# Engine, transmission or muffler problem?

**URL:** <https://community.cartalk.com/t/engine-transmission-or-muffler-problem/25859>\
**Category:** Maintenance/Repairs\
**Tags:** transmissions, engines\
**Created:** [February 1, 2009, 1:57am UTC](https://community.cartalk.com/t/engine-transmission-or-muffler-problem/25859 "2009-02-01T01:57:29Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![liuchen](https://avatars.discourse-cdn.com/v4/letter/l/7ba0ec/32.png) [@liuchen](https://community.cartalk.com/u/liuchen)\
**Post date:** [February 1, 2009, 1:57am UTC](https://community.cartalk.com/t/engine-transmission-or-muffler-problem/25859/1 "2009-02-01T01:57:29Z")

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I have a 1998 Toyota Sienna minivan and it has ~155k miles. It was running great until recently. In the past one or two months, when I put on gas pedal, I hear a loud continuous noise that I never heard before. It seems to come from front. When I take my foot off the pedal, the noise goes away. It appears to shift gears up and down OK. What are the problems? engine, transmission or muffler?

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**Author:** ![rocketman](https://avatars.discourse-cdn.com/v4/letter/r/eada6e/32.png) [@rocketman](https://community.cartalk.com/u/rocketman)\
**Post date:** [February 1, 2009, 3:27am UTC](https://community.cartalk.com/t/engine-transmission-or-muffler-problem/25859/2 "2009-02-01T03:27:13Z")

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Probably need a bit more info in order to diagnose this one. Rocketman

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**Author:** ![Joseph\_E\_Meehan](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joseph_e_meehan/32/21_2.png) [@Joseph\_E\_Meehan](https://community.cartalk.com/u/Joseph_E_Meehan)\
**Post date:** [February 1, 2009, 11:25am UTC](https://community.cartalk.com/t/engine-transmission-or-muffler-problem/25859/3 "2009-02-01T11:25:32Z")

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Just the word “noise” does not really tell us much. Could you describe it? Could it be a heat shield ?

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**Author:** ![andrew\_j](https://avatars.discourse-cdn.com/v4/letter/a/91b2a8/32.png) [@andrew\_j](https://community.cartalk.com/u/andrew_j)\
**Post date:** [February 1, 2009, 12:25pm UTC](https://community.cartalk.com/t/engine-transmission-or-muffler-problem/25859/4 "2009-02-01T12:25:55Z")

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To eliminate transmission while in park or neutral rev the engine and see if noise is still present or not.

Describe the noise.