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Oil Pressure Light 700 1991

posted by  Don Foster on  Sun Nov 9 10:55 CST 2003
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last visit: Sun Oct 5 11:53 CST 2014
[RELATED]

First, be sure it's not a bad wire (worn insulation) at the sender. But by 1991, Volvo had solved that problem.

If the wire's OK, then I'd be suspicious of a worn engine OR a bad O-ring on the delivery tube. I have to say that I've not heard of the O-ring problem on newer engines.

Also, you must confirm that the sender is responding accurately. For this, you should arrange to install a real pressure gauge (on a 6'-8' hose so you can see it while you drive). Then you can accurately monitor the pressure under differing conditions.

161k isn't much. My '91 740 has about 235k, or so, and we see absolutely no indication of a hot oil pressure problem.

And also.... 550-600 rpm idle is a tad low. I'd expect it to be more like 850.
--
Don Foster (near Cape Cod, MA)






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