getafewlives

Alright, this isn't exactly for a 4.6L but it is for my 4.0L SOHC in my explorer, so it is pretty similar and a pretty general questions.

When my explorer is cold it knocks quite loudly, but still performs and runs just fine. I can't tell where the knocking is coming from but it does increase with RPMs and gets quieter as the engine warms up. I know this is a long shot, but I figured I will try one of those "magic in a can" solutions. Which would you guys recommend to quiet the engine down? Rislone? Restore? Lucas? Etc...

cliffyk

None of those will "fix" anything, however they might buy you some time...

How many miles on the Explorer, where do you live (climate)?

03BottleFedGT

Lucas oil stabilizer, magic in a bottle

getafewlives

There's 110,000 miles on the explorer. I live in BC Canada, but the explorer was brought from the US when the old owner had it. Not too sure how long ago or where from.

cliffyk

In your climate I would try using Valvoline Maxlife 10W-30 or 10W-40 engine oil--as engines age they need heavier oil; especially if they were run on 5W-20 or similar camel **** for the first 100k...

Here in Saint Augustine, FL USA I run 20W-50 Maxlife year-round in my wife's 2003 Toyota Highlander with 185k miles--it's been using that for 50k+ miles...

getafewlives

Here's a video of the engine running, in case anyone has magic ears.

http://s151.photobucket.com/albums/s...t=101_1879.mp4