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Old 02-19-2020, 12:44 AM   #1
Wendigo9643
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Join Date: May 2019
Default 2004 STI sticky accelerator pedal?

Hey all, I purchased an 04 STI with ~130,000 miles a few months back. After spending quite a bit of time in the shop I finally have it back on the road. However a problem that I first noticed when I picked the car up has been bugging me and I'm not sure where I should be looking to try and diagnose and fix it.

When the accelerator is depressed even say, 1-5%, the pedal will squeak and I feel just enough resistance that I have to overcompensate in order to push the pedal past this point. This makes driving in the city pretty annoying as I'm constantly trying to avoid pushing too hard on the pedal just to get through that resistance.

My research has led me to believe it is either one of two things or some combination of both a dirty throttle body or simply that the pedal assembly is old and worn out and lacking lubrication. This issue happens regardless of whether the car is on or off, temperature, gear, etc.

Planning on taking the car up to my friends' garage to work on it this week and would love to be able to sort this one out.

Thanks.
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Old 02-19-2020, 04:02 PM   #2
Jedi03
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Location: New Mexico
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if its a cable throttle, can be cable sticking, spring on throttle body not lubricated, dirty throttle body, binding in pivot for pedal...few different ideas...
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Old 02-19-2020, 04:41 PM   #3
NickVu
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it's an electronic throttle. it's mounted via 2 allen bolts. you can unplug and remove it from the car to clean up any stickyness. if you need to grease internally, use dielectric silicone grease.
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Old 02-19-2020, 07:26 PM   #4
Wendigo9643
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NickWu your advice is in regards to the pedal assembly, correct? I figured since itís drive by wire and the issue happens whether the car is on or off, that the pedal itself is the more likely culprit.
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Old 02-20-2020, 01:46 PM   #5
NickVu
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Yes, you can remove the pedal from the car, take it apart and clean it up. Don't use bearing or lithium grease inside, only dielectric grease.
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Old 02-21-2020, 04:50 PM   #6
Wendigo9643
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Quote:
Originally Posted by NickVu View Post
Yes, you can remove the pedal from the car, take it apart and clean it up. Don't use bearing or lithium grease inside, only dielectric grease.


Great, thanks for the advice!
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