warm up regulator power

[ssrodder]

Does anyone know where the power to the Warm up regulator originates from? I'm having a start up problem and when checking the WUR I found I have no power to it with the key on.
I also need a lead to purchase the adapters to check the fuel pressure at the WUR. I recently purchased a pressure gauge with the lines and shut off valve on ebay, but it did not come with the adapters which attach to both the warm up regulator and the fuel distributor.

[lucittm]

What car are you referring to? On my '91 turbo, the "hot running regulator" power comes from the Turbocharger Control Unit under the driver's seat (pin 9).

Mark

[Rana1]

If it's an SC,

Im not absolutely sure about that but I believe power comes once the engine is started, not just with contact.

It's dependent on engine temp as well, so if you have starting problems with the engine still hot it's probably not the cause.

[john walker's workshop]

from the fuel pump relay, which would not be activated until the sensor plate is raised.

[boyt911sc]

Originally Posted by john walker's workshop

from the fuel pump relay, which would not be activated until the sensor plate is raised.

WUR, AAR, and TV all get power directly from the FP relay @ terminal #30. To test power without running the motor, perform test similar to FP test. Here is a brief description of the test:
1). Remove FP relay (red relay).
2). Jump terminals 87a and 30. Preferably wire with a fuse.
3). Turn ignition switch to RUN/ON not start postion. FP should run at this point.

I prefer the above procedures over lifting the air sensor plate because you eliminate the chance of fuel flooding the cylinder/s during prolong and repeated testing. Just my two cents.

Tony

[kodioneill]

Originally Posted by ssrodder

Does anyone know where the power to the Warm up regulator originates from? I'm having a start up problem and when checking the WUR I found I have no power to it with the key on.
I also need a lead to purchase the adapters to check the fuel pressure at the WUR. I recently purchased a pressure gauge with the lines and shut off valve on ebay, but it did not come with the adapters which attach to both the warm up regulator and the fuel distributor.

what year and type?

[x98boardwell]

My car will not have power at the WUR unless the starter is turning over or the car is running. You will not have power to the WUR on a CIS car with just the key on. Also same for the AAR.

Bryan

[boyt911sc]

Originally Posted by x98boardwell

My car will not have power at the WUR unless the starter is turning over or the car is running. You will not have power to the WUR on a CIS car with just the key on. Also same for the AAR.
Bryan

There several ways to send power to terminal #30 of the FP relay socket, where the FP, WUR, AAR, and Thermo switch valve are all directly connected (for SC's).

1). Turn the IS (ignition SW) to START.

With the IS @ RUN or ON position:
2A). Lift the air sensor plate.
2B). Jump terminals #87a and 30.

The last two (2) tests are commonly used for diagnostic testing of FP and other related CIS components.

Tony

[ssrodder]

Thanks everyone. Much appreciated. It is a 82 911sc. One other item. I checked the OHM's across the contanct in the WUR and it is only showing 10 OHM's.
I have read it should be about 18. Still looking for a source for the adapters on the WUR and fuel distributor. Thanks again.

[john walker's workshop]

easiest way to test is to unplug the sensor plate switch. the green plastic plug around the front of the sensor plate housing. the pump will run with the key on then.

[Gunter]

Originally Posted by ssrodder

Thanks everyone. Much appreciated. It is a 82 911sc. One other item. I checked the OHM's across the contanct in the WUR and it is only showing 10 OHM's.
I have read it should be about 18. Still looking for a source for the adapters on the WUR and fuel distributor. Thanks again.

The electric Bosch plug on the WUR is also used by other vehicles like VW.
You can test the WUR by disconnecting the electric plug, then make up a temp devise by getting a plug from a wrecking yard and rigging up 12V on one side and ground on the other.
Just make sure you apply 12V to the right pin.
Porsche uses brown color for ground.
WUR should start feeling warm after about 5Min.

[Paulporsche]

Is it a starting or warming up problem?

If starting, is it possible that, since the WUR, TTS and AAR are wired together, the TTS is failing to fire the CSV and the AAR is failing to raise the sensor plate?

[john walker's workshop]

the AAR doesn't raise the sensor plate, the air that the cranking/running engine pulls in does it. the lower cold control pressure from the WUR allows more lift cold and less lift hot, acting as a cold/warmup period enrichment device.

[boyt911sc]

Originally Posted by Paulporsche

Is it a starting or warming up problem?

If starting, is it possible that, since the WUR, TTS and AAR are wired together, the TTS is failing to fire the CSV and the AAR is failing to raise the sensor plate?

Paul,

Let's not confuse the readers about CIS components' function by giving them misleading information. TTS (thermotime switch) controls the operation of a CSV (cold start valve) as you mentioned but this is wired in a completely different circuit. TTS is not wired together with the WUR and AAR. Thermovalve switch is the other CIS component connected to terminal #30 (fuel pump relay).

Lastly, AAR has nothing to do with the movement (up/down) of the air sensor plate as far I as know. Maybe this is something new to add to our collective knowledge. But I have some doubt about it. Just my two-cents.

Tony





Tony

[EngrBill]

For those with 75 911s (is that you Bryan?)

I wasted a little time checking the wiring between my WUR and FP relay.

In 75 there is a separate WUR relay that gets its power from the alternator, so the engine must be running. The factory manual says to run 12v directly to the WUR for the WUR pressure test.

Bill

[boyt911sc]

Originally Posted by EngrBill

For those with 75 911s (is that you Bryan?)

I wasted a little time checking the wiring between my WUR and FP relay.

In 75 there is a separate WUR relay that gets its power from the alternator, so the engine must be running. The factory manual says to run 12v directly to the WUR for the WUR pressure test.
Bill

Bill,

Where did you find this information? The FP for '75 (911) cars gets its power directly from the ignition switch when you turn it to ON position. Since you mentioned factory manual, refer to the flow current diagram, Type 911 USA, Model 75, and look at circuit #54. The factory manual I have shows otherwise. Please help me understand the discrepancy. Thanks.

Tony

[EngrBill]

Tony,

I agree that the FP gets its power from the ignition.

My comment was in regards to where the WUR gets its power. The 75 has a separate WUR relay.

Sorry to be slow getting back, I'm new to posting. This forum has been of tremendous help to me (including many of your posts). I recently decided to take control of my own work when repairs started becoming very time consuming.

Thanks,
Bill
Structural engineer, not electrical

[boyt911sc]

Originally Posted by EngrBill

Tony,

I agree that the FP gets its power from the ignition.

My comment was in regards to where the WUR gets its power. The 75 has a separate WUR relay.

Sorry to be slow getting back, I'm new to posting. This forum has been of tremendous help to me (including many of your posts). I recently decided to take control of my own work when repairs started becoming very time consuming.

Thanks,
Bill
Structural engineer, not electrical

Bill,

You're are correct indeed!!!!

Tony

[Paulporsche]

JW and Tony,

Thanks for correcting my misleading info.

[Kemo]

I enjoyed this post even tho some of it was kinda over my head

has anyone posted a CIS OVERHAUL thread? that would be a really cool book too.

heading to the search feature now...