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Old 06-25-2014, 09:37 AM   #1
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Oil issues

On a stock 86 stang that does have some leaks,( rear main, oil pan, etc) I'm getting crazy oil pressure readings, everything from 45 to 0 while driving normal in city. It has an aftermarket oil guage. I replaced oil pump and shaft about one year ago. I was told that the pressure fluctuating is probably due to motor being 28 yrs old, normal wear and tear and that it needs a rebuild. I'm going to connect a diff guage to see if the current one is bad, but just wanted to get everyone's .02!


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Old 06-25-2014, 12:29 PM   #2
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Mechanical or electric gauge?


Does it drop to 0 from 45psi?
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Old 06-25-2014, 07:27 PM   #3
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Mechanical...
It shows 45 at start up, after a couple mins drops to around 30-35. then while driving varies from 20 to 35 when in the throttle, when off throttle it drops to around 0,5,10,15...off throttle like slowing to stop or turning corner. While sitting at stop light it may drop to 5 then jump up to 20, then drop to 10...it's just very erratic.

Update, I switched the gauge out for a diff mech one, still getting same readings.

Also, I'm not getting any oil readings on dip stick...which is really weird?


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Old 06-25-2014, 07:41 PM   #4
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Could you be low on oil? (A serious question)
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Old 06-26-2014, 08:27 AM   #5
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I know it is low a little, b/c of the leaks, but unless I'm going through about a quart in 30 min of driving...it shouldn't be that low. I'm going to completely drain and refill today, I'll see what that does.

My guage used to read 55-60 on start up and it would only drop to about 45 after warmed up. When i saw it drop down to about 30-35, i would check oil and add as neccesary.


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Old 06-26-2014, 08:35 AM   #6
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It should never ever drop to 0. If it does you either have a bad gauge or the oiling system itself is shot. Do you still have the stock gauge too? When I had my 95 I piggybacked the stock and aftermarket sensors with a T fitting so if the aftermarket one **** the bed or dropped to 0 I could see if the stock gauge had clicked off to verify.

And if you are leaking oil you could try going to a higher weight or back to conventional if you are running synthetic. Ppl say you can't switch back from syn to conventional but I never had an issue doing it for higher mileage cars that had small leaks. Thicker/conventional will often get you some added miles out of a motor that is a little leaky with normal weight/syn.
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Old 06-26-2014, 08:46 PM   #7
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I've been running normal 20w50 for about 2 yrs...due to as Scotty mentioned in another post "fixing" the motor for a bit. And it has helped stop the bleeding some.

So, I'm the dip stick in this scenario...today I decided to do an oil change, and just start with fresh fluids. I added about four quarts, checked my dip stick and all of a sudden I was showing oil. So, basically rather than checking my oil every couple days or so I would drive the car until my pressure gauge was not getting to proper psi, then I would throw in a quart. I had done that for about a year only thing is in winter it was so cold that I never had to put any in due to less driving, less leaking, and oil not getting hot, so my guage was reading good even though it was nearly dry. By the time it started warming up outside I didn't realize there was almost no oil left...so again, I'm the idiot here, just glad I figured it out before I seized motor.
On another note, it ran for about two weeks without enough oil in it, never made a sound, never had any sign of low pressure( besides properly working gauge). Thanks Ford!! Hopefully someone will learn something from this blunder.

And before anyone mentions the damages that may have been caused by oil starvation, I'm just trying to keep it alive until I get my other motor finished to swap in.

Thanks to everyone...anybody need an oil press gauge, I've got an extra now! Haha


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Old 06-26-2014, 10:34 PM   #8
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I hope you know that your car will take 5 quarts with and oil and filter change.
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Old 06-27-2014, 08:11 PM   #9
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Yes, I do, I was just checking the dip stick after four to see if there was a reading.


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Old 06-30-2014, 06:11 PM   #10
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Their are numerous problems you could be having.
1) when you replaced the oil pump, could I be possible their is a fracture in the cast from over tightening. This has happen to me personally. when it's cold good oil pressure, when it gets hot the crack or leak widens and the pressure goes down to 0-4 psi.

2) 86 blocks like to split down the cam journals which will make it smoke a bit and fluctuating oil pressure.

Either way if your oil pressure hits 0 it maybe time for a rebuild. And if you choose that make sure the block get magnafluxed befor you do anything.

Just my 2 cents. 86 gr8 driver to another

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---------- Post added at 11:11 PM ---------- Previous post was at 11:10 PM ----------

Gt*

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