I have had the truck for a year, and have learned a lot from this forum. I am stumped on my current issue.
99 LX470
Starting a few days ago, when starting the truck, the oil pressure gauge goes straight to mid-range, then steadily climbs until it is pegged on high.
I changed the sending unit, same issue. I put the old one back on.
I hooked up a mechanical gauge, it was at 80 psi idling.
Thought that my filter was clogged, so I changed the oil and filter. Only a few thousand miles since a change, but stranger things have happened.
After the oil and filter, pressure went up to 70 psi, then dropped to about 40 psi at idle after it warmed up. I thought I had fixed it.
Put the old sending unit on and plugged everything up.
Same issue. Pegging on high.
Drove it around, stopped at the car wash. When leaving, it acted right. I thought it had to relearn something after being unplugged.
After pulling away, when RPM went up a little, the gauge started climbing and never went back down.
Now, every 3-5 times I switch it off and start it back up, the gauge acts correctly at idle.
When I give it a little throttle and the gauge climbs, it climbs until it pegs on high.
I don't think Techstream gives an oil pressure reading, but I'll plug it in and verify.
I don't think I have a real oil pressue issue because the mechanical gauge gave good readings, and it acts right some of the time.
I think the sending unit is okay. The old one looks new, and I had the same issue when I replaced it, although I didn't leave the new one on very long.
I feel like it must be the gauge.
Has anyone seen this before, or have any ideas on how to troubleshoot?
Thanks in advance for the help.
99 LX470
Starting a few days ago, when starting the truck, the oil pressure gauge goes straight to mid-range, then steadily climbs until it is pegged on high.
I changed the sending unit, same issue. I put the old one back on.
I hooked up a mechanical gauge, it was at 80 psi idling.
Thought that my filter was clogged, so I changed the oil and filter. Only a few thousand miles since a change, but stranger things have happened.
After the oil and filter, pressure went up to 70 psi, then dropped to about 40 psi at idle after it warmed up. I thought I had fixed it.
Put the old sending unit on and plugged everything up.
Same issue. Pegging on high.
Drove it around, stopped at the car wash. When leaving, it acted right. I thought it had to relearn something after being unplugged.
After pulling away, when RPM went up a little, the gauge started climbing and never went back down.
Now, every 3-5 times I switch it off and start it back up, the gauge acts correctly at idle.
When I give it a little throttle and the gauge climbs, it climbs until it pegs on high.
I don't think Techstream gives an oil pressure reading, but I'll plug it in and verify.
I don't think I have a real oil pressue issue because the mechanical gauge gave good readings, and it acts right some of the time.
I think the sending unit is okay. The old one looks new, and I had the same issue when I replaced it, although I didn't leave the new one on very long.
I feel like it must be the gauge.
Has anyone seen this before, or have any ideas on how to troubleshoot?
Thanks in advance for the help.