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Cutting out

A

aporschefan

PCGB Member
Where are you based? A few years ago, I had a similar issue (but not exactly the same) and on my car it was a vacuum leak. Have you check all hoses are properly secured? Am sure lots of people will be along soon to give advice. Good luck and hope you get it sorted.
 
Hi Amethi Have you checked the two multi plugs that are at the back of the engine just below the Cam tower. These tend to get corroded or even come apart due to age. Even if they look ok it's worth unplugging them and giving the contacts a good rub with some emery paper. The position i have given for these multi plugs is for the Turbo model so may not be in exactly the same place for your car. Pete
 
Hi all,

I'm relatively new here and new to the 944. I've been lurking and soaking up as much information as possible partly due to the excitement of recently getting the car and also because I half expected an issue at some point. The car was bought off of an enthusiast (aren't they all?) who seems to have kept the car in good condition. We dropped it off at RGA Porsche in Vauxhall for a full service and ended up spending a couple of grand to get a number of issues looked at on top of the service. Bob there was shocked at some apparent hammer marks on the cam belt tensioners and a cam belt cover that fell to bits when removed... Anyhow... Besides that he said it was in good condition.

The other day the car let my wife down and stranded her out in the sticks (£200 recovery charge, thanks!). The engine keeps cutting out. The engine just dies. The rest of the electrics are fine. Two RAC men couldn't identify the issue but felt confident it was an ignition amplifier issue. As far as I can deduce, my 1986 2.5L 8v doesn't have one, that function is managed by the DME.

Doing some research it seems the first place to start was to replace the DME Relay. I've done that tonight and it's still cutting out. It did it when I was revving as well, so I don't think it's an idle issue, it's just like someone killed the power (though everything else stays on just fine). I've also checked the earth mount on the bulkhead. That seems secure. Spark plugs and distributor cap have been replaced as part of the service too.

Other threads on here that seem to be related are a bit daunting as they go into a ton of things to check, but I wanted to see if anyone had any simple ideas off the top of their head as to what the issue might be, or what to check?

I'm waiting on some quotes to get the car taken back to RGA but would rather not go to that expense if I could identify the issue as something straight forward I could remedy.

Thanks!
 
I had a similar problem a few months ago, I got lots of feedback on this thread: http://www.porscheclubgbforum.com/tm.asp?m=813231&mpage=1&key=&#813231 The fault turned out to be a KLR unit that had water damage and worked intermittently. Josh
 
On a car of mine this turned out to be a problem with a new but pattern rotor arm of the Intermotor brand. Bypassing the resistor with some wire (it had a contact breaker setup before anyone asks) soon had me back onto the road. When it starts to stop have you checked for fuel and a spark?
 
This sounds similar to a problem I heard about the last stage of the ignition amplifier thingy dying within the brain... I seem to recall the check was to disconnect one injector and see if it will run then. To me it sounds like something electrical overheating and cutting out (as above) or fuel starvation... I.e. The pump can build up a reserve to get it to start, but then cannot provide enough to keep it running. Anyway, the injector trick for the ignition amplifier thingy is a simple enough check to carry out so probably worth trying.
 
Same symptoms as my 86 turbo. For me it was the Motronic ECU. Diagnosed during a time when the engine would not start. Tapped the Motronic case with a screwdriver whilst a friend turned over the engine, the tap caused the engine to spring into life. Sent Motronic unit it for refurb to ATP Electronics, £344, sorted now. Your best best chance of tracking down the cause is testing whilst it won't start. the working your way around the suggestions in this post. Best of luck. Don't despair you will find it and fix it eventually.
 
there is an electrical test for the AFM on the web. it requires a 9v battery and multimeter which shows a progressive resistance reading without interruption caused by a worn spot. cheap test to do and a high probability source of fault Good luck with it George 944t
 
I'm not the tech expert by any means, but a 944 that runs fine, but then dies with no other signs, often used to be the fuel pressure regulator. I've stood taking to an owner while the car ran fine, then just turned itself off. As it did on the motorway [:eek:]. Not so common now, as most have been replaced, but worth a look.
 
Turns out was the fuel pump regulator as you suggested Paul. Running right as rain now :) Thanks for the pointers all.
 
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