944 cutting out

ryan 944 · **Posted:** Mon May 26, 2008 5:43 pm

hi all any ideas me car can be driving fine and them will just stop, if i let it sit for a stort time it will go again, it is if it has run out of petrol, i have changed the fuel pump but this has not sloved it has anyone got any ideas thanks,
the car is a 1984 2.5 944

:roll:

tr7v8 · **Posted:** Mon May 26, 2008 6:17 pm

You need to get organised. Carry a spare spark plug, next tie it stops dive out, pull an HT lead off & find if you have a spark by plugging the loose plug into the lead. If you have no spark, put a bulb or meter across the coil does it flash?
Is the fuel pump still running when it stops, connect a pair of wires across the fuel pump & bring them into a side light bulb or similar inside the car. Is it still lit when the car stops, fuel pump relays can go flakey on these early systems.
This should give you something to go on. DON'T haphazardly replace bits that can cause massive grief.

EL Gordo · **Posted:** Mon May 26, 2008 6:32 pm

try a new dme, it is after all a 944 !!!!!!!!!!

tr7v8 · **Posted:** Mon May 26, 2008 7:08 pm

dekandgord wrote:

try a new dme, it is after all a 944 !!!!!!!!!!

It's an early car they don't have a DME relay as the later cars. They have just a fuel pump relay.

ryan 944 · **Posted:** Wed May 28, 2008 7:52 am

hi all

right last time it stoped , run out with my spark plug lol :lol:

,tested that i had a spark yes we do so we know that works,
keep thinking guys :roll:

(might be bad wiring dry joint or somethink???) i will keep looking

Li Moo Bai · **Posted:** Wed May 28, 2008 12:18 pm

Try testing the fuel pump relay. A 12V battery, bulb, and some test leads are all you will need.

Adam

tr7v8 · **Posted:** Wed May 28, 2008 12:56 pm

Li Moo Bai wrote:

Try testing the fuel pump relay. A 12V battery, bulb, and some test leads are all you will need.

Adam

As he said, also check the fuse box around the fuel pump relay is not full of corrosion.

Li Moo Bai · **Posted:** Wed May 28, 2008 1:17 pm

tr7v8 wrote:

Li Moo Bai wrote:

Try testing the fuel pump relay. A 12V battery, bulb, and some test leads are all you will need.

Adam

As he said, also check the fuse box around the fuel pump relay is not full of corrosion.

Aye. Would be worth checking that supply is getting to the pump (as you said further up).

Is it cutting out when idle or with throttle open?

Adam

JW590 · **Posted:** Thu May 29, 2008 2:42 am

The time of the posting may look a bit strange, but I am sat in Toronto and it's five hours behind UK time. Hardly any Porsches here, only seen 1 x 964C2, 2 x 928, 1 x Cayman, 1 x Cayenne.

Mine did this cutting out thing too. It was a dirty plug on the side of the MAF. I found the problem by accident. Then I took the plug off, cleaned it, put it back on securely - never had a problem since.

Good luck with it.

ryan 944 · **Posted:** Thu May 29, 2008 7:28 am

ok somethings to be getting on with then

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