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Old 02-11-2010, 18:29   #1 (permalink)
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NO oil pressure

Hey folks, thanks for the help.
Patient is a 2000 GM with 190,000 mi. The car was a gift from my father. It has been pampered all it's life, and is in magnificent condition.
I drove it home last Sunday(4 hour trip). About 2hours into the drive, I noticed it had a lurching when going up an incline. Then the check engine light came on. The guages all read OK, and there was no smoke, etc. I drove the car home with the overdrive off, stopping a few times to check for leaks. Again, the guages all read fine when I got home.
Monday evening, I attempted to go to AutoZone to have the code read. The car started and ran fine, but when I noticed the oil pressure guage read like the key wasn't on, I pulled back into the garage.
Tonight, I had a friend look into the oil fill hole, and he couldn't see any evidence of oil flowing in the top end of the engine.
Does anyone have any ideas?
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Old 02-11-2010, 18:54   #2 (permalink)
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Re: NO oil pressure

They were known to have a bad connection at the sending unit. It's located near the oil filter. Unplug it and replug it. That should make it work but you should get a new sending unit. You didn't hear any engine knocking did you? These engines have been known to go as high as over 600,000 miles when serviced regularly.
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Old 02-11-2010, 23:05   #3 (permalink)
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Re: NO oil pressure

No oddball noises of any kind.
One of the reasons I like this car so much is that you can barely hear it run!
I'll let you know about the sending unit...
thanks
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Old 02-12-2010, 08:11   #4 (permalink)
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Re: NO oil pressure

Well, I unplugged the connector--no corrosion or dirt evident.
Plugged it back in--no change in the guage reading.
I'm going to put in a new pressure sensor.
Are oil pumps in this model engine prone to catrostrophic failure? I always thought an oil pump would fail slowly.
Thanks for all the help.
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Old 02-12-2010, 08:37   #5 (permalink)
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Re: NO oil pressure

Try removing the wire and turning the key on, the gauge should go all the way over, then back down when the wire is attached. This would eliminate a bad gauge and more than likely be a bad sending unit.

I doubt its the oil pump but might want to wait for rtg143 to verify this. In the meantime don't drive it.
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Old 02-12-2010, 09:07   #6 (permalink)
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Re: NO oil pressure

Ground the wire to the sending unit with the key on and see if the guage goes to high.
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Old 02-12-2010, 11:44   #7 (permalink)
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Re: NO oil pressure

Replaced the sending unit...all is well!!HURRAH!
Now, I just need to figure out which coil pack is bad.
Folks, thanks for all your help!!!
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Old 02-12-2010, 11:48   #8 (permalink)
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Re: NO oil pressure

If you have an Autozone nearby, they check the codes for free.
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Old 02-12-2010, 14:49   #9 (permalink)
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Re: NO oil pressure

They sure do. #7 cylinder misfire. Replaced the coil, and no worries.
The problem now is the mount for the sending unit/oil filter is leaking. I think I screwed it up overtightening the sender unit. Is it a problem to replace?
I doubt Autozone will have the part, so I'm probably in for a trip to the 'yard or the dealer.
Any Ideas?
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Old 02-12-2010, 15:32   #10 (permalink)
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Re: NO oil pressure

Are you sure the oil filter housing is bad? Look at it closely and maybe you can redo the job and fix it. If not, you can search for a part here. You can find out if they have a car like it to get the part from. Car-Part.com--Used Auto Parts Market
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