Adjust throttle cable for accelerator feel?

[Supraman]

Hey everybody. In my N/A, the accelerator is reasonably loose/unresponsive compared to other cars. It's not terrible, but because something like this seems as though it would be pretty easy to adjust, I'd like to fix it.

I've looked at the accelerator cabling connected to the throttle body, and see at least a couple points where it seems one could adjust the cable. One of them, a nut on the rod that connects to the throttle body itself, seems to be nearly impossible to turn (of course, one would have to hold the rod in place while turning the nut, but I can't manage it). The other point of adjustment appears to be before the assembly where the cruise control and accelerator cables "combine." Unfortunately, one of the possible adjustment nuts here also seems very difficult to turn (mostly due to position).

Where, and how, can I adjust this? I apologize for the simple question, but my knowledge of Supras is only extensive book-learned material, not simple situations like this that occur in reality :icon_roll Indeed, I have looked through and searched PDF files of the TSRM, and found nothing relevent to this adjustment.

Thanks everyone,

-- Scott Goodson

 

[kamil]

I guess its different on the NA but I know the turbo model has a spot on the linkage bracket where the accelerator cable sits in a "groove" with a nut on either side; adjusting these nuts brings it forward or back, tightening or loosening the slack in the throttle cable.

 

[Supraman]

Alright, I've gone ahead and taken some pictures, because I'm still dumbfounded as to how to do this. It seems as though it would be extremely straightforward, but at least for me, that's not the case. Take a look at these:

I could be missing something, but it just seems as though the adjustment I need is not present here. The only nut I found that might be able to adjust anything at all seems to be stuck, but even if it was not, it does not seem to be the best adjustment to make anyway. Indeed, I need exactly one thing--in effect, the throttle cable to be shorter. There's some gap here, as shown, but there's an even larger gap at the pedal itself. The total gap must be around 3/4", which is a far cry from a tight-feeling throttle assembly. Surely there must be a way to fix this, but does anyone know how to do so on a non-turbo? If it's easy enough (as it must be...right?), I bet plenty of Supra owners could benefit from a little tightening.

Thanks again,

-- Scott Goodson

 

[mkiiSupraMan18]

I stole one of those umm.... "bar things" off of one of my MKII's... If you were to make that shorter, and pull the slack out of the cable that way it may help. Short of changing out the cable, I wouldn't know what else to do... I also am not going to promise that shortening the "bar" won't just raise the idle speed rather than pull on the cable.
Typing this out is much harder than I thought. I got quite a few of these little buggers if ya need one. Hope this helps, in some way.

Edit:
Actually, now that I think about it... lol... I had to make mine longer because it WAS idling too fast, and wouldn't pull itself back far enough. It may still be worth a try, however.

 

[Boostedstr8six]

I think you are just being too easy on the adjustment fasteners. You know what needs to be adjusted but you haven't broken the fasteners loose. Your first pic shows the easiest adjustment location.

 

[kamil]

These are the nuts you need to loosen and screw/unscrew to adjust the throttle cable freeplay...

 

[souprat]

my soop had the same problem, the cable had streched and there was like an inch and a half of travel by the pedal before it would engage the throttle. i fixed it the ghetto way. i took a piece of silicon hose and streched it over the throttle cable near the peddal. the hose acts like a spacer taking up the slack. i know there is a better way to do this but my way worked fine. cant tell the difference from the drivers seat.

 

[Jeff Lange]

When I checked mine, it was simple, I adjusted it in 2 places, I adjusted the rod, as well as tightened the cable. If a nut is stuck, that would suck, but I had no problems.

 

[Squid699]

you can take out a lot of slop by adjusting the cable and the rod if you can't get enough adjustment with the cable alone. My throttle had way too much free play, now it's nice and crisp!

 

[Supraman]

Well, when I was looking over the system, I was expecting some sort of way to adjust where the end of the cable attached to the throttle system, al la bicycle brakes/gears. When I saw the nuts and rods connecting the cables to some sort of post, I just assumed it was a pecuiliar way to fasten the cables to something so they would be under tension. However, I later discovered (just before reading these posts) that indeed adjusting both nuts simultaneously will tighten the cable, in effect (by moving the cable farther away). I did this, and took the rod to its full extension limit, and now the accelerator is worlds more responsive than before--the difference is much more pleasing than I expected! It could still be tightened a bit more in overall feel, but I think basically all remaining freeplay is due to the lame angle-adjusting pedal on these things.

Problem solved! Thanks for your help :icon_wink

-- Scott Goodson

 

[Cedrock15]

bump, great thread just fixed mine b/c of the help from those above. The one nut on the acclerator cable did most of the job. I have alot less slack, the rod nut i adjusted didnt do anything because nothing slid because of it moving. I must of missed somethign else on the rod

 

[Nick M]

If there is one thing that stands out for the Supra when I let people drive it, it is the stiffness of the accelerator pedal. The return spring is stiffer than a wedding dick.

If yours is really loose, it has an issue.