atikovi
Well-Known Member
- Joined
- September 3, 2002
- Messages
- 127
- Reaction score
- 13
- City, State
- Mclean VA
- Year, Model & Trim Level
- 2015 PIU
I have a 70,000 mile ‘01 with the 4.0 SOHC engine. After it is started it has what sounds like top end engine noise. This lasts for 3 or 4 minutes when cold to less than 2 minutes when warm depending on how long since it was last on. I got the truck recently and noticed that it has a lot of sludge under the valve cover. Could the hydraulic lash adjusters not pumping up cause this noise because they may be partially obstructed? Ditto about the hydraulic timing chain tensioners. Could they not pumping up cause a loose timing chain and also make a similar noise? I used an engine flush and it seemed to help a little so I may try it again. Should I replace the tensioners first as they are the easiest to get to? The oil gauge goes right to the middle of the gauge when started so pressure is not a problem.