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Old February 12th, 2020, 10:48 AM   #1 (permalink)
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Low Oil Pressure

I've looked through threads and did not see any recent info . I have a 2007 gs spyder , the low oil pressure light came on . Does anyone have any experience trouble shooting ? Is there a way to tell if it's a sensor or oil pump ? Car idles fine ... do not want to drive it until I get this issue fixed . Thanks !
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Old February 12th, 2020, 12:49 PM   #2 (permalink)
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An oil pressure sensor/tester is how you test properly.

If you want to throw money at the problem, step 1 is oil pressure switch, then pickup tube, then pump, then bearings. Not at all the right way
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Old February 22nd, 2020, 11:58 AM   #3 (permalink)
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Update. I replaced the oil sending unit aka oil pressure sensor. That was a major pita to get to. Ordered the part online , it did not look 100% identical 98% maybe .It was just a tiny bit longer. I noticed the oil filter ( a K&N ) was a bit narrower than the normal Purolator or Mobil 1 that I had been using . My plan was to drop the oil pan and inspect that also but after seeing the location and what was involved.. time did not allow that. After I installed the part and added oil , I removed battery leads and the car sat an hour or so until I was able to start it ( had other things to do ). At start , no low oil pressure light. Drove an hour or less , no light . Get up next day , drive to work , no light . Come to a stop about 20 minutes of driving.. rpms drop to normal idle .. Light comes on . Just tap the gas light goes out .. car drops idle .. Light goes on . Get to work check oil level , might be a bit lower than perfect. Add maybe 3 or 4 oz of oil .. start car drive home .. no light . Drove to and from work yesterday , no light . This is weird ! Oil couldnt be that low , maybe a weak connection or just a fluke ?
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Old February 22nd, 2020, 01:36 PM   #4 (permalink)
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Check your oil pressure. The oil pressure switch in the engine just means you have more than 5psi. It's not a sensor beyond that, and like you said, it could be an electrical issue

Throwing parts at it isn't the fix
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Old February 24th, 2020, 03:47 AM   #5 (permalink)
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I'm guessing you are saying the sensor is reading 5lbs or less? Other than adding a 2nd pressure gauge.. I am not sure how that is supposed to be done? I am not exactly a rookie and what I have dealt with in the past is trying cheapest parts 1st usually works . I realise throwing parts isn't always a fix... unless the parts being thrown fix the issue .
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Old February 24th, 2020, 09:44 AM   #6 (permalink)
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Go to any Autoparts store with a tool loan service
Borrow an oil pressure tester.

Then you'll have known right away if your pressure was actually low or if it was a bad switch
So that would have been cheaper already.
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Old February 24th, 2020, 12:28 PM   #7 (permalink)
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Quote:
Originally Posted by Sabertooth^2 View Post
Go to any Autoparts store with a tool loan service
Borrow an oil pressure tester.

Then you'll have known right away if your pressure was actually low or if it was a bad switch
So that would have been cheaper already.


Lol I did that for both of my GS the first one had terrible oil pressure after using the rent a tool from autozone due to my oil pressure light coming on and obnoxious valve ticking and while idling when I removed my oil cap the top of my engine just looked so damn bare with no oil to be honest.... long story short my pick up tube was not clogged my sensors did not fix it so I changed my oil pump along with the timing belt/water pump because why not while Iím down there..... and she sounds and works amazing ever since

Now my other GS whose oil pressure light came on almost simultaneously with the other did not even need ANY PARTS TO FIX THE LIGHT lol my car coming from up north had very bad rust and turns out the 1 connection to the oil pressure switch on the back of the block had corroded straight through the connections wire so when I went to check of the switch was loose or what not the wire literally just snapped in half and feel off so all I needed to do was find healthy wire with good connection and connect it to the switch and all is fine


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Old February 24th, 2020, 01:12 PM   #8 (permalink)
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On your brand new pump, have you measured your hot idle pressure?
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Old February 24th, 2020, 02:09 PM   #9 (permalink)
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On your brand new pump, have you measured your hot idle pressure?


That is new information to me bro..... so no I have not

What is that?


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Old February 24th, 2020, 04:15 PM   #10 (permalink)
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I'm just curious what your oil pressure is, at idle, when the engine is fully warmed up.

I've read many things about what the proper oil pressure is, but have never tested it with a brand new pump myself, so don't have any concrete data to support that 8psi is proper hot idle temperature (seems to be 8psi on 4G63, and 4G64, and I see that on mine at idle, but my pump has 100k miles on an otherwise brand new engine)
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Old February 24th, 2020, 07:59 PM   #11 (permalink)
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Quote:
Originally Posted by Sabertooth^2 View Post
I'm just curious what your oil pressure is, at idle, when the engine is fully warmed up.

I've read many things about what the proper oil pressure is, but have never tested it with a brand new pump myself, so don't have any concrete data to support that 8psi is proper hot idle temperature (seems to be 8psi on 4G63, and 4G64, and I see that on mine at idle, but my pump has 100k miles on an otherwise brand new engine)
Proper PSI once warmed up is ~8psi compared to the 5psi+ required to make the stock dash dummy light sensor happy correct?
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Old February 24th, 2020, 11:02 PM   #12 (permalink)
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Quote:
Originally Posted by Sabertooth^2 View Post
I'm just curious what your oil pressure is, at idle, when the engine is fully warmed up.

I've read many things about what the proper oil pressure is, but have never tested it with a brand new pump myself, so don't have any concrete data to support that 8psi is proper hot idle temperature (seems to be 8psi on 4G63, and 4G64, and I see that on mine at idle, but my pump has 100k miles on an otherwise brand new engine)


Well my new pump has about 5-10K on it so Iíll definitely check out the oil pressure on it and let you know


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Old February 24th, 2020, 11:15 PM   #13 (permalink)
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Proper PSI once warmed up is ~8psi compared to the 5psi+ required to make the stock dash dummy light sensor happy correct?
8psi is my finding, and matches my 100k mile pump. But I'm curious about a fresh pump. Unfortunately, it'll only tell half the story again, because of bearing wear lowering oil pressure. But it's still useful info for approximating normalities
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