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S4 Intermittent High Idle when driving

1710 Views 6 Replies 4 Participants Last post by  petemon
Intermittently when I'm driving my S4, the idle won't drop down below 2k rpm. Happened last night, the first 10 minutes of driving was fine, then as I shifted and drove through back roads and stopped at lights etc, the idle wouldn't drop below like 1900rpm. After about ten minutes of that, it went back to normal and was fine the rest of the ride. I even tried to reach down and pull the gas pedal up like maybe it was sticking, but no change. Oh and I do have the throttle jack disabled and removed, and I did not get a check engine light. Not sure if it's mechanical like the cable is somehow sticking sometimes or if it's maybe the butterflies sticking? Or maybe it's a normal condition that can sometimes occur. Thanks in advance for any comments.
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+1 on cable adjustment.
It took me a long time to get everything right, I was amazed by how much the cable tightened up after the engine was fully warmed.
There are 4 adjustment points that all need to be in the correct balance...

Cable adjustment at the throttle body
Cable adjustment near the pedal
Pedal "Up" travel stop bolt
Pedal "Down" travel bolt (I removed mine altogether for max legroom)

The trick was to set the up and down limits to allow enough deflection for 0-100% throttle, plus a little extra, then work the cable adjusters so I could get 100% throttle with the engine hot without causing undue strain...very finicky.

My car was missing the heat shield over the cable when I got it. I replaced it and found that it does help decrease the heat expansion a little.

I also added a (4" long) piece of PEX tubing to the end of the adjuster near the pedal to reduce friction from rubbing on carpet. I just force-threaded it over the exposed end of the adjustment screw, guides the cable nicely.
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