2011 LR4 Engine Knock Idling
Hi, been a while since I posted here. I have a 2011 LR4 , 188,000km. I've had it for 5 years since 133,000km. My research showed the timing chains were completed before I bought it at a reputable dealer in the Toronto area. The engine has always been strong and I have changed the oil frequently. I also added a Liquid Moly fuel cleaner about a year ago. The engine sounds pretty good, until I get the knock. To me it comes from the area of the Fuel Pumps. I thought it might be the tensioner in the oil pump/ fuel pump chain in the sump. But it is intermittent, shows up at idle (drive thru's are typical when you can hear the engine reflecting noise off the wall with your window open). It has been there since I got the car. It has bugged me but is yet to cause any failure. I'm not really answering the question as I have not solved the problem but just wanted to highlight that it's been there since I owned the vehicle (over 50,000km now). I get good fuel pressure and the engine is strong and revs freely.
It can be quite loud and disconcerting, nevermind the loss of credibility lol. Has anyone replaced the fuel pumps?
I just remembered, today I was changing the oil and the knocking started when I was heating the engine. Because I had the engine cover off, I actually put my finger on the fuel rail and I could feel the knocking vibration. Not sure if that's a clue!
It can be quite loud and disconcerting, nevermind the loss of credibility lol. Has anyone replaced the fuel pumps?
I just remembered, today I was changing the oil and the knocking started when I was heating the engine. Because I had the engine cover off, I actually put my finger on the fuel rail and I could feel the knocking vibration. Not sure if that's a clue!
Recovery Vehicle
Joined: Apr 2019
Posts: 959
Likes: 214
From: Ottawa, Canada
FWIW, the mechanical HPFPs on my 40 yo marine diesel are much louder. And immensely dependable.
It is nothing to worry about. In fact it makes me grin as its "old school". But I do only use highest grade fuels.
See: https://www.toptiergas.com/gasoline-brands/
Equally, preventative maintenance is paramount. I change oil and filter every 5000 km. Causes for the premature wear have highlighted areas of concern like oil starvation, oil oxidation and contamination.
As I shared in another post, in another forum, I personally know of an F150 with essentially the same engine at 325,000 km, never needing any kind of involved repair or rebuild. It is a work truck being driven hard. And maintenance is key.
Cheers.
It is nothing to worry about. In fact it makes me grin as its "old school". But I do only use highest grade fuels.
See: https://www.toptiergas.com/gasoline-brands/
Equally, preventative maintenance is paramount. I change oil and filter every 5000 km. Causes for the premature wear have highlighted areas of concern like oil starvation, oil oxidation and contamination.
As I shared in another post, in another forum, I personally know of an F150 with essentially the same engine at 325,000 km, never needing any kind of involved repair or rebuild. It is a work truck being driven hard. And maintenance is key.
Cheers.
Last edited by guy; Nov 28, 2024 at 10:16 AM.
3rd Gear
Joined: Nov 2024
Posts: 3
Likes: 0
I don’t own a LR but a 12 XKR 5.0L Jag…. Same engine same problem…. Ticking on warm restart the worst.
when I start my car cold it’s not there. If it was a loose timing chain tensioner you would hear a cold start chatter…. I know I had one!
this noise comes after maybe 5-10 min at a stop light and you hear it inside the car. The. By the 3rd or 4th stop light trying to get on the freeway is improved or gone.
i watched a video about the HPFP system on these engines and the guy talks about how awful it is… “your gonna get excess noise and it’s coming from the Hpfp lower right side…. Your gonna be replacing these In pairs”
Here is the main issue we are having. I’ve not seen one person comment they replaced their HPFP, cam followers, and HPFP rails with resulting improvement or cure? Has anyone actually done this? I know I have not but have the parts on order for my indie to get done..
when I start my car cold it’s not there. If it was a loose timing chain tensioner you would hear a cold start chatter…. I know I had one!
this noise comes after maybe 5-10 min at a stop light and you hear it inside the car. The. By the 3rd or 4th stop light trying to get on the freeway is improved or gone.
i watched a video about the HPFP system on these engines and the guy talks about how awful it is… “your gonna get excess noise and it’s coming from the Hpfp lower right side…. Your gonna be replacing these In pairs”
Here is the main issue we are having. I’ve not seen one person comment they replaced their HPFP, cam followers, and HPFP rails with resulting improvement or cure? Has anyone actually done this? I know I have not but have the parts on order for my indie to get done..
have you had your HPFP’s replaced? Did the noise go away? I’m also living with that annoying noise, and willing to replace the pumps, if that’s the cure.
Thank You
1st Gear
Joined: Feb 2025
Posts: 1
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