Low Oil Pressure - Replaced O ring, sending unit (no screen) and oil pump
#1
Low Oil Pressure - Replaced O ring, sending unit (no screen) and oil pump
2004 H2 -220k
oil pressures has always been at 40psi
now about 10 on start and after a few miles down to 5. Higher rpms will increases to about 10 but then fall to almost 0 at idle. Only other symptom a very faint clicking and stutter or hesitation at idle. She runs fine up and down the Colorado passes - still has plenty of power.
Oil pressure reads within specs manually.
Trying to solve this - replaced O Ring, Replaced Sending Unit (no screen), replaced oil pump, replaced timing chain since I was there. No change in symptoms.
cleaned fuel injectors (2 had bad spray pattern), replaced nasty knok (spelling) sensor, new spark plus & wires. I had the shop check lifters - 2 different shops say they are fine. Of course I have changed the oil several times - no visible gunk or shiny stuff at the end of the drain.
so lots of work and I still have same symptoms. There is definitely something wrong - you can tell at idle. Throws no codes.
Any ideas on what I should try next?
oil pressures has always been at 40psi
now about 10 on start and after a few miles down to 5. Higher rpms will increases to about 10 but then fall to almost 0 at idle. Only other symptom a very faint clicking and stutter or hesitation at idle. She runs fine up and down the Colorado passes - still has plenty of power.
Oil pressure reads within specs manually.
Trying to solve this - replaced O Ring, Replaced Sending Unit (no screen), replaced oil pump, replaced timing chain since I was there. No change in symptoms.
cleaned fuel injectors (2 had bad spray pattern), replaced nasty knok (spelling) sensor, new spark plus & wires. I had the shop check lifters - 2 different shops say they are fine. Of course I have changed the oil several times - no visible gunk or shiny stuff at the end of the drain.
so lots of work and I still have same symptoms. There is definitely something wrong - you can tell at idle. Throws no codes.
Any ideas on what I should try next?
#5
Could be a cam bearing walked. When I pulled the cam on the lq4 I installed in my gbody, cam bearing #2 fell out. The cam wasn't damaged and neither was the block bore. I put new bearings in and was good to go.
Last edited by fastNYsix; 05-05-2022 at 03:03 PM.
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