High Pressure Fuel Pump

sean_co · March 29, 2015

Good evening,

i have a question about the ticking sound from the HP fuel pump. if you have good speakers / headphones you can hear the sound on this video link below. you can hear the so called normal sound on the left of the engine but the recording from the right side and under the car you can hear a different clicking sound. a more pronounced one. seems to go away when you bring the revs up to about 1500 ish and it cant be the timing chain or tentioner because its heard near the back or the engine, close to the firewall.

https://youtu.be/DcQJbMCXK5A

the dealership just says its the fuel pump but i dont think it is, does not sound like the usual ticking that the is250 has.

does this sound normal?

sean_co · April 9, 2015

so the dealership has had the car for 2 days now. they say they 99% sure is a leaking exhaust manifold gasket or cracked manifold causing that sound. only happens when its at operating temperature.

in the same breath they say they saw carbon buildup in the cylinders (using a scope) and they need to strip the engine to find out what that is. 27 hours of labor quoted just for that. then a whole new exhaust system is needed also (because the back CAT were removed) to fix the sound im complaining about. i am completely loosing faith in Lexus. they complained about a "chip in the engine" also, that's the device from PPE keeping my CEL off. R21,000 to strip and check the engine and another R35,000 for the exhaust system. i have paid less for running vehicles before.

it seems all these guys want to do is drop and strip the engine or replace things that are not even relevant. i would not be surprised if they quote an ECU just for good measure. im going to pick up my car from the dealership and take it to an exhaust place.

Stuno1 · April 9, 2015

Feck! Do you have warrenty? Most dealers seem to just replace parts as opposed to doing a proper check to diagnose an issue. If you have no warranty I would be asking for a second opinion and/or visiting an exhaust specialist.

On the lotus forum a chap was quoted 10k for a new gearbox but with persistence and this was found to be a 50 quid filter change in the gearbox once inspected properly!

sean_co · April 9, 2015

Feck! Do you have warrenty? Most dealers seem to just replace parts as opposed to doing a proper check to diagnose an issue. If you have no warranty I would be asking for a second opinion and/or visiting an exhaust specialist.

On the lotus forum a chap was quoted 10k for a new gearbox but with persistence and this was found to be a 50 quid filter change in the gearbox once inspected properly!

unfortunately i dont have warranty left on this car. im sure in time i will either find the issue or find someone that can find it. i have just come back from an exhaust place, they listened and blipped the throttle a bit while listening and they saying its not coming from an exhaust leak they also saying it does not sound like tappets / lifters.

i can believe that story from the lotus forum. you probably find the place quoting 10k knew all along it was just the filter and was going to pocket the rest of the cash.

Stuno1 · April 9, 2015

Oh ok. So some progress made. Maybe try a different Lexus garage?

sean_co · April 10, 2015

https://www.youtube.com/watch?v=Tnibd6Av59Q

https://www.youtube.com/watch?v=11p5ikcktjI

i found these 2 videos on youtube. seems to exactly the same sound happening there.

Stuno1 · April 10, 2015

Interesting, can't fuel pump replacement just resolve the issue? Sounds like something is loose and knocking or maybe lubricant is needed as its on a rotation by the sounds of it?

What have Americans said on their forum?

Stu

sean_co · April 10, 2015

Interesting, can't fuel pump replacement just resolve the issue? Sounds like something is loose and knocking or maybe lubricant is needed as its on a rotation by the sounds of it?

What have Americans said on their forum?

Stu

have not checked on usa forums at this point. not an easy sound to pinpoint, is seems to be in the region of the high pressure pump

will register on their site and see what they say about this.

Stuno1 · April 10, 2015

A lot more sold out there so more info in general.

Stu

sean_co · April 10, 2015

Thanks Stu

if there is any good info i get i will post it here for the UK guys

Stuno1 · April 10, 2015

Ta, cheers fella.

Let us know how you get on :)

Sam Mer · June 12, 2020

Hey Sean did you end up finding a fix for this ?

Mihanicos · June 12, 2020

Sounds and noises are difficult to locate. Try using a " stethoscope " . If it is a mechanical cause producing the noise it should get worse and more intense with time.

Replace parts when you are sure.

Do a diagnostic scan in case some DTCs do not cause any trouble codes to be registered. Always question the dealer's verdict.