What would cause a drop in coolant temperature and an increase in oil pressure?

10

Asked by Oct 28, 2016 at 11:41 PM about the 1990 Toyota Pickup 2 Dr Deluxe 4WD Extended Cab SB

Question type: Maintenance & Repair

Today took my 90 Toyota 4x4 w/3.0 for a short 14 mile round trip drive.  
On my way to my destination I noticed the coolant temp was lower and the
oil pressure was higher then they should be given the distance.  When I
started the truck back up for the drive back, the coolant temp and oil
pressure were correct, then a few miles in noticed the coolant temp drop
and oil pressure rise, then fall back to normal points.  The after market
gauges and oem gauges both did the same thing.

3 Answers

12,825

It sounds like you may have a thermostat hanging up. Cooler engine temperatures will maintain a higher viscosity of the oil which would be the cause of the high oil pressures. Gauges are probably correct if you have aftermarkets matching the OEM's.

2 people found this helpful.
6,265

Thermostat, and stick to 10-w-30~

10

Have always ran 10/30 in it since it was new. Went ahead and pulled the t-stat, and it appears the inner gasket let go after 12yrs(abut 14k miles), and caused the valve to stick partially open, preventing the engine from warming up. Replaced it today with a new oem t-stat, and all gauges were back within their normal range. Thanks.

1 people found this helpful.

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