Oil pressure drop at idle, only in drive and when warm????


Mattl12

New member
Joined
Jul 12, 2019
Messages
6
Reaction score
0
Points
1
Location
Louisiana
Vehicle Year
1990
Make / Model
Ranger 2WD
Transmission
Automatic
1990 Ford Ranger 2.9 V6
73000 miles
Heads and head gaskets recently changed, cooling/radiator system almost entirely new as well.
Changed the Oil pressure switch already. Changed oil and filter yesterday, high mileage synthetic blend 10W-30. Drop off only happens when warm and in drive, hitting the gas makes pressure go backup. No change in sound/noise. Just got first hiccup/vibration today.


Haven't guaged the oil pressure yet. OBD connection is clogged as it was opened the first time today, needs to be cleaned so I have no codes.


Thoughts????
 


Rock Auto 5% Discount Code: 248EE46702D889 Expires: October 1, 2019

adsm08

Well-known member
Supporting Member
Ford Technician
TRS 20th Anniversary
Joined
Sep 20, 2009
Messages
31,646
Reaction score
1,022
Points
113
Location
Dillsburg PA
Vehicle Year
1987
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
4.0
Transmission
Manual
2WD / 4WD
4WD
Tire Size
31X10.50X15
Sounds like it is time for an HV oil pump.
 

Mattl12

New member
Joined
Jul 12, 2019
Messages
6
Reaction score
0
Points
1
Location
Louisiana
Vehicle Year
1990
Make / Model
Ranger 2WD
Transmission
Automatic
Isn't replacing an oil pump on a 2.9 ranger a major job???
 

Mattl12

New member
Joined
Jul 12, 2019
Messages
6
Reaction score
0
Points
1
Location
Louisiana
Vehicle Year
1990
Make / Model
Ranger 2WD
Transmission
Automatic
Would you drive it or is this a park it and tow ordeal?
 

alwaysFlOoReD

Forum Staff Member
Forum Moderator
TRS Banner 2012-2015
TRS 20th Anniversary
Joined
Apr 13, 2009
Messages
8,780
Reaction score
215
Points
63
Location
Red Deer, Canada
Vehicle Year
'91, '94, '80
Make / Model
Ford, GMC
Engine Size
4.0,4.0,350
Transmission
Manual
I would put a real gauge on there and see what it says.
 

Paulos

Active member
Joined
May 7, 2018
Messages
163
Reaction score
44
Points
28
Location
North Carolina
Vehicle Year
1987 STX
Make / Model
Ford
Engine Type
2.9 V6
Engine Size
2.9L
Transmission
Manual
2WD / 4WD
4WD
Tire Size
235x55x18
Mine has 300K+, runs at 40psi on the highway and sometimes 15-20psi at idle. Surprisingly, I have no ticking noise. I just don't stay still long enough for it to sit and idle much when it's warm :). Mine needs a rebuild. And cam bearings.
 

Mattl12

New member
Joined
Jul 12, 2019
Messages
6
Reaction score
0
Points
1
Location
Louisiana
Vehicle Year
1990
Make / Model
Ranger 2WD
Transmission
Automatic
I would put a real gauge on there and see what it says.
Don't own a gauge and don't know what to look for/read it if I did. Gauge plugs in right where the pressure switch I just replaced screws in right? What I'm finding is the switch says there is pressure over 5 or 0 pressure (Dashboard "Gauge") and nothing else. Unless the repair costs are significant enough to junk the truck I will put on an after market "True Gauge".
 

Mattl12

New member
Joined
Jul 12, 2019
Messages
6
Reaction score
0
Points
1
Location
Louisiana
Vehicle Year
1990
Make / Model
Ranger 2WD
Transmission
Automatic
Mine has 300K+, runs at 40psi on the highway and sometimes 15-20psi at idle. Surprisingly, I have no ticking noise. I just don't stay still long enough for it to sit and idle much when it's warm :). Mine needs a rebuild. And cam bearings.

Getting on the gas seems to keep oil pressure level enough, like I said only at idle and in drive. Check engine light is coming on and off intermittently and that freaks me out.
 

Mattl12

New member
Joined
Jul 12, 2019
Messages
6
Reaction score
0
Points
1
Location
Louisiana
Vehicle Year
1990
Make / Model
Ranger 2WD
Transmission
Automatic
Oh yeah does an "Electrical Brown Out" mean anything to any of you as far as oil pressure readings? When I found a discussion that matches my problem almost exactly that came up, unfortunately there was not more to that?
 

Uncle Gump

Well-known member
Supporting Member
Joined
Sep 17, 2018
Messages
1,177
Reaction score
416
Points
83
Location
Plano IL
Vehicle Year
2006
Make / Model
Ford
Engine Size
4.0L
Transmission
Automatic
2WD / 4WD
4WD
My credo
Lead, Follow or get out of my way
Yes a mechanical gauge will screw in where the switch is located. Get a gauge in there and see what the readings are.

Paulos... 15 to 20 psi on a hot idle sounds pretty good to me actually...
 


Top