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14-02-2014, 12:42 AM | #1 | ||
FF.Com.Au Hardcore
Join Date: Jun 2005
Posts: 588
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There is a vaccuum tube behind a small vent at the top left of the clock. Today it started audibly hissing, the level changing with engine load.
With the message display centre removed I can put my fingertip on the tube and it will stick within a couple of seconds so it has decent suction. Maybe TOO much suction, like there's a vac pipe blocked somewhere else? Since the hissing started this has also happened: - Twice the transmission held first longer than normal, and when it did change to second it was quite hard. - Once the trans/diff did a 'clunk' when pulling up to a stop. But apart from that: - Engine is idling fine. No surging, no stalling, no RPM wandering aimlessly. - Power and response seems to be normal. - No obvious vac leaks within the engine bay. - Transmission only played up the 3 times out of a couple of hundred gear changes. Could be coincidence. Any ideas why this tube has suddenly started making some noise? (Note it is actually a tube inside the MDC, nothing to do with the climate control actuators further inside the dash) |
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14-02-2014, 04:23 PM | #2 | ||
CNC fixer guy
Join Date: Sep 2006
Location: Melbourne Vic
Posts: 609
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I don't think I can recall any vacuum lines to the MDC /climate control unit, but I do know that a lot of temperature sensors in climate control units work by sampling the cabin air with a small fan or vacuum pump which draws air past a temp sensor.
Are you sure the noise isn't caused by a noisy suction fan/pump in the MDC?
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Weekend Toy: S1 AU Fairlane V8 with LTD bits, Tickford 17" wheels, front and rear chin spoilers, series 2 front brake conversion with Super pro bushes, Pacemaker headers, rear muffler removed, Kings/Pedders lowered suspension, Koni adj rears, painted headlight bezels, HR 2300kg hitch, 2 stage shift kit, trans cooler, reverse cam and media player. Wife unit's : 2010 update FG XR6, reverse cam, HR 2300kg Hitch, German Maestro speakers, parcel shelf sub, trimmed mudflaps, batman stickers. Last edited by mif73; 14-02-2014 at 04:41 PM. |
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14-02-2014, 10:24 PM | #3 | ||
CNC fixer guy
Join Date: Sep 2006
Location: Melbourne Vic
Posts: 609
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Well i just pulled out my mdc and guess what? There is a vac line plugged into it.
It looks like it is there to draw air over the cabin temp sensor thermistor. I unplugged the fitting and there is a black filter type material on the end of the hose.
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Weekend Toy: S1 AU Fairlane V8 with LTD bits, Tickford 17" wheels, front and rear chin spoilers, series 2 front brake conversion with Super pro bushes, Pacemaker headers, rear muffler removed, Kings/Pedders lowered suspension, Koni adj rears, painted headlight bezels, HR 2300kg hitch, 2 stage shift kit, trans cooler, reverse cam and media player. Wife unit's : 2010 update FG XR6, reverse cam, HR 2300kg Hitch, German Maestro speakers, parcel shelf sub, trimmed mudflaps, batman stickers. |
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15-02-2014, 01:04 AM | #4 | ||
FF.Com.Au Hardcore
Join Date: Jun 2005
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15-02-2014, 09:32 AM | #5 | ||
CNC fixer guy
Join Date: Sep 2006
Location: Melbourne Vic
Posts: 609
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The filter was on the hose end, not on the mdc fitting itself.
__________________
Weekend Toy: S1 AU Fairlane V8 with LTD bits, Tickford 17" wheels, front and rear chin spoilers, series 2 front brake conversion with Super pro bushes, Pacemaker headers, rear muffler removed, Kings/Pedders lowered suspension, Koni adj rears, painted headlight bezels, HR 2300kg hitch, 2 stage shift kit, trans cooler, reverse cam and media player. Wife unit's : 2010 update FG XR6, reverse cam, HR 2300kg Hitch, German Maestro speakers, parcel shelf sub, trimmed mudflaps, batman stickers. |
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15-02-2014, 11:43 PM | #6 | ||
FF.Com.Au Hardcore
Join Date: Jun 2005
Posts: 588
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Hmm... can you explain that a bit better? If you disconnect the hose from the MDC the filter is between the connector and the rubber hose? Still don't get it.
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16-02-2014, 12:33 AM | #7 | |||
CNC fixer guy
Join Date: Sep 2006
Location: Melbourne Vic
Posts: 609
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Quote:
I will see if i can take a pic tomorrow for you.
__________________
Weekend Toy: S1 AU Fairlane V8 with LTD bits, Tickford 17" wheels, front and rear chin spoilers, series 2 front brake conversion with Super pro bushes, Pacemaker headers, rear muffler removed, Kings/Pedders lowered suspension, Koni adj rears, painted headlight bezels, HR 2300kg hitch, 2 stage shift kit, trans cooler, reverse cam and media player. Wife unit's : 2010 update FG XR6, reverse cam, HR 2300kg Hitch, German Maestro speakers, parcel shelf sub, trimmed mudflaps, batman stickers. |
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