I'll take you up on that offer, I have just removed the screw and it's always been a little too light for my liking.
Stiff / Sticky accelerator pedal (2004)
- Thread starter Cruiserhead05
- Start date
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After 3 years of living with a notchy accelerator pedal i decided to try and improve the situation. I followed the tips KrispyKritter posted above, but wanted to add some pictures and notes to the thread.
This took about 40 minutes to complete.
-10mm socket, short extensions, and a socket thumb wheel (makes quick work of the top mounting bolt). I don't see the need for universal joints.
-two small flathead precision screwdrivers, one Phillips head, assortment of picks helped as well
-6mm ( i think) wrench or socket for the throttle sender unit.
-8mm socket for the throttle dampener anchor screw
-PTFE Teflon based silicon grease
-paint pen
I'll start with the throttle unit removed and ready to go on your bench. Follow the instructions previously posted to get to this point.
1. Remove the pedal lever return spring from throttle rod ( hooked end) with a big flathead screwdriver
2. You cannot remove the throttle pedal shaft from the housing without first removing the throttle position sender. The sensor gets indexed on slots. A paint marker is your friend, make sure to mark the position of the sender unit before removing. .
3. Remove the circlip holding the pivot point shaft inside the dampener and housing assembly. The shaft will then pull out of the plastic collar with a gentle tap. Remove the dampener anchor bolt from the c-clip side of the pedal housing. The dampener can now be removed from the pedal housing
This took about 40 minutes to complete.
-10mm socket, short extensions, and a socket thumb wheel (makes quick work of the top mounting bolt). I don't see the need for universal joints.
-two small flathead precision screwdrivers, one Phillips head, assortment of picks helped as well
-6mm ( i think) wrench or socket for the throttle sender unit.
-8mm socket for the throttle dampener anchor screw
-PTFE Teflon based silicon grease
-paint pen
I'll start with the throttle unit removed and ready to go on your bench. Follow the instructions previously posted to get to this point.
1. Remove the pedal lever return spring from throttle rod ( hooked end) with a big flathead screwdriver
2. You cannot remove the throttle pedal shaft from the housing without first removing the throttle position sender. The sensor gets indexed on slots. A paint marker is your friend, make sure to mark the position of the sender unit before removing. .
3. Remove the circlip holding the pivot point shaft inside the dampener and housing assembly. The shaft will then pull out of the plastic collar with a gentle tap. Remove the dampener anchor bolt from the c-clip side of the pedal housing. The dampener can now be removed from the pedal housing
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4. Remove the small plated screw holding the dampener cap in place ( sorry forgot to photo that). Now for the fun part.
The cap has indentations for whatever assembly tool they used to screw it on. The cap is threaded. Ideally someone would find a similar sized die that fits the recess and try to unscrew the cap. I didnt. as was previously described, removing the cap gets ugly. Hint, there are 3 recesses on the cap youd need to work around with a thin flat ( but strong) prying tool. Choose your precision flat blade wisely. The cap will eventually start to lift. Paint mark the hole for the cap screw, it'll be unrecognizable when you're done.
a savaged dampener cap
5. Heres the smoking gun. The cam function of the dampener is on the far right on the cylinder, right under the cap. Two ramped surfaces are forced together under spring tension with the white ramp collar traveling on groves molded into the cylinder housing.
The white ramps were probably at one point, a slick Delrin like type of material. By now its bone dry and you can see it grind into powder on its facing ramps
6. Clean it out and lube it up. All channels, mating surfaces etc. Use P for plenty. Its important to choose a lubricant that is viscous and tacky as well. The stuff i used was as messy as model glue. Hopefully itll keep doing its job for years to come,
Finally, re-assemble using a suitable socket to tap the dampener cap back in place. Also make note that the pivot rod bushings have square edges and only go in the housing a certain way. Enjoy being able to modulate your throttle pedal like Mr.T intended.
The cap has indentations for whatever assembly tool they used to screw it on. The cap is threaded. Ideally someone would find a similar sized die that fits the recess and try to unscrew the cap. I didnt. as was previously described, removing the cap gets ugly. Hint, there are 3 recesses on the cap youd need to work around with a thin flat ( but strong) prying tool. Choose your precision flat blade wisely. The cap will eventually start to lift. Paint mark the hole for the cap screw, it'll be unrecognizable when you're done.
a savaged dampener cap
5. Heres the smoking gun. The cam function of the dampener is on the far right on the cylinder, right under the cap. Two ramped surfaces are forced together under spring tension with the white ramp collar traveling on groves molded into the cylinder housing.
The white ramps were probably at one point, a slick Delrin like type of material. By now its bone dry and you can see it grind into powder on its facing ramps
6. Clean it out and lube it up. All channels, mating surfaces etc. Use P for plenty. Its important to choose a lubricant that is viscous and tacky as well. The stuff i used was as messy as model glue. Hopefully itll keep doing its job for years to come,
Finally, re-assemble using a suitable socket to tap the dampener cap back in place. Also make note that the pivot rod bushings have square edges and only go in the housing a certain way. Enjoy being able to modulate your throttle pedal like Mr.T intended.
I just documented a fix for this issue here: Sticky Accelerator Pedal - Fixed! 2004 LX470 - https://forum.ih8mud.com/threads/sticky-accelerator-pedal-fixed-2004-lx470.1360191/
I just documented a fix for this issue that doesn't maul the plastic housing: Sticky Accelerator Pedal - Fixed! 2004 LX470 - https://forum.ih8mud.com/threads/sticky-accelerator-pedal-fixed-2004-lx470.1360191/
