Mike Murphy

My '99 996.1 idles at 650 RPM. Seems low, but it idles very smoothly and I'm not having any issues with the engine speed that low.

Down South

Mine has always been a little lumpy and idles around 700, but if I engage the A/C compressor, it instantly goes to a very steady idle at about 850-900. It works for me since I live in FL and the A/C Is on most of the time anyway.

time4a911

Reviving the thread:

Anyone able to raise the idle on a '99?

I have stalled my 996 more in one weekend, than all the other manual cars I have owned.

As noted above, my Carrera needs a bit of throttle for a smooth take off.

peace,
time4a911

Bash Hat

Would like to know this too. Would make smooth take offs way easier. Is there an idle adjustment screw on the 99 with cable throttle?

Bash Hat

Took a look at my TB and see this stop screw. Looks like it can be adjusted. Would turning this screw to raise it upward cause the throttle blade to stop a little more open and raise the idle speed? Didn't want to mess until someone here chimes in.

Hurdigurdiman

Moving the stop screw definitely will increase the speed of the idle by cracking the butterfly. I thought of doing just that, but see others idling at 650rpm and by simply putting on the lowest setting with fan on AC will raise the idle to about 750rpm. That is good enough for me as I don't want to interfere with something that was SET to the Porsche Factory setting.

time4a911

I noticed that, but the you cannot screw it without some plyers, thus, possibly damaging the threads.

Mine is on there very tight. I'm thinking that an actual screw with the same thread can be a good replacement.

That will be something for me to do in the near future.

time4a911

I did all the time in my 90's Mustangs and never had a problem. I figure, mark it with something and the car does not like it, simply return it to it's original setting.

808Bill

Pliers? That screw must have an allen head to be adjustable.

extanker

car makers need to start sealing the engine compartment.........tamper proof fasteners are not quite cutting it. SNAP OUTTA OF IT

time4a911

Agreed, however mine does not.