From: Kenneth Mackenzie <kmackenz@u.washington.edu> I was driving the van about 1 week ago down a major arterial, and the oil pressure light/buzzer came on. The van has about 99K miles. The short story is: oil level is ok and the engine is not overheated. I heard no knocking ( although now all I remember is the buzzer). I parked the van asap and let it sit I really don't know anything about engines, but I am used to debugging computer programs. From your notes, I see that: M1: Oil light comes on Oil pressure with warm engine 0.5 bar M2: Oil light does not come on Oil pressure at 3000 rpm 2.0 bar M3: Oil light does not come on Oil pressure at 3000 rpm 30 psi ~ 2.0 bar The problem is intermittent, but real, and the sensor is good. I have a VW Golf with a similar problem: When driven warm at medium RPM (which means it happens only on vacations, in the mountains) the oil pressure warning comes on and stays on. It only happens after a half hour of driving and the mechanics insist that they absolutely cannot duplicate it however detailed instructions I give them. I first saw it the day after I picked it up new in 1985, and since it has survived for 10 years, I guess I should stop worrying about it, but it still scares me when it starts, every year, on the second day of vacation, halfway up the Sierra Nevada ... My vision is that a piece of lint rag or something is floating around in the engine block channels and half blocks the channel in front of the pressure sensor. / Lars Poulsen - 85 Golf, 87 Westy
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