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Do you know your sludge status?
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Posted by iveand [Email] (#3155) [Profile/Gallery] (more from iveand) on Fri, 20 Feb 2004 11:19:42 Share Post by Email
In Reply to: Engine Oil Light Comes on When I Stop, Paul [Profile/Gallery] , Fri, 20 Feb 2004 10:46:19
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Mine was doing the same thing (after I replaced the oil pressure sensor). It would flicker on and off when warm at idle speeds, and only occasionally did this.

I found sludge under the valve cover, and assumed that there was "gunk" in the oil that was blocking the pick up screen, thus causing the pressure light to come on. My theory on why it only happened warm: because when "cold" maybe the gunk was thick enough to be stuck in the bottom of the pan. When it warmed up, it loosened up and was free to move about and block the pickup screen. The idle speeds didn't have the pump working as hard .. that is why it only flickered at idle speeds. Higher RPMs must have been enough pumping action to suck through the buildup on the screen. Sound possible?

I also was losing a bit of coolant into the oil (headgasket). This could be what led to sludge, but it certainly made some gooey chunks that came out of the oil after doing an oil flush.

FYI - before transferring my oil to another container, I filtered it through a mesh screen I put in the funnel. That is how I saw these gooey chunks that had come out. Also a LOT of grit and grime (coffee grounds).

I am not sludge free yet, but no more oil pressure sensor light! I am going to be doing the auto-rx treatments to hopefully completely clear things up.


iveand
96 900S 128K

posted by 64.210.6... 
_______________________________________
2006 9-3 Aero SC 2.8T 6-speed (current)
1990 900 SPG 2.0T 5-speed (current)
1985 900 2.0T 5-speed ("DOA" donor car)
1985 900 2.0T 4-door 5-speed (gifted to friend, RIP)
1996 900S 2.3L 5-speed (gifted to friend, RIP?)
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