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

11,705

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 of 2 people found this helpful.
5,615

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 of 1 people found this helpful.

Your Answer

Pickup

Looking for a Used Pickup in your area?

CarGurus has 108 nationwide Pickup listings and the tools to find you a great deal.

ZIP:

Toyota Pickup Experts

  • #1
    Reelin68
    Reputation
    1,230
  • #2
    wabbo369
    Reputation
    680
  • #3
    LouB
    Reputation
    440
View All

Related Models For Sale

Used Toyota 4Runner
255 Great Deals out of 21,579 listings starting at $2,300
Used Ford F-150
2,151 Great Deals out of 181,811 listings starting at $1,000
Used Ford Ranger
167 Great Deals out of 5,505 listings starting at $1,000
Used Nissan Truck
94 listings starting at $3,500
Used Toyota Corolla
888 Great Deals out of 64,966 listings starting at $999
Used Toyota Land Cruiser
12 Great Deals out of 1,011 listings starting at $2,650
Used GMC Sierra 1500
800 Great Deals out of 67,591 listings starting at $1,350
Used Toyota Camry
1,099 Great Deals out of 70,608 listings starting at $750

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.