Do Not Sell My Personal Information Jump to content


Any idea what this noise is?


Recommended Posts

Hi all,

My car keeps making this intermittent noise as per video (between the 15-21 second marks), sounds kinda like a railway carriage clacking over joins in the track.

Any ideas? Loose/damaged cam chain? Imminent engine death? Wasps?

Also yes I know the engine bay needs a clean...

  • Confused 1
Link to comment
Share on other sites



Sounds like the variable emissions reduction system to me, according to google its a known problem easily fixed by installing a Hydrogen torque system behind the flux capacitor. Once installed run on electric for 1 hour every 20 hours driven Wala. Should sort it. 

 

Yeah Im talking poo, but I hope you manage to get to the bottom of it.  

Link to comment
Share on other sites


18 hours ago, ColinBarber said:

Difficult to tell but worth looking around the exhaust manifolds for cracks - does it happen more when cold, when you rev etc?

Certainly not bad like this:

 

I had cracked manifolds on mine, this isn’t the same type of noise, manifolds are noisy on start up and quiet down after a few moments as the metal expands…….one of my branches was completely snapped and only held in place due to the bolts, hopefully it’s not to expensive to rectify 🤞🏻

Link to comment
Share on other sites

Thanks for the help guys, looks like I've managed to find the issue.

Came across this 6 year old vid of a guy with the same sound:

Which amazingly was still getting comments even four years later including from a Lexus tech who identified the issue.

It's a known issue with the left side timing chain tensioner on the ISF, GSF, RCF and many other Lexus with a UR series engine, they addressed it in Technical Service Bulletin EG-0031L-0516 (PDF attached) back in 2016 and replaced the part with a better designed one however the fix was never implemented on future ISFs as it was no longer on sale, and they didn't issue a recall as it's more of an annoyance than a problem (hence the guy in the above video having it for four years until he had it fixed).

So a ~£50 part and 7 hours labour, I wonder how much my local Lexus dealership are going to charge 😛

4b615dae112b39d84e0368a831eca731.pdf

  • Like 3
Link to comment
Share on other sites

Excellent find my man! And bear in mind you don’t have to pay Lexus dealer rates if you have a known specific job (with supplied genuine parts) you can go to any established engine rebuilders.

Link to comment
Share on other sites

Hi ubersonic, what mileage is your engine in your ISF? Has it just started doing this? Is it just a high mileage related issue?

I wonder if the revised RCF engine doesn't have this potential problem as tensioners are improved where needed?

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...




Forums


News


Membership