# 2004 Toyota 4Runner briefly decelerates

**URL:** <https://community.cartalk.com/t/2004-toyota-4runner-briefly-decelerates/168614>\
**Category:** Maintenance/Repairs\
**Tags:** toyota, 4runner\
**Created:** [August 13, 2020, 11:27am UTC](https://community.cartalk.com/t/2004-toyota-4runner-briefly-decelerates/168614 "2020-08-13T11:27:08Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![tommy05](https://avatars.discourse-cdn.com/v4/letter/t/c68b51/32.png) [@tommy05](https://community.cartalk.com/u/tommy05)\
**Post date:** [August 13, 2020, 11:27am UTC](https://community.cartalk.com/t/2004-toyota-4runner-briefly-decelerates/168614/1 "2020-08-13T11:27:08Z")

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my truck deacclerate at 40 to 45 mph. just for a sec.

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**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\
**Post date:** [August 13, 2020, 5:22pm UTC](https://community.cartalk.com/t/2004-toyota-4runner-briefly-decelerates/168614/2 "2020-08-13T17:22:58Z")

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Is the check engine light on? If so, have the codes read and post back with the results.

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**Author:** ![lion9car](https://avatars.discourse-cdn.com/v4/letter/l/59ef9b/32.png) [@lion9car](https://community.cartalk.com/u/lion9car)\
**Post date:** [August 14, 2020, 2:31pm UTC](https://community.cartalk.com/t/2004-toyota-4runner-briefly-decelerates/168614/3 "2020-08-14T14:31:35Z")

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Your fuel pump could be dying. That can be checked by measuring the fuel pressure.

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**Author:** ![shanonia](https://avatars.discourse-cdn.com/v4/letter/s/9de053/32.png) [@shanonia](https://community.cartalk.com/u/shanonia)\
**Post date:** [August 14, 2020, 3:20pm UTC](https://community.cartalk.com/t/2004-toyota-4runner-briefly-decelerates/168614/4 "2020-08-14T15:20:26Z")

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If it has a TPS Throttle Position Sensor, it may have a small dead spot in its range of resistance. Electronic parts cleaner might fix that.

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**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\
**Post date:** [August 14, 2020, 7:47pm UTC](https://community.cartalk.com/t/2004-toyota-4runner-briefly-decelerates/168614/5 "2020-08-14T19:47:28Z")

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From what I can find it doesn’t. And wouldn’t the fuel pump act up at other speeds?

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**Author:** ![shanonia](https://avatars.discourse-cdn.com/v4/letter/s/9de053/32.png) [@shanonia](https://community.cartalk.com/u/shanonia)\
**Post date:** [August 14, 2020, 9:02pm UTC](https://community.cartalk.com/t/2004-toyota-4runner-briefly-decelerates/168614/6 "2020-08-14T21:02:29Z")

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You’d think so. The only thing that is totally speed related that could do this is the VSS Vehicle Speed Sensor, and whatever its signal goes to. Trans? ESC? Ignition timing? Fuel system?

It would help if we could be sure that some factor other than speed is at play here. Could it be a shifting problem?

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**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\
**Post date:** [August 14, 2020, 9:05pm UTC](https://community.cartalk.com/t/2004-toyota-4runner-briefly-decelerates/168614/7 "2020-08-14T21:05:59Z")

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At this point it could be almost anything. I’m out of ideas and open to suggestions.