while sitting and not fully pump up till warm.

fryguy · Jan 9, 2016

Position Slap?

A couple weeks ago I checked out the throttle cable, it was really stretched out. Only opening the throttle about 35 - 40% (I fixed it). Since then I have opened it up a few times. The noise I was hearing seems to be gone now.

Is it possible that I just had carbon built up that bad? Also ran Seafoam through it as well.

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AbbadonTD · Jan 9, 2016

You could have knocked something "worse or better" when you cleaned your throttle. my old 5.0 f150 would throw bolts when I cleaned out the throttle. I assume its the "engine shake" and that the cleaner throttle makes it bounce just a little "fiercer."

Maybe I am just cheap when it comes to motor mounts.

If you are going to come to Colorado for more than a few days, you may consider tuning your engine for our lovely elevation.

1955moose · Jan 9, 2016

Were sending some of our fog over to Colorado from San Fran, your air will be nice and dense soon!

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1955moose · Jan 9, 2016

Boy I thought I was the only one that had weird things happen to them working on vehicles! A loose throttle cable causing a cold start engine knock is one for the books!

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fryguy · Jan 9, 2016

Wasn't loose, it was just stretched out. Only opening the throttle 35 - 40%. Was like a day & night difference in power.

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1955moose · Jan 9, 2016

That was causing your cold start knock?

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fryguy · Jan 9, 2016

No, read the past post's...

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Piston Slap?

DUNE RCR

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