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Old 03-09-2004, 11:46 AM   #1
Psydotek
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Question Tightening Throttle Cable? How to...

Does anyybody know how to tighten the throttle cable to get rid of extra slack?

(2003 Impreza WRX Sedan)

Thanks!

-Henry

[pics would be nice too if you have them, or links to them...]
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Old 03-09-2004, 12:21 PM   #2
Holypiston
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Do a search-or more searching, I remember a problem with tightening the cables? Some reason there is suppose to be some slack in the cables.
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Old 03-09-2004, 12:57 PM   #3
heffergm
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You want slack in the cables. Adjusting them is rather obvious... pop the hood and look at the throttle linkage. The cables and adjustment screws are right in front of it.

Have someone sit in the car and floor the gas pedal. Just make sure the throttle is opening and returning completely. There should be slack in the cable.
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Old 03-09-2004, 02:17 PM   #4
GMTarkin
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Why is there supposed to be slack? I just tightened mine down the other day, no slack now, No problems with this either...
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Old 03-09-2004, 02:32 PM   #5
heffergm
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There needs to be slack so there's no doubt that the throttle is releasing completely.

My car was delivered with the throttle cables WAY too tight. I've heard of several other cars delivered the same way, with problems similar to what I experienced: in traffic, after a lot of stop and go, engine idle would slowly and steadily rise as if possessed, until I was sitting in traffic idling at 2000 rpms. Not good.

I tracked the problem down to the throttle cables. They apparently tighten up a bit when hot, allowing the throttle to hang open.

There's zero reason to have them completely tight.

Do this:
Loosen them up so there's some noticeable slack. Have someone sit in the driver seat and floor the gas pedal. You'll see that the throttle still opens all the way.
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Old 03-09-2004, 02:47 PM   #6
Psydotek
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I know there's supposed to be a bit of slack, but i'm just a little concerned since lately my heel-toe technique isn't working very well. I've been having to blip the throttle deeper/longer to rev match properly. I've also been doing alot of fast WOT throttle blips when double clutching my downshifts.

I'm just afraid the throttle cable might have been stretched out a bit.

The problem isn't severe, just a minor nuance that i've noticed lately.
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Old 03-09-2004, 07:26 PM   #7
Psydotek
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Well, i just went out and checked the slack on the throttle cable... There was over a 1/2" of slack when you pushed the cable side to side. Adjusted it a bit and now there's a little over 1/4" of slack and the throttle response is back to normal.

Edit: Evening test drive (went out to get gas)... Holy $#!& Wow, the car is all of a sudden [even more] exciting to drive again. The engine revs up exactly when i want it to, no more accelerator slop or pressing the gas pedal and waiting half a second for the engine to rev. Best part is no more bogging when shifting gears and letting out the clutch either since the revs are already starting to climb when the clutch engages (before i'd press the accelerator and let out the clutch and the clutch would grab before the engine would be reving up = clutch shudder/bogging...)



[/me is happy all over again]

Last edited by Psydotek; 03-10-2004 at 12:09 AM.
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Old 03-10-2004, 12:10 AM   #8
Psydotek
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[bump for above edit...]

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Old 03-10-2004, 12:55 PM   #9
Charlie-III
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You need a bit of slack so it dosen't get too tight when the cable gets COLD.
Steel expands (gets longer in this case) when it gets hotter. So, a little slack when it is cold out gives a bit more slack when it is hot.
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Old 05-25-2005, 01:11 PM   #10
Gunner
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There are 2 knots on the throttle cable, one closer to the front of the car and the other towards the cabin. Which one should I turn to adjust the cable? I loosened the one towards the cable and adjusted the one towards the front but couldn't tighten it. Not having a wrench/clamps mini enough to turn it didn't help... Like this:

[Cabin]

|
|
___
| |
---
|
___
| |
---
|
|

[Front of Car]
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Old 05-25-2005, 01:16 PM   #11
Psydotek
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Loosen the front nut. Then adjust the rear nut to tighten/loosen the throttle cable. Then tighten the front nut.
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Old 05-25-2005, 04:12 PM   #12
Gunner
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Thanks!
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Old 05-28-2005, 04:12 AM   #13
GravelRash
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Quote:
Originally Posted by Charlie-III
You need a bit of slack so it dosen't get too tight when the cable gets COLD.
Steel expands (gets longer in this case) when it gets hotter. So, a little slack when it is cold out gives a bit more slack when it is hot.
Except that the cable doesn't exist as a separate entity - it's inside the cable housing.

In most cases the housing lengthens more with heat than the cable itself, thus resulting in less slack in the cable when hot.
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Old 05-28-2005, 02:17 PM   #14
Psydotek
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^^^It's true. Best bet: Adjust the cable while the engine is hot.
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