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Search took 0.01 seconds. Search: Posts Made By: jeroensprint

Forum: Porsche 911 Technical Forum

01-01-2026, 05:37 PM

Replies: 10

930 turbo Cis mistery

Views: 327

Posted By jeroensprint

Hello Tony, Thank you for your effort and...

Hello Tony,

Thank you for your effort and time.

Your conclusion is not what is happening here. I'm not explaining well or you are reading my text wrong.

I don't have a WUR fitted, so...

Forum: Porsche 911 Technical Forum

01-01-2026, 01:26 PM

Replies: 10

930 turbo Cis mistery

Views: 327

Posted By jeroensprint

Hello Tony, here some pics with the different...

Hello Tony, here some pics with the different measuring situations and pressures.

The WUR pics are not mine, just random. I had three WUR upper housings fitted, all without the little filter and...

Forum: Porsche 911 Technical Forum

12-31-2025, 07:28 AM

Replies: 15

911 with CIS won't start

Views: 378

Posted By jeroensprint

I'm with Harry, try some starter fluid first. ...

I'm with Harry, try some starter fluid first.

I have fitted over 200 123 ignitions and I think around 15 were on 911's. Using a std Bosch coil the ignition is totally conventional this way and...

Forum: Porsche 911 Technical Forum

12-31-2025, 07:15 AM

Replies: 10

930 turbo Cis mistery

Views: 327

Posted By jeroensprint

System pressure is 6,7 bar. You could think...

System pressure is 6,7 bar.

You could think the new pump has too much flow but the same symtoms were with the old pump. That was 5 bar max and a std Bosch pump for any CIS Porsche.

The control...

Forum: Porsche 911 Technical Forum

12-31-2025, 07:05 AM

Replies: 10

930 turbo Cis mistery

Views: 327

Posted By jeroensprint

Hello Tony, thank you for your reply. I'm...

Hello Tony, thank you for your reply.

I'm located in The Netherlands. I will give you some info.

The fuel distributor is 0438100037, the WUR is 0438140054, the type with the extra membrane.
...

Forum: Porsche 911 Technical Forum

12-30-2025, 03:33 AM

Replies: 10

930 turbo Cis mistery

Views: 327

Posted By jeroensprint

Hello, that was one of my first checks, When I...

Hello, that was one of my first checks, When I connect the two WUR lines to eachother, the one from the fuel distributor and the WUR return, the controlpressure is zero. That does eliminate blocked...

Forum: Porsche 911 Technical Forum

12-29-2025, 10:49 AM

Replies: 10

930 turbo Cis mistery

Views: 327

Posted By jeroensprint

930 turbo Cis mistery

Hello,

My first post here. I’m Jeroen and trying to get a friends Porsche 930 Turbo running. The car hadn’t run for over 20 years and history unknown.

This forum pops up regularly in the...

Forum: Porsche 911 Technical Forum

12-15-2025, 03:05 PM

Replies: 26

Cold no start 1981 911SC -090 WUR

Views: 623

Posted By jeroensprint

Did you change the plugs already? It's a simple...

Did you change the plugs already? It's a simple start. Every faulty plug does spark in free air but doesn't in the cylinder. The voltage is led directly by the isolator to the ground. A tester or a...

Forum: Porsche 911 Technical Forum

12-15-2025, 02:40 PM

Replies: 0

Porsche 1978 930 Turbo K-Jetronic mystery

Views: 116

Posted By jeroensprint

Porsche 1978 930 Turbo K-Jetronic mystery

Hello,

My first post here. I’m Jeroen and trying to get a friends Porsche 930 Turbo running. The car hadn’t run for over 20 years and history unknown.

This forum pops up regularly in the...

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