Tapping noise from Engine (1 Viewer)

Joined
Feb 6, 2021
Messages
8
Location
Pennsylvania
So i picked up a '97 lx450 dirt cheap on a whim and have been fixing some smaller issuse but the main issue i havnt yet tackled is the engine noise. Id call it a tapping, present at all times, sometimes barely noticeable, sometimes quite loud, increases with rpm. Seems to be from top end, towards the rear. Also worth noting, engine has normal power till it warms up, after that its probably the slowest vehicle ive ever driven. I havnt had the time to tear it down yet and i am unfamiliar with this particular engine. Any ideas or insight would be greatly appreciated. Im hoping its something simple. Thank you
 
Joined
Feb 6, 2021
Messages
8
Location
Pennsylvania
I'll post a video in the morning. 195k miles. I changed the oil soon as i got it, cut the filter open, no signs of debris. Tried ruling out bottom end. Valve cover gasket has cleary been leaking for a while, from cover caked with oil n dirt as well.
 
Joined
Feb 6, 2021
Messages
8
Location
Pennsylvania
Update: Was also in the process of replacing rear axle seals so had to finish that first. Removed all belts today, noise is a little different now. Video attached.
 
Joined
Feb 6, 2021
Messages
8
Location
Pennsylvania
I did find the exhaust leaking where the rear manifold connects to the y-pipe. Are these engines prone to valve train issues/ require adjusting?
 
Joined
Jun 17, 2018
Messages
176
Location
Colorado
The 1FZ-FE is a 100k schedule for valves, I believe. I have the 3FE, and is specified at every 15k.
I highly encourage you to get a copy of the FSM. It will save you lots of frusteration and give you answers to questions and guidance to troubleshooting.
Cheers!
 
Joined
Feb 6, 2021
Messages
8
Location
Pennsylvania
The 1FZ-FE is a 100k schedule for valves, I believe. I have the 3FE, and is specified at every 15k.
I highly encourage you to get a copy of the FSM. It will save you lots of frusteration and give you answers to questions and guidance to troubleshooting.
Cheers!
Ive held off on investing in the manual as wits end is out of stock and it appears they go for $170+ otherwise. Truth be told i havnt decided if im keeping the vehicle yet. My fear is this engine noise will become a very expensive rabbit hole. I appreciate the info tho, thank you kindly.
 

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