Cutting out

[peanut]

ORIGINAL: A9XXC

measure the fuel with the Wife's best measuring jug and multiply by 4x and you have the flow rate of your pump in lts per minute .

You're a braver man than me!

Mike

if er indoors knew what had been put into her measuring jug over the years i'd be a dead man walking.[]

 

[GC8]

Im going to venture a guess (without reading the whole thread): fuel pressure regulator. If it fails the pressure goes up from 2.5/3 atmospheres up to 8+, flooding the cylinders. A new one costs about £35 and is a relatively cheap part to change as part of the diagnostic process.

Simon

 

[aporschefan]

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.

 

[Amethi]

Thanks aporschefan. I'm in East London.

I've not checked the hoses yet. Thanks for the pointer.

 

[PSH]

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

 

[JSHammond]

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

 

[Amethi]

Thanks guys, I'll have a look.

 

[ChasR]

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?

 

[tref]

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.

 

[Paul 290T]

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.

 

[George Elliott]

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

 

[pauljmcnulty]

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 [].

Not so common now, as most have been replaced, but worth a look.

 

[Amethi]

Turns out was the fuel pump regulator as you suggested Paul. Running right as rain now Thanks for the pointers all.