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Join Date: Jun 2007
Location: Beavercreek Ohio
Posts: 33
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This is strange
I walked out into the garage this morning and hear a humming noise coming from under the hood. I assume that its the turbo coolant pump running. I pop the hood and see that the coolant in the expansion tank is bubbling and gurgling. The car hadn't been started for over 24 hours when I had just finished washing the engine bay. Anyone have any idea whats going on?
Thanks.
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Danny 1987 Porsche 951 2003 Kawaski ZX-12R 2008 Kawasaki Concours 1400 |
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07-22-2013, 07:47 AM
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Join Date: Nov 2004
Posts: 359
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Only two? Wires going into the after run pump. You have a short or a bad sensor.
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07-22-2013, 09:10 AM
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Location: Beavercreek Ohio
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Yeah, its definitely the cooling pump. I think it must have had something to do with washing the engine bay since I didn't have the problem before
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Danny 1987 Porsche 951 2003 Kawaski ZX-12R 2008 Kawasaki Concours 1400 |
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07-23-2013, 04:34 AM
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There is no substitute..
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Remove the relay.. test it.. you be fixed! The pump is suppose to run 30secs after the engine shutdown.. and then stop.
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--Matt I couldn't find the sports car of my dreams, so I built it myself Porsche 951 1988 - More than 305 RWHP & 350 RWTorque |
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07-23-2013, 02:23 PM
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Location: Beavercreek Ohio
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Got everything dried out and the pump is shutting off like it should now.
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Danny 1987 Porsche 951 2003 Kawaski ZX-12R 2008 Kawasaki Concours 1400 |
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07-23-2013, 05:31 PM
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Join Date: Feb 2003
Location: SF East Bay
Posts: 1,856
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Most likely a wet cable on the temp-sensor shorted the plug to ground and triggered the relay to run the pump.
The turbo water-pump relay doesn't initiate anything, it only responds to inputs. Two triggers set off the relay to power the pump for 25-seconds. The first trigger is power-OFF when the DME relay cuts power when you turn the key to OFF. This triggers the relay to run for 25-seconds. The 2nd trigger is the turbo water-temp switch/sensor, which grounds the sensor wire at 244F. This triggers the relay to run the water-pump for 25-seconds. After that, the state of the sensor-wire determines what happens next. If temps are still above 188F, the sensor still grounds the wire and the relay will still run for another 25-seconds. Then the sensor-state determines what happens next, >188F, wire is still grounded and water-pump continues to run... etc, etc, etc. The sensor is a fan-switch, it goes ON and grounds at 244F, then goes OFF and disconnects at 188F. Anything in between that after the initial 244F and the water-pump will still be running. It's an OR circuit that triggers the relay for 25-seconds: 1. DME-relay power to injectors/fuel-pump is ON then goes to OFF OR 2. turbo water-pump sensor hit 244F AND is still above 188F. BTW, the pump is a low-load motor, it takes about 3-days to run down the battery. Last edited by DannoXYZ; 07-25-2013 at 06:29 AM.. |
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07-25-2013, 06:14 AM
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Matt's Porsche
Porsche 996
