I have a 1991 extra cab pickup with a 22RE engine. It is a 5 speed manual with about 134k miles on it. I've had no problems with it but now I've noticed the oil pressure gauge registers a low reading when I'm driving.
The gauge used to hover around the middle range but now hovers around the "L" end except for brief sweeps into the middle range but then it drops back down to the lower "L" side.
My questions are:
1) what can cause this? 2) What troubleshooting steps should I take to determine the cause? 3) Has this happended to anyone else and what did you do to fix it? 4) Could it be a bad sending unit?I use Castrol 10W30 oil and change it religiously at 3,000 miles and use a Toyota filter. It drives fine despite the low oil pressure readings but it worries me.
Thanks in advance for any advice/tips...
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