Jumping Tach only when freezing temps outside
01-17-2016, 04:12 AM
#1
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Jumping Tach only when freezing temps outside
Got a 93 prelude. Remote start works fine and Tach is fine when first drive. Have to drive interstate partly to work. When I get off, the first stoplight I stop at my Tach is reving up almost 1000 rpms up and down. Kinda feel a pull when I slow down to take a turn as well.
What is causing this? Like I said, it only happens when its really cold outside. It was -1 degrees this morning.
Thank you for any info.
What is causing this? Like I said, it only happens when its really cold outside. It was -1 degrees this morning.
Thank you for any info.
01-18-2016, 06:40 AM
#2
Honda-Tech Member
Re: Jumping Tach only when freezing temps outside
You could have a dirty Idle Air Control valve that freezes on the highway and when you slow down enough to engage the idle circuit, the frozen valve has trouble moving.
The throttle body can also ice up and prevent the throttle plate from properly closing and causing high idle.
The throttle body can also ice up and prevent the throttle plate from properly closing and causing high idle.
01-18-2016, 09:57 AM
#3
Honda-Tech Member
Re: Jumping Tach only when freezing temps outside
Got a 93 prelude. Remote start works fine and Tach is fine when first drive. Have to drive interstate partly to work. When I get off, the first stoplight I stop at my Tach is reving up almost 1000 rpms up and down. Kinda feel a pull when I slow down to take a turn as well.
What is causing this? Like I said, it only happens when its really cold outside. It was -1 degrees this morning.
Thank you for any info.
What is causing this? Like I said, it only happens when its really cold outside. It was -1 degrees this morning.
Thank you for any info.
You could have a dirty Idle Air Control valve that freezes on the highway and when you slow down enough to engage the idle circuit, the frozen valve has trouble moving.
The throttle body can also ice up and prevent the throttle plate from properly closing and causing high idle.
The throttle body can also ice up and prevent the throttle plate from properly closing and causing high idle.
01-19-2016, 05:59 AM
#5
Honda-Tech Member
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