Oil Light Flicker during D <--> R gear change - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 18 (permalink) Old 12-19-2016, 08:37 PM Thread Starter
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Oil Light Flicker during D <--> R gear change

Okay Mazda geniuses,
This little niggle popped up today and then disappeared.
The Car: 2004 M6 Wagon 3.0, 167,000mi, ATX (JATCO 5spd). Oil: Castrol High Mileage syn/blend 5W20 (changed every 3000, currently with 1200mi), car will consume about 1 1/8-1 1/4 qt every change, same for 3yrs) No issues other than lower control arm bushing wear. pre-cats replaced at 126,000mi along with, PVC, COP's and Plugs.
Scenario: Making a 3-point turn on a slight slope I noticed a faint momentary flicker of the oil light when switching from R to D. I moved to park on flat ground and tried it again. D to R saw a faint momentary flicker of the oil light. I happened when I moved D -> R and R -> D. A momentary flicker (not enough to fully illuminate the light then gone. Checking the oil show a full pan with good color and smell.

Any ideas?

Thanks everyone for reading. Happy Holidays

Edit, this popped up again in Oct 2018 (180,000mi) and then again in Feb 2019 (both times at hot idle)


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post #2 of 18 (permalink) Old 12-19-2016, 11:07 PM
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Start with the oil pressure switch, that is usually the suspect on older car. If that doesn't help, then i'm afraid the news is not very good. You either have sludge or an oil pump that is on its way out.
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post #3 of 18 (permalink) Old 12-20-2016, 03:23 AM
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I would try hooking up an analog oil pressure Guage and verify the actual oil pressure reading.
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post #4 of 18 (permalink) Old 12-20-2016, 08:15 AM
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Quote:
Originally Posted by waughoo View Post
I would try hooking up an analog oil pressure Guage and verify the actual oil pressure reading.
This is the only way to truly know what is going on in terms of pressure.

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post #5 of 18 (permalink) Old 02-16-2019, 06:58 PM Thread Starter
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Oil Filter Sandwich Plate with OEM Pressure Sender

Hello again. I forgot I had posted this issue until I was searching for a solution to my next step.

The oil light started flickering at idle again and I have decided to move forward in trying to diagnose/remedy it.

I cannot take my OEM oil pressure switch (OPS) out for mechanical pressure testing because the previous owner stripped it in place. It does not leak and I am not touching it again. I do however want to verify the oil pressure is adequate, and if so, extinguish my epileptic oil pressure light at the same time.

I have purchased an oil pressure sandwich plate (M22 - 1.5) from GlowShift. There are 4 ports (3/8"-24) on the plate and I would like to put a new OEM sender switch (and possibly temperature and pressure gauges) which is a M14 x 1.5 pitch)

The symptom has been presenting itself sporadically(3x) for over 2 years so it is not likely moving very fast but I will still verify actual pressure using one of the plate ports before investing in a gauge set.

I need to put a (Male) M14 x 1.5 (OPS) into a (Female) 3/8"-24 (sandwich plate). An adapter for this does not exist.
My options as I see them are:
1. Try tapping a [3/8"-24 to 9/16"-18] to a [3/8"-24 to M14 x 1.5). Not sure if I can go 9/16-18 to M14x1.5 but something like that.
2. Try finding a compatible sender that will fit the sandwich plate and send appropriate voltage to keep light off (voltage unknown).
3. Run a mechanical gauge and cut the LED off the speedometer instrument board.

What I want is the OEM sender communicating with the light as it is supposed to and possibly running gauges as well.

Could I use the oil pressure sender supplied with a gauge to communicate with my OEM oil light?

Any thoughts/suggestions people may have are welcome.


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post #6 of 18 (permalink) Old 02-16-2019, 07:25 PM
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@DrFeelGood I donít think that the aftermarket sender would work with the OEM system my reasoning here is that the OE switch is, I believe, basically an on/off switch set at specific pressure by the factory, while the aftermarket one is designed to report the exact pressure.


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post #7 of 18 (permalink) Old 02-16-2019, 07:29 PM Thread Starter
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Quote:
Originally Posted by bluedevil6 View Post
@DrFeelGood I donít think that the aftermarket sender would work with the OEM system my reasoning here is that the OE switch is, I believe, basically an on/off switch set at specific pressure by the factory, while the aftermarket one is designed to report the exact pressure.
That is my suspicion as well.
Back to our previously specified dilemma..


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post #8 of 18 (permalink) Old 02-16-2019, 07:34 PM
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Quote:
Originally Posted by DrFeelGood View Post
That is my suspicion as well.
Back to our previously specified dilemma..


Just a thought, but I wonder if you could possibly find a pressure switch from another vehicle with the thread size you need, or at least one that you could find an adapter for. Theoretically if itís just an on/off switch I would think another one could work if its is designed at a relatively similar pressure.


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post #9 of 18 (permalink) Old 02-16-2019, 07:43 PM Thread Starter
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Quote:
Originally Posted by bluedevil6 View Post
Just a thought, but I wonder if you could possibly find a pressure switch from another vehicle with the thread size you need, or at least one that you could find an adapter for. Theoretically if itís just an on/off switch I would think another one could work if its is designed at a relatively similar pressure.
This would be great but where to start? It seems like a daunting task to try and find service manual values for any sender that I may suspect fit and how do I begin finding the thread dimensions without having the part?


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post #10 of 18 (permalink) Old 02-16-2019, 07:51 PM
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Quote:
Originally Posted by DrFeelGood View Post
This would be great but where to start? It seems like a daunting task to try and find service manual values for any sender that I may suspect fit and how do I begin finding the thread dimensions without having the part?


Iím having the same thought, Iím tying to come up with an easy solution, but Iím quickly running out of ideas. Short of taking the sandwich plate to a scrapyard and spending hours pulling random senders I canít think of anything else. Its probably a long shot, but maybe try to look up senders from some common vehicles and see if any would work? Iím not really seeing an easy solution here unfortunately. It always is a bummer when people damage things that are so difficult to repair (such as your stripped sender).


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