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How to connect & operate the Hoffman CIS Test Kit
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dpw928  



Joined: 03 Nov 2002
Posts: 1861
Location: owasso, ok 74055

PostPosted: Fri Oct 07, 2011 3:09 am    Post subject: Reply with quote

The 30 circuit is direct to the battery and the 87 is direct to the fuel pump, so connecting them will start the pump. The WUR heater works off the 15 (ignition on) circuit, so jumping the 30 and 87 will not heat the WUR. The control pressure can be tested without heating the WUR. If the engine is cold, just use the ambient temp to compare your test results. You test the heater by taking an ohm reading between the two connects and testing each connect for a fault to ground.

The haynes manual was probably referring to the pump running for a few seconds when the key is turned to on and the relay installed. This primes the fuel system.

Dennis
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TheBib  



Joined: 21 Aug 2011
Posts: 50
Location: Michigan

PostPosted: Fri Oct 07, 2011 4:42 am    Post subject: Reply with quote

Understand about testing the heater, but there in lies an assumption that if the hearter works the warm control pressure will be on spec.

SO my question is if i do in fact wish to test the warm control pressure how do i accomplish this.

also Idola you mention about pulling the injectors. I know all of mine are fine, do i really need to pull them. Since the fuel pressure tests are performed with the engine off, the air sensor plate and arm should be down and therefore no fuel being injected into the intake. And i know none of mine leak when the sensor plate is at rest.
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dpw928  



Joined: 03 Nov 2002
Posts: 1861
Location: owasso, ok 74055

PostPosted: Fri Oct 07, 2011 5:16 am    Post subject: Reply with quote

Yes, if the cold control pressure is correct and the heating element is working correctly, the warm control pressure should be within spec also. If you want to test it warm, run the engine, measure the temp of the body of the WUR and compare the control pressure to the chart at that temp.

You would only want to pull the injectors if the system failed the leakdown test.

Dennis
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TheBib  



Joined: 21 Aug 2011
Posts: 50
Location: Michigan

PostPosted: Fri Oct 07, 2011 5:24 am    Post subject: Reply with quote

Another question Ideola, when you mention connection of the lines, I understand the press guage test line without the valve goes to the fuel distributor.

However is the pressure guage test line with the valve connected to the very line that you removed from the fuel distributor? (in other words all i am doing is putting the test appratus inbetween the fuel distributor and the line i removed from the fuel distributor. Or do you mean i need to trace back the WUR line back and single out that single line alone. Reason i ask is if i trace the line from the WUR on its merry way to the fuel distributor, it tees off multiple times.
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TheBib  



Joined: 21 Aug 2011
Posts: 50
Location: Michigan

PostPosted: Fri Oct 07, 2011 9:40 am    Post subject: Reply with quote

Where do I connect the test pressure gauge lines?

fuel distributer



Where WUV line connects to fuel distributer



This is a multiple connection Tee branch that the WUV line connects through on its way to the WUV


Line connected to the WUV

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TheBib  



Joined: 21 Aug 2011
Posts: 50
Location: Michigan

PostPosted: Sat Oct 08, 2011 12:05 am    Post subject: Question for Ideola Reply with quote

Dan -- in my previous post hopefully the pictures show up. If not let me know and I'll try to re-post. By the way, where I mention WUV I actually meant to say WUR. I'm going to try to work on it tomorrow.
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rhialto  



Joined: 09 Jul 2004
Posts: 23
Location: Netherlands

PostPosted: Sun Feb 09, 2014 3:16 am    Post subject: Reply with quote

Double post

Last edited by rhialto on Fri Mar 14, 2014 12:58 am; edited 1 time in total
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rhialto  



Joined: 09 Jul 2004
Posts: 23
Location: Netherlands

PostPosted: Fri Mar 14, 2014 12:57 am    Post subject: Reply with quote

I'm setting my WUR at the moment, but I see there's no mention of the control pressure during boost (M31.01 Euro).
Does anyone have the boost control pressure value?
This way I can set the boost control pressure by moving the disk at the bottom of the wur.
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rhialto  



Joined: 09 Jul 2004
Posts: 23
Location: Netherlands

PostPosted: Tue Mar 18, 2014 5:56 am    Post subject: Reply with quote

I found the answer in the "Porsche 924 Turbo Model 79 Service Information.pdf" :
With boost pressure above 0.3 bar at the boost nipple: 2.9 bar +-0.2 bar

In the 82 Service information is the following:
Europe, Rest-of-world, Sweden, Australia: 2.9 bar +-0.2 bar
USA, Canada, Japan: 2.8 bar +-0.1 bar

Maybe Ideola can add this to the list?
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Tanso  



Joined: 17 Mar 2014
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PostPosted: Sat Dec 05, 2015 3:02 am    Post subject: Reply with quote

So the engine does not need to be started for cold tests?
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ideola  



Joined: 01 Oct 2004
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Location: Woodstock IL

PostPosted: Sat Dec 05, 2015 3:38 am    Post subject: Reply with quote

Tanso wrote:
So the engine does not need to be started for cold tests?

No.
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Rasta Monsta  



Joined: 12 Jul 2006
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PostPosted: Sat Dec 05, 2015 4:58 pm    Post subject: Reply with quote

Urg, upon starting 12v would go to WUR defeating purpose of cold test.
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gerben1986  



Joined: 13 Mar 2008
Posts: 213
Location: The Netherlands

PostPosted: Thu Nov 03, 2016 2:16 am    Post subject: Reply with quote

TheBib wrote:
Where do I connect the test pressure gauge lines?

fuel distributer



Where WUV line connects to fuel distributer



This is a multiple connection Tee branch that the WUV line connects through on its way to the WUV


Line connected to the WUV

5 years later I had exactly the same question. And I found the solution: you need to connect the meter directly to the fuel distributor. So it will be positioned between the fuel distributor and the valve.
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Dutch924-racer  



Joined: 23 Jul 2007
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PostPosted: Wed Jun 14, 2017 7:20 pm    Post subject: Reply with quote

Can you do the warm test without the engine running ?
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ideola  



Joined: 01 Oct 2004
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Location: Woodstock IL

PostPosted: Wed Jun 14, 2017 8:01 pm    Post subject: Reply with quote

Dutch924-racer wrote:
Can you do the warm test without the engine running ?


Yes, as long as the electrics are working correctly.
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