Porsche 944 Cabriolet problem

944bob · **Posted:** Tue Sep 24, 2019 10:58 pm

Hi guys,

I had a run out to the coast last week in my 944 Cab with my son in his 1992 944 Cab.
My son's car started to miss-fire badly approaching the coast, belching out black smoke and smelling of petrol.
We pulled over to the roadside and his car would not tick over, he had to depress the accelerator to keep the car running.
We managed to get the car back home but he had used a huge amount of fuel to do just that.

We feel that it might be the fuel pressure regulator at fault but I would appreciate your expert help on this one?

Cheers,

944bob

Waylander · **Posted:** Wed Sep 25, 2019 6:42 am

If you pull off the vac hose to the FPR and it’s full of fuel then you could well be right, but the only real way of testing them is with a fuel pressure gauge

Prophead · **Posted:** Wed Sep 25, 2019 5:00 pm

As Waylander said you need to check it with a pressure test. Check the fuel dampener as well - if that model has one.

If it is the FPR search very widely for one. I had to replace one on the 944s 2 yrs ago, my OPC could provide one at ~£280, I ended up buying one from USA for £99 inc shipping and tax exact same Bosch FPR made in Germany and shipped twice round the world for 1/3 of the price - madness!

Wh1t3Kn1ght · **Posted:** Thu Sep 26, 2019 7:25 pm

The FPR for the Turbo with the threaded connection is rare as rocking horse poo, only place I could find is a seller in eastern europe with none-Bosch part.

Luckily mine tested out fine :alien:

Prophead · **Posted:** Thu Sep 26, 2019 7:45 pm

Wh1t3Kn1ght wrote:

The FPR for the Turbo with the threaded connection is rare as rocking horse poo, only place I could find is a seller in eastern europe with none-Bosch part.

Luckily mine tested out fine :alien:

Pretty sure Lindsey racing do their own one for the turbo.

Wh1t3Kn1ght · **Posted:** Fri Sep 27, 2019 8:13 am

Prophead wrote:

Pretty sure Lindsey racing do their own one for the turbo.

Not a straight swap for the threaded FPR though, they do an adjustable FPR with a threaded connection and the rest are the clamp type connection so you have to change your fuel hoses to match.

scam75 · **Posted:** Fri Sep 27, 2019 9:18 am

I've still got my standard turbo threaded one, plus 2 3 bar ones, one on car obviously, all work fine. Maybe should get them insured!!

Wh1t3Kn1ght · **Posted:** Fri Sep 27, 2019 2:11 pm

scam75 wrote:

I've still got my standard turbo threaded one, plus 2 3 bar ones, one on car obviously, all work fine. Maybe should get them insured!!

Not a bad idea - I did lookup the fuel hoses for the clamp type FPR -

Return Line - 951 356 917 03 - £167.06 inc VAT

FPR - 944 110 198 03 - £317.52 inc VAT

As you know the threaded FPR (944 110 198 05) is no longer available...

944bob · **Posted:** Fri Sep 27, 2019 11:16 pm

Thanks for your help guys, but this is the NON turbo 3 litre straight 4.

Could it be something else causing the symptoms???

Wh1t3Kn1ght · **Posted:** Sat Sep 28, 2019 4:00 pm

944bob wrote:

Thanks for your help guys, but this is the NON turbo 3 litre straight 4.

Could it be something else causing the symptoms???

Sorry we de-railed your thread slightly but all cars do use an FPR so it could still be your issue.

The part number is different is all...

944bob · **Posted:** Mon Sep 30, 2019 11:06 pm

Not a problem,
Can someone point me in the right direction to the Porsche part number for the fuel pressure regulator please?
I am getting a variety of different part numbers the more I search the internet!!!
I do realise it could be something else, but this would maybe be a good place to start!
1992 Porsche 944 S2 Cabriolet; non-turbo; 3 litre straight 4.
Cheers guys,
Bob

j.c · **Posted:** Sat Oct 12, 2019 12:03 am

Throttle positioning sensor, in particular check that the WOT switch is functioning correctly

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Porsche 944 Cabriolet problem

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