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Old 25-10-2007, 10:38 AM   #1
xr8driver
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Default Loosing Oil Pressure

Hi guys i have a AU 5.0L, and i am loosing oil pressure when my car gets to normal running temperature and idling at the lights, but then builds back up to normal once cruising. I also noticed this is made worse when the aircon is on.

I did the normal things, checked oil, its full! And theres no leaks anywhere.

Any suggestion?? Oil sender? Oil to thin? another earth?

thanks guys

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Old 25-10-2007, 11:30 AM   #2
jeffb
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Could be anyting from bad oil/sender to worn main bearings, first thing to try would be to change the oil, maybe use something a bit thicker, I run 20w in mine.
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Old 25-10-2007, 12:02 PM   #3
OzJavelin
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Is the HOT oil pressure level lower than "normal" (when HOT) or are you just noticing the usual difference between COLD and HOT oil pressure?

I'd be getting the COLD and HOT pressure checked with a proper, external gauge before I'd be getting to worried ...
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Old 25-10-2007, 12:09 PM   #4
xr8driver
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Quote:
Originally Posted by OzJavelin
Is the HOT oil pressure level lower than "normal" (when HOT) or are you just noticing the usual difference between COLD and HOT oil pressure?

I'd be getting the COLD and HOT pressure checked with a proper, external gauge before I'd be getting to worried ...
The HOT oil pressure in not lower than normal when driving but once stationary for a short period of time it slowly begins to drop sometimes to the point the warning light comes on.
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Old 25-10-2007, 12:21 PM   #5
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test the oil pressure with a proper oil gague first
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Old 25-10-2007, 12:40 PM   #6
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Is it series 1? Ford know about it, it's a faulty earth wire. The can replace it but will cost you for labour. My series 1 TE50 did the same thing.
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Old 25-10-2007, 12:49 PM   #7
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yep series 1 mate
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Old 25-10-2007, 01:11 PM   #8
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Cool, as I said it's almost certainly just the earth wire. When mine did it I had it tested and had the sender unit replaced only to find out that it was a 20c wire.
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Old 25-10-2007, 02:48 PM   #9
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Same thing happened with my fairmont,

Faulty earth wire, replaced and bingo fixed!

If it doesn't work then move to testing other things.
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