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Home > Technical > Throttle body noise ..replacement !! |
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jules Member Since: 13 Dec 2007 Location: The Wilds of Warwickshire Posts: 5062 |
The plastic gears fail. You can buy repair kits for £30.
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31st Jan 2022 5:03 pm |
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dorsetfreelander Member Since: 20 Jul 2013 Location: Dorset Posts: 4354 |
I have had a few FL2s and the throttle body always makes a whining noise for a few minutes when you switch off. Sometimes its a few seconds and other times 5 minutes or more. I would leave it alone and live with it. I have only had one fail and need replacing. 3 x FL1 2 manual + 1 auto
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31st Jan 2022 6:19 pm |
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I Like Chips Member Since: 25 Jun 2017 Location: Ascott Under Wychwood Posts: 1545 |
They do make a noise after engine switch off, Its resetting its self.
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31st Jan 2022 6:50 pm |
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Nodge68 Member Since: 15 Jul 2020 Location: Newquay Posts: 2082 |
The TB is supposed to have a calibration routine run, after a replacement is fitted. Mine had be replaced before I got it, but I had a dip in power as I changed gear. However after I ran the calibration routine using SDD, the dip in power on the gear change went away, so presumably the uncalibrated TB wasn't opening fast enough, when power was required after I'd changed gear. Hyundai Ioniq 5 Ultimate. The family car.
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31st Jan 2022 7:45 pm |
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BossBob Member Since: 30 Sep 2010 Location: Bristol Posts: 1402 |
The throttle body on a diesel should only come into play when you stop the engine when it closes to restrict air to the engine, stopping the engine from running running on if it fuels itself from excess oil. It doesn’t play any part in the fuel to air ratio in a Diesel engine as it does in all petrol fuelled engines. |
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31st Jan 2022 10:16 pm |
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jules Member Since: 13 Dec 2007 Location: The Wilds of Warwickshire Posts: 5062 |
@ Bossbob
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1st Feb 2022 12:14 am |
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BossBob Member Since: 30 Sep 2010 Location: Bristol Posts: 1402 |
No, my 2007 TD4’s throttle body wines and clicks as the flap resets once the engine has stopped, and has since I bought it. |
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1st Feb 2022 6:29 am |
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meatloaf Member Since: 17 Dec 2013 Location: birmingham Posts: 43 |
Thanls all ...I agree , Yes a whine is normal with a few clicks for a few seconds after shut down, but mine is making rather more nose than that albeit randomly than that normal bit, I have no engine run on ..and all seems OK apart from noise ...but just was going to replace to avoid any break down ... still not 100% weather need to be set up on LR diagnostics system TBH ... |
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1st Feb 2022 9:35 am |
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I Like Chips Member Since: 25 Jun 2017 Location: Ascott Under Wychwood Posts: 1545 |
Some code readers have the option to reset the TB. On the other hand some people have said it resets it's self over time. |
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1st Feb 2022 9:51 am |
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SteveC Member Since: 11 Oct 2013 Location: St Ives, Cambs Posts: 281 |
It's the grinding and loud clicking noise that means it needs replacing, rather than the whining noise after shutdown which is normal.
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1st Feb 2022 10:01 am |
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meatloaf Member Since: 17 Dec 2013 Location: birmingham Posts: 43 |
ok all thanks for help fitted replacement and all seems fine did not do any resetting at all just fitted and started engine ..runs OK no noise ...taken old one apart and yes the gear had stripped as thought... |
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1st Feb 2022 12:40 pm |
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Nodge68 Member Since: 15 Jul 2020 Location: Newquay Posts: 2082 |
The TB's primary function on a diesel, is to ensure that EGR function is enhanced under light running conditions, in which case it will close to restrict fresh air intake, thus enhancing the amount of exhaust gasses in the intake. It's secondary function is to smooth engine running between gear changes, by closing off momentarily as the throttle pedal is snapped shut. It also closes on engine shutdown, to reduce the vibration caused by the high compression a diesel has. Shutting the throttle to prevent running on in a runaway condition is a minor consideration, and definitely not the principle reasons, it's more of a byproduct of the other reasons for its existence described above. Hyundai Ioniq 5 Ultimate. The family car. 2009 Rimini Red SE TD4. Gone. 2006 Tonga Green i6 HSE. Gone. Audi A5 convertible, my daily driver. 1972 Hillman Avenger GT, the project. |
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1st Feb 2022 8:32 pm |
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Andy131 Member Since: 09 Dec 2009 Location: Manchester Posts: 2187 |
My throttle body failed one evening after making grinding noises for weeks. The nice man from the AA rammed a big screwdriver through the butterfly - so it was permanently open. Ran like this for weeks until I eventually got around to changing it, the thing that surprised me was the car ran perfectly with a non-functioning throttle body. Now mine was an auto so possibly didn't need the air to be shut off during gear changes.
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2nd Feb 2022 10:13 pm |
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Nodge68 Member Since: 15 Jul 2020 Location: Newquay Posts: 2082 |
The main reason the TB is there, is to improve functionality of the EGR circuit, the other benefits (reducing NVH) are of minor consideration, and to most normal people, the engine would seem to run just as well without it.
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3rd Feb 2022 6:25 am |
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