I have a 92 4.0L Wrangler, has had a oil pump replaced a few months ago. It has 140K miles. The problem is this.. Sometimes (can go a whole day of driving without this happening at times) The oil pressure will drop to 0. At this time a lifter gets real noisey and a rod rap can be heard if you rev it. It stays at zero until I shut the motor off and restart. Every time I resart it goes back up, even after 1 second of off/on cycle. I am losing oil pressure and it doesn't come back until I shut down and restart, strange. I have the oil pan off and oil pump out, all looks like new still.
As I said, It has gone a full day at 40psi no problem and then some days it can do this zero drop 2 times within 5 minutes.
Temperature, driving conditions angle, nothing seems to change its habits.
I am thinking maybe the oil pressure relief valve? Maybe the oil filter (new by the way) There must be something doing this!!??? Help please.
2006-12-02 12:31:57 · 7 answers · asked by Kenny P1974 1 in Cars & Transportation ➔ Maintenance & Repairs
The screen, pan, and pump have all been taken apart and look great, no crud. I took the pump apart and I see only a little wear. I did notice however dots on each of the gears, wondering what these are for.. balancing?
It has to be the relief valve?? There is nothing else there??
2006-12-02 13:17:29 · update #1
yes this sounds like a pressure relief valve problem,replace the pump again,they should supply one under warranty
if the oil filter goes into bypass it still maintains pressure,just skips filtering
2006-12-02 12:38:07 · answer #1 · answered by Marilyn L 1 · 0⤊ 0⤋
if it has 40 psi normally then the engine is still good at this time, i would check the pressure relief valve for sure, also check the oil pump drive for wear and tear and make sure there isnt a baffle in the oil pan coming loose....an oil filter could cause the problem as well but if you have changed it and the problem is still there that should rule it out unless you used the exact same filter.... hope this helps
2006-12-02 12:38:48 · answer #2 · answered by Christian 7 · 0⤊ 0⤋
Try to see if there isnt a short in the electrical connection to the pump. My 95 cherokee appears to be losing oil pressure a lot but i have determined that its the sending unit thats bad not the oil pump
2006-12-02 13:05:59 · answer #3 · answered by mikejones33333 2 · 0⤊ 0⤋
Did you clean or better yet, replace the screen on the oil pickup? It sounds like you are getting blockage when it's running at highway speed and causing a lot of suction. Shutting it down would allow the 'crud' to shift so it would flow again. Take off and replace the screen on the pickup, and I would bet you the problem will stop.
2006-12-02 12:38:31 · answer #4 · answered by oklatom 7 · 0⤊ 0⤋
I would have the new pump checked and the filter. I've had "new" parts be bad. Could also be electrical.
2006-12-02 12:52:48 · answer #5 · answered by Joe 1 · 0⤊ 0⤋
sounds like the oil pump pickup screen is plugged. probably from excessive rtv sealent. fix it or replace engine.
2006-12-02 12:44:12 · answer #6 · answered by krazymecha 3 · 0⤊ 0⤋
All i know is i`m getting 2 points for this
2006-12-06 11:01:03 · answer #7 · answered by Anonymous · 0⤊ 0⤋