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This is a re-post with additional clairfication as I now have a gauge I can trust.
This is the updated skinny:
Indicator light kept coming on after about a mile of travel.
Checked for frayed or short none found.
Replaced Oil presure sensor -- same problem.
Replaced light with presure gage and upon starting had 40+ psi
Drove a mile or so - presure droped to 0
Stoped car and immiadetly restarted and presure jumped up to 40+ again. I let it idle and pressure droped to 26 after a few minutes and stayed there. Kicked it up to 2000 rpm and pressure jumps to 35 or so. Start out go a mile and drops to Zero. Stop car restart and am back up to 40+. As long as I stop the car and restart after it drops to 0 it comes right back up. That would work well if I only needed to take less than 1 mile trips or wanted to stop 20 times on a 20 mile trip.
I am willing to replace the oil pump but it defies all logic that it is bad at least all my logic. Where does the presure go? How does it come back so reliabely?
Thanks to a reply from Rolyak, he may have pointed me in the right direction and anyone that can share any more details regarding his post or any other insight will be greatly appreicated.
Rolyak wrote:
Did a little research on Alldata, appears the relief valve may be accessable externally. The B234 pump is unlike the B230 and is not driven via a "jackshaft" but is located directly behind the front timing cover with the regulator in the block. The Alldata picture is not that good but I would look at the LF corner(drivers side) of the block and (I'm guessing here) about 2/3's of the way down. You may be able to pull it, clean it,possibly replace the spring and solve the problem?
I have my doubts that the drive pulley could be slipping on the shaft as they mention a locating champfer.
89 740 gl wagon
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