fluctuating oil pressure
#1
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Join Date: Nov 2004
Location: Boston
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fluctuating oil pressure
On my 86 na the oil pressure always fluctuates at idle. When cold it is pretty steady at 4-5 bar, however when fully warmed up it'll fluctuate violently between 1-2 bar. I am now running 20w-50 oil, before when I was running 10w-40 the fluctuation was even more violent. With throttle application the fluctuating goes away. Engine pulls good, sounds good, and I found no metal during my last oil change. What is the problem?
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#9
Rennlist Member
I'm also runnig a heavier weight oil, 15w50 Mobile 1. When cold, the oil pressure at idle will sit at 5 bar or slightly below. I figure this is pretty good.
When all warmed up, like after 20 minutes driving, it'll sometime go as low as just a hair over 2 bar at idle. Always steady, not moving up and down. It struck me as 2 bar is a little low. Do I need to be concerned?
When all warmed up, like after 20 minutes driving, it'll sometime go as low as just a hair over 2 bar at idle. Always steady, not moving up and down. It struck me as 2 bar is a little low. Do I need to be concerned?
#10
Mine started doing something very similar this afternoon. It was running fine and I went shopping, was in the store 20 minutes, came out and the car started fine but the idle was uneven,
Here is a link to a video of what it does Video
A tap on the trottle and it goes away. I have not confirmed if it does it cold.
Any ideas?
'90 S2
Here is a link to a video of what it does Video
A tap on the trottle and it goes away. I have not confirmed if it does it cold.
Any ideas?
'90 S2
#11
Originally Posted by CCCP
I've been told that a fluctuating oil pressure is the result of my rod bearings going bad. Anyone second that idea?
Mike Dayton
#12
my '87 does the same thing, the needle bouces at idle it seems the wise thing to do is the simple things first, clean contacts... change sender... then if it persists look for more serious problem.
#13
It doesn't explain why a small tap on the trottle fixes the problem. This means that the sender is ok.
I checked Clarks-Garage on this and the only thing he has is a writeup on ajusting the idle but, as I learned, the S and S2 do not need adjustments because they have "adaptive idle speed volumetric efficiency regulation"
Wow that's a mouthfull
I checked Clarks-Garage on this and the only thing he has is a writeup on ajusting the idle but, as I learned, the S and S2 do not need adjustments because they have "adaptive idle speed volumetric efficiency regulation"
Wow that's a mouthfull