Porsche 911 while driving suddenly high idle ~3000rpm

[waazzupdude]

Hello everyone,
I had just recently purchased a 1981 Porsche 911 SC Targa that has been non-operational for three years and had not been driven by the previous owner. It started up great and I noticed the oil needed changing so I turned it on to heat it up but also noticed that the car had no gas so I drove it a mile to the nearest gas station to get it filled.

In that drive, it was running great but suddenly the rpm became stuck at 3000 rpm. When I accelerate it would accelerate above 3000 rpm with no hicups but when I let go of the accelerator it goes back and stays at 3000 rpm.

I put gas in it and restarted the car and it still had the same problem. Keep in mind that when I had been turning on the engine in the garage for short periods of time it did not have this problem.

When I got home I removed the oil and I am waiting on parts to fix some leaks so I have not turned it on since.

I am thinking that since this car had not been driven in a long time, something got stuck. Is it possibly the auxiliary air valve (AAV) or auxiliary air regulator (AAR) is stuck? Could someone also help me figure this out?, which one is the one that is on the right side of the engine under the airbox. Or could it be a clogged fuel filter or fuel injector? The fuel filter seems new though.

I went ahead and tried to remove the what I think is the AAV to run some tests but I got stuck because after I removed the two hoses and the electrical connection it still seems to be held on.

If someone can direct me to a course of action or how to remove the AAV I would much appreciate. I am new to porsches so I need some help! Thanks

[MrBonus]

Check the cruise control cable and make sure it didn't break, crack, or split. Had a similar problem on the highway from this.

[tirwin]

There are two Allen head bolts that have to be removed. 6mm I think. You'll probably need an Allen head socket on a swivel with an extension to remove it. That is the AAR though. The AAV looks like a flying saucer and is also under the air box on the right side. The AAV looks similar to the decel valve. The decel valve is further back and has a vacuum line that goes to the middle of it (if it hasn't been disconnected and plugged which is fairly common).

Maybe you're thinking the AAV is not closing. There is a test procedure for it posted in the CIS Troubleshooting for Dummies thread. You use a hand vacuum pump to test it.

[waazzupdude]

Okay Mr. Bonus I will take a look. Thank you for the input and I'll ask you again if I need more help! Also I do not think I activated cruise control and the cable seemed okay. What kind of thing should I look for

[waazzupdude]

Hello tirwin

Yeah I might have gotten the names of those two things confused. Which one is more likely the culprit for my kind of problem is it the AAV (the saucer looking thing)?

[tirwin]

yes, the AAV.