Lexus IS250 (2006) - Ticking Noise - Lexus IS250

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Tue 5 Aug 2025 20:40
Lexus IS250 (2006) - Ticking Noise - Lexus IS250 - cam1231

Hey everyone,

Looking for some input on a noise issue with my Lexus IS250.

  • Yesterday, I started noticing a ticking noise, most noticeable when the engine is at idle.

  • When I rev the engine to around 2000 RPM, the ticking seems to increase in frequency.

  • However, once I get to around 3000 RPM, it becomes much less noticeable or seems to disappear entirely.

  • Strangely, the noise was gone this morning during my first drive, but it came back again later in the day.

  • I tried to pinpoint the source and it seems to be coming from the front of the engine. While inspecting, I noticed the water pump pulley has a visible wobble, and it seems to line up with the ticking sound.

Does this sound like it could be the root cause? I've attached a video for reference.

streamable.com/735fhe

Any insights would be appreciated. Thanks in advance.

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Tue 5 Aug 2025 21:14
Lexus IS250 (2006) - Ticking Noise - Lexus IS250 - Adampr

Either way, I think you want the water pump replaced ASAP. They do wear out and those engines don't like getting hot. If that doesn't fix it, move on to further investigations.

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Wed 6 Aug 2025 12:27
Lexus IS250 (2006) - Ticking Noise - Lexus IS250 - Falkirk Bairn

If you are getting the waterpump done REPLACE the cambelt at the same time. It's the same time to put on a new belt as the old belt when it's dismantled.

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Wed 6 Aug 2025 15:19
Lexus IS250 (2006) - Ticking Noise - Lexus IS250 - Adampr

If you are getting the waterpump done REPLACE the cambelt at the same time. It's the same time to put on a new belt as the old belt when it's dismantled.

Aren't these chain driven?

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Wed 6 Aug 2025 15:29
Lexus IS250 (2006) - Ticking Noise - Lexus IS250 - paul 1963

If you are getting the waterpump done REPLACE the cambelt at the same time. It's the same time to put on a new belt as the old belt when it's dismantled.

Aren't these chain driven?

Yep! That water pump needs changing sooner rather than later, surprised its not leaking.

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Thu 7 Aug 2025 08:53
Lexus IS250 (2006) - Ticking Noise - Lexus IS250 - Falkirk Bairn

Apologies - IS 200 is belt driven

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