924Board.org

John · Joined: 28 Jun 2003 Posts: 23

Dear All,

I have recently become a 924 owner (1982 UK 924), having just bought the car from by brother. It is an immaculate example that has not been used (but has been started serveral times) over the last 4 years. The only problem is that when I try to start the car it always takes 5 attempts from cold. On each attempt it tries to start but won't keep going. On the 5th attempt it starts but cuts out if the accelorator is touched. However, if you don't touch the throttle it runs smoothly and once warm accepts throttle responce without any problem. There are no problems if you turn the car off when warm and restart.

Any help would be seriously appreciated.[/i]
_________________
Many Thanks

Ross

1983 UK Porsche 924

CMXXXI · Joined: 05 Nov 2002 Posts: 1939 Location: Vicksburg, MS

Sounds like the Warm-up regulator (aka control pressure regulator) is dead.
_________________
'79 Eurospec 931

Minus000 · Joined: 29 May 2003 Posts: 363 Location: Sidney, B.C.

I also need a new WUR. My mixture is set far to rich when it is first started. Try searching for old posts about warm up regulators, I think his alias is martiniross(924?) something close to that. He had a few tested and working regulators. I need to email him and see if he still has anymyself.

Chrenan · Joined: 15 Jan 2003 Posts: 3903 Location: Canada

John,

I also had Warm Up Regulator (WUR) issues with my car when I first got it. There is not much you can do except take the old one off and bolt on a new one (it's found on the back of the engine block, looks like the cabin of a tug boat). You might want to just check that the electrical connections going into the WUR are snug. After fooling around in my engine I once forgot to reconnect these electrical connections and my starting problems returned (I though my new WUR was dead and I was angry until I realized my stupid mistake). In any case, check the connections first then find a Porsche part supplier near you in the UK. I paid $185 Canadian for my new WUR, but I think I may have got royally screwed as it was one of my first part purchases...

Chrenan
_________________
1987 951 - M193 Version for Japan

Roger · Joined: 06 Jan 2003 Posts: 1235 Location: Cordova, TN

The cold start system is made up of several parts. The WUR may be going out. A CIS pressure test will confirm this. You will also want to check the cold start valve, auxilliary air regulator, and the thermo time switch. All of these parts could be causing the sypmtoms you describe, and the are easy to check and much cheaper than the WUR. Also a leaking fuel injector could be the problem. If you have a Haynes manual all of the procedures are in it. You can aslo check the tech section and the FAQ on this board. If not I can post the procedures. Post back and let us know what you need. There are alot of knowledgeable people here and I have learned alot from this board.
_________________
1981 924 NA

Some people are like Slinkies. Not really good for anything, but you
still can't help but smile when you see one tumble down the stairs.

CMXXXI · Joined: 05 Nov 2002 Posts: 1939 Location: Vicksburg, MS

My first attempt at posting a photo was a bust... gotta talk to my buddy about this...

(hmm, image doesn't seem to work, so click below. N/A WUR in foreground on left, turbo WUR on right and in background)
http://209.205.173.209/~camaro/gallery/album04/WUR2 The turbo WUR has a chamber on the bottom used to regulate pressures during boost.

Check out this post for some info on the WUR:
http://www.924board.org/viewtopic.php?t=6583

Roger; If he's getting a short duration start/stumble then I suspect the engine is starting off fuel from the cold-start injector. Like you say, a CIS pressure test will narrow things down quickly.
_________________
'79 Eurospec 931

ltgland · Posted: Sat Jun 28, 2003 9:10 pm Post subject:

I had problems with my 1985 UK 924, turns out the ignition was the problem.

get a new dizzy cap and rotor from Halford (£10), and check out your plug leads.

do they have a metal shield on the plug end? if not they are not the OEM ones. The plastic ended ones tend to die from the heat of the engine and exhaust (which runs next to the plugs).

1982Porsche924 · Joined: 14 Nov 2002 Posts: 679 Location: Cupertino, CA

My bet is either the WUR or the fuel pump. Usually on colder days, I have to put my key in the igntion, wait a couple seconds till I hear the fuel pump prime, then the car will start after a few cranks.
_________________
1979 Porsche 924 "S"
Engine: Euro pistons, Light Flywheel, Weber TB, Bursch Header, Cam Wheel
Suspension: Front coil-overs, adj sways, Solid bush. Thicker tors. bars, 5-bolt, BBS rims
Body: Fiberglass widebody kit, 931 Nose

John · Joined: 28 Jun 2003 Posts: 23

To CMXXXI, Cheers that picture is really useful because my Haynes doesn't show me a picture. I've tested the cold start valve and it works and is controled as it should so il next try the aux. air regulator and WUR. Cheers 4 all your help.
_________________
Many Thanks

Ross

1983 UK Porsche 924

CMXXXI · Joined: 05 Nov 2002 Posts: 1939 Location: Vicksburg, MS

Yes, the WUR is sure hidden, isn't it. When installed, you can't really tell what it looks like. To remove, you'll need a hex type socket (aka Allen wrench style) but I can't remember what size exactly (6mm ?) and some patience. It's attached with two of these bolts, and it's really tight quarters to get at. I highly recommend getting the pressure checked before pulling the thing, as it may save you the time and frustration.
_________________
'79 Eurospec 931

Lizard · Posted: Tue Jul 01, 2003 2:01 am Post subject:

1982Porsche924 · Joined: 14 Nov 2002 Posts: 679 Location: Cupertino, CA

That sounds easier than what i did, I pulled the manifold to check it. Then again, I wanted access to the breather hose.
_________________
1979 Porsche 924 "S"
Engine: Euro pistons, Light Flywheel, Weber TB, Bursch Header, Cam Wheel
Suspension: Front coil-overs, adj sways, Solid bush. Thicker tors. bars, 5-bolt, BBS rims
Body: Fiberglass widebody kit, 931 Nose