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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / September 20051990 Jetta oil pressure.......?
So recently, I bought a 1990 Jetta that runs, but makes a lot of noise. (Some of this is due to a hole in the muffler.....) I changed the oil over to synthetic, bacause it's over 100k miles. But since I changed it, the oil pressure buzzer has been coming on intermittently. If I remember correct, the buzzer signifies high pressure, but I don't know what causes it. So, assuming my pressure switch isn't going bad (which is a common problem in VW's, I hear), what causes high oil pressure, and how do I fix it? I'd like ths car to make it on a 200 mile trip I'm taking soon, but I don't want to drive it into the ground doing so! I'd be surprised if it were for high oil pressure, most likely low oil pressure. Oil pressure is highest when engine is cold and will drop off when hot. In GM cars 15 PSI at idle when hot is considered OK. If the buzzer comes on when hot at idle it may indicate worn bearings. If you used the incorrect weight of oil it can cause low oil pressure. I assume that there is not an oil pressure gage. > So recently, I bought a 1990 Jetta that runs, but makes a lot of noise. > (Some of this is due to a hole in the muffler.....) [quoted text clipped - 9 lines] > I'd like ths car to make it on a 200 mile trip I'm taking soon, but I > don't want to drive it into the ground doing so! Almost forgot... VW engines of that era like thick oil, you should be using a xW40 or xW50 oil. 10w30 does not cut it on a VW especially if it has some miles on it. nate > I'd be surprised if it were for high oil pressure, most likely low oil > pressure. Oil pressure is highest when engine is cold and will drop off when [quoted text clipped - 17 lines] > > I'd like ths car to make it on a 200 mile trip I'm taking soon, but I > > don't want to drive it into the ground doing so! Now that's interesting. I threw in 5w30. Am I actually doing damage by using this oil, or is it just setting off the oil pressure sensor? > Now that's interesting. I threw in 5w30. > > Am I actually doing damage by using this oil, or is it just setting off > the oil pressure sensor? Probably not doing any damage but I know that my old 16V would exhibit some lifter clatter (but not light the light) when hot. nate > So recently, I bought a 1990 Jetta that runs, but makes a lot of noise. > (Some of this is due to a hole in the muffler.....) [quoted text clipped - 9 lines] > I'd like ths car to make it on a 200 mile trip I'm taking soon, but I > don't want to drive it into the ground doing so! Buzzer = low pressure your car actually has a dynamic oil pressure sensing setup, which uses two sensors, one in the oil filter housing and one in the head. It checks for a certain pressure at all times and a higher pressure above 3000 RPMs. The circuitry for this is built into the instrument panel. You could have a bad sensor (or two) or a bad IP, or an actual low oil pressure problem. If you haven't already you might want to post to rec.autos.makers.vw.watercooled someone there can probably point you toward a web site with more information on this system and/or how to defeat it entirely and install a mechanical gauge. As a reality check you may wish to just install a gauge at the head and see what you pressure really is, to make sure that you don't have a problem. Rule of thumb is 10 psi/1000 RPM although I believe VW has their own specs which are published in the Bentley manual. good luck, nate |
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