924Board.org

thane · Joined: 19 Aug 2003 Posts: 13

Hey again guys,

I got a weird prob. I have a '82 924 as seen in the signature below. Every now and again my engine just completely stops and cuts out..... now its happened quite a few times over the past few weeks and happens in numerous situations.

It's cut out going down a slight inlcine after a roundabout at approx 30 - 40 KPH, its cut out at around 15KPH after taking off slowly at traffic lights(maybe i dont drive it fast enuf like a porsche should

) its even happened while overtaking a truck at 110KPH (NOT FUN), although on this occasion she came back to life within seconds becasue of the momentum . The next time it cut out at 100 KPH and neva came back i just rolled to a stop (into the emergency stopping lane luckily). there has been other numerous times asewell. BUT Each time shes stopped shes started straight away as normal.

Now to me it sounds electrical, I've had nothing added, done or modified to the car, it just started happening. Its happened when the cars cold, when shes warm, at normal running temp etc. Doesnt seem to matter. Mechanic thought it could be the relay as it showed heat wear, so that was replaced but i had the same prob again this moring and got stuck in the middle of traffic lights on a hill LOL. Now we think it may be one of the fuel pumps are faulty up and perhaps forcing heat onto the relay. So were goin to try and stick a meter on it so i can keep an eye on the voltage and make sure there isn't too much current goin through. So thats our next plan of action ... Does anyone have any ideas/opinions as to what could be casuing this or had any similar problems or know of any similiar probs etc. Because this has us stumped at the moment.

Cheers guys
thane
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1982 Porsche 924 125hp

Mikri184 · Joined: 12 Sep 2003 Posts: 746 Location: Ferndale, WA

Defiantely sounds like a fuel pump, more than likely the intank pump. It is my experience relays either work or they don't but your car beig 21 years old, wouldn't hurt to replace the relay they aren't designed to last for ever. Hope this helps, Good Luck
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Life is to short to be looking for something?

Richard · Joined: 04 Nov 2002 Posts: 617 Location: Pacific N.W.

At this point it really could be anything. A lose or frayed wire at the coil will kill an engine instantly. There are also problems with the ignition switch. For a while I had to turn mine "just right" for the car to start. Start with the simple stuff and work your way up. Maybe the ignition module has a bad ground? There are two rings of quick connect ground terminals up above (and towards the firewall) the fuse and relay boxes. It is mandatory that you get on your head with a flashlight and WD-40 or similar and find these two rings and clean them. Pull each wire off and on several times. Get a small brass brush etc. Mine were totaly covered in white crust.

OR_Sunset · Joined: 04 Jan 2003 Posts: 312 Location: Veneta, OR

Had a similar problem driving my '82 yesterday. I took her for a test drive after finishing most of my work. Ran great, except I came up too fast on some stops and had to slam the clutch and the brake real fast. This proceded to kill the engine. Started right back up again, however.

What RPM range does it cut out? The higher it is, the more likely I would suspect an ignition problem.

Lizard · Posted: Tue Oct 21, 2003 3:45 am Post subject:

ok I will atack this one, first off when it dies can you still hear the fuel pump running, also have you cleaned/replaced the ground points up and behind the fuse box. also clean the ground on the ign module infront of the drivers wheel well, also the clean the connections on the coil itself. also when the engine dies does the tach just drop or does they tach slowly fall
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3 928s,

kabok · Joined: 25 Jan 2003 Posts: 179 Location: Ft. Collins, CO

I am not sure if your 82 has the two resistors on either side of the ignition coil. If you do, then check the ground wires coming off of these. Mine was loose and it exhibited the same problems you described.

AznDrgn · Posted: Tue Oct 21, 2003 5:24 am Post subject:

long shot but check the two tach wires coming out of the distributor, mine were broken when I got to them but prior to that the car acted funny and did what you were describing. If not the tach wires the answers to lizards questions would help out a lot.
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-'87 Jeep Cherokee 4.0L 6" of lift 33" Super Swampers

-'83 Callaway 944 2.5L turbo, 300HP, 1 of 42 ever made

wdb · Joined: 02 Nov 2002 Posts: 2024

bryanc · Joined: 27 Feb 2003 Posts: 233 Location: San Antonio, Texas

My 924 na did the same thing and it turned out to be the hall effect sensor in the distributor. If it dies and won't start, check for spark. No spark then it's electric. Just pull a spark plug wire off the plug and put a screw in the end of it. Place the wire with the screw in it where you can see it between the hood and your dashboard and leave a small gap between the screw and valve cover. Crank the engine and you should see a spark jump from the screw to the valve cover.
I'm still looking for the choke, float and accel pump on mine.
Sorry wdb, I just had to.
I hope this helps.
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'84 944
I'd rather have a bottle in front a' me than a frontal lobotomy
Tom Waits

wdb · Joined: 02 Nov 2002 Posts: 2024

its ok bryanc , i dont mind people pokin fun at my mistakes . but or_sunset has removed his cis and installed carbs , so he has those . and i adressed that post to him .

bryanc · Joined: 27 Feb 2003 Posts: 233 Location: San Antonio, Texas

wdb, I just read the post and in the third paragraph of the original post it said "Now to me it sounds electrical, I've had nothing added, done or modified to the car, it just started happening. To me that meant what it said. As far as you posting the message to him, does that mean that nobody can comment?
This probably sounds more offensive than it is meant, no offense intended.
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'84 944
I'd rather have a bottle in front a' me than a frontal lobotomy
Tom Waits

Which car to buy? · Joined: 24 Mar 2003 Posts: 163

bryanc, I think he was talking to Or_sunset. Not the top/first post in this thread from thane.

bryanc · Joined: 27 Feb 2003 Posts: 233 Location: San Antonio, Texas

OOPS
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'84 944
I'd rather have a bottle in front a' me than a frontal lobotomy
Tom Waits

wdb · Joined: 02 Nov 2002 Posts: 2024

I was responding to what or_sunset wrote only , I was not talking about the original post . I thought I was clear on that by quoting or_sunset .

no offense taken .

gwsg · Posted: Tue Oct 21, 2003 9:40 am Post subject:

Check the wires going to the fuel pump relay plate for corrosion/verdigris. On RHD models the battery is right above the fuse box and acid can leak down onto the wires and fuse box. I have had this same cut out problem and jiggling the relay would get me contact again and off I would go. It got to the point where the relay was getting so hot I was afraid of starting a fire so I have recently replaced the fuse box, wiring and relay plates after fixing the leak in the battery box of course. Good luck, it's no fun when the engine dies in heavy traffic.

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My 80 924 loves me.