franky
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 posted on 10/4/11 at 09:14 PM |
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oil pressure questions
The first time I let my car get properly warm and let the oil temp get up it flashed low oil pressure a couple of times at tickover. Tonight when
running in the garage, I gave the car a rev and the low oil pressure light came on again when the rev's dropped.
I switched the car off, then with the fuel pump turned off I turned the car over, oil pressure when straight back up. When the car was started
again the oil pressure was fine at tickover and when revving.
I've a new oil pump/sump/oil cooler/oil cooler hoses on the engine so I take it that i've got a couple of little air locks that are slowly
clearing themselves?
If I'm wrong what could be the issue? Or how can I speed up the above?
Thanks in advance.
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RazMan
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| posted on 10/4/11 at 10:42 PM |
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I found my oil pressure sender needed a few heat cycles to start operating properly - it gave me a few heart flutters until it sorted itself out.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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coyoteboy
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| posted on 11/4/11 at 12:11 AM |
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My sincere opinion is that you should have an oil pressure gauge, not just a light. My light comes on quite regularly at 12psi when the engine is hot
and idling, factory lowest limit is 4.3psi when idling.
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laptoprob
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| posted on 11/4/11 at 06:27 AM |
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As above. Forget the light and buy a gauge. Its common for the light to flicker at low revs in kit cars etc as the tickover is very irregular compared
to a production car. Ive seen it come on after fitting a brand new race engine so always fit a gauge now to check everything is ok and put my mind at
rest.
http://www.youtube.com/watch?v=ajlF4nWJtGA
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franky
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| posted on 11/4/11 at 07:00 AM |
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I should have said, its got an oil pressure gauge, I've just set an alarm light to come on at 6.7psi like in the standard car. I can watch
the pressure rise and fall with revs, then every so often drop below the minimum.
All sensors are working perfectly and a pressure tester show's the same results.
Tickover is exactly as in the donor car as i'm using the donor ecu etc etc.
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ashg
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| posted on 11/4/11 at 08:24 AM |
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how low it is actually dropping on the gauge? to be honest as long as you have a bit of oil pressure at idle it should be fine, if its reving high
and losing pressure then i would be worried. if it does it at high rpm i would have the sump off and check that none of the seals/o-rings on the pump
etc are split caught.
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franky
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| posted on 11/4/11 at 09:46 AM |
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dropping to 1.5psi at idle once warm now....
sensor is fine, it actually did say 0.0psi at idle, 1500rpm gives it 15psi and it rises to a max of 67psi at 7500rpm.
Does it seem like bearings may be on the way out?
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David Jenkins
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| posted on 11/4/11 at 09:48 AM |
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Oil pressure relief valve sticking open?
This happened on my crossflow, and caused me to miss my first SVA appointment. 
Had I know what it was on the day I could have fixed it in 10 minutes...
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