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Mechanic is looking for work
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Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Wed, 18 May 2005 06:20:54 Share Post by Email
In Reply to: Oil Pressure Light, Saab Fan, Tue, 17 May 2005 16:30:40
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The oil light coming on at any time when the engine is running is a bad sign. What can cause it? Low oil pressure, weak sensor, wire from sensor intermittently shorting to ground. #2 and #3 are no big deal, but #1 will cost you the engine.

When does it happen? In corners? At idle only? When hot or cold?

To back up Mr. Sho, you should get the oil pressure checked with a mechanical gauge. I'd expect up around 40 psi with a cold engine, and over 20 psi warm, over 2000 rpm. With really warm oil, at idle, it may drop as low as 10 or 12 psi. If the oil pressure is low, it is most likely a weak spring in the oil pressure bypass valve. It could be a worn oil pump, but that is very rare.

If it occurs in corners or under acceleration, it could be low oil level, or sludge partially blocking the oil pickup tube. Any of those can kill the engine.

If the sensor is failing, it may cause the light to flicker when warm and idling. If the wire from the sensor is chafing on the chassis, and has worn through and is intermittently shorting, that can cause the light to flash.

The downside of low oil pressure is a destroyed engine. I can't imagine a responsible mechanic saying that a flickering oil light is OK. Now, if he's measured the oil pressure and knows it is good, saying it's not an issue is reasonable, but (1) he should explain why, and (2) FIX THE OIL PRESSURE sender. A broken sender is pretty bad - if you do have an oil pressure problem, you won't know it until the engine expensively stops.

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