924Board.org

buggedme · Joined: 15 Apr 2006 Posts: 4 Location: south carolina

purchased a 1980 porsche 924 turbo. Can't get it to run right, its hard to start and when it does start it runs at a high rpm and theres no throttle reponse. i'm new at working on porsche's so i need a little help

Paul · Posted: Sat Apr 15, 2006 10:58 pm Post subject:

Welcome to the board, congrats on the 931!

To best help you please add at least the country you are from to your profile.

Let's start with the most common problem, air leaks. Carefully check all the hoses and connections in the intake system (from the air cleaner to the cylinder head).
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

buggedme · Joined: 15 Apr 2006 Posts: 4 Location: south carolina

I have checked all the conections and have replaced some cracked hoses, when i get it to run it sounds like there is an exuast leak, but i didn't think it would cause it to have no throttle an run at a high rpm.
oh and my car is 924 turbo not a 931, im guessing it has the same engine?

Paul · Posted: Sun Apr 16, 2006 7:53 am Post subject:

The 924 Turbo was model number 931 just like the 911 Turbo was model number 930 and the Boxster is model 986, etc.....

Have you tried to adjust the idle speed and the ignition timing?

Are you sure there's no leaks in the metal duct that runs from the turbo to the throttle body? No leaks in the rubber hose that attaches from bottom of the fuel dizzy to the top of the turbo's compressor?
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

buggedme · Joined: 15 Apr 2006 Posts: 4 Location: south carolina

Checked hoses and found the one between the fuel dist to compressor hose clamp was loose. fixed that its easier to start but still runs at high rpm, when you open the throttle it chokes down a little. Is theree an o ring were the ducting is joined to the turbo? Also the tach is not working don't know if this would afect it or not? When i got it it had been sitting for a while and all the fuse holders where oxidized, i don't know if the connections on the instraments also need cleaning.

Paul · Posted: Mon Apr 17, 2006 8:14 am Post subject:

Yes it should have an orange o ring.
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

buggedme · Joined: 15 Apr 2006 Posts: 4 Location: south carolina

yes it has an o ring, have played with the timing, the idle ajustment is all the way out asumming you mean the adjustment on the throttle body where the throttle cable connects.
anyone got an intake to convert to a 350 holley

Paul · Posted: Mon Apr 17, 2006 9:09 am Post subject:

Ok, let's try to find some more intake leaks by using a spray bottle full of water.

Spray the water and listen for the RPMs to change.

I assume your throttle cable is adjusted properly and is not holding the throttle open.

BTW the idle bypass screw should be turned in to decrease the idle.

The next thing to check will be the brake booster and the anti backfire valve for leaks.
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.