linebacker50

when i start it cold the oil pressure is 40 or so. but when the car is driven a while ( around 30 min ) i notice that at a stop light the pressure is down to somewhere in the nieghborhood of 25 and will literally bounce back and fourth. when i go to accelerate it will increae but only to like 32-34 or so. i changed to oil from 5w-30 to 10w-30. cars got 127 on the clock. the car has never had this problem before and im curious to what would be causing this.

conan

iTrader: (5)

Might want to try changing the oil pressure sending unit.

linebacker50

one thing i forgot to mention is that after i changed the oil it didnt do it for 2 weeks or so then it started again.

slayerized6

iTrader: (12)

OPSU (oil pressure sending unit)

i had the same problem last month and a new OPSU fixed it right up. check out WS6STORE, for the cheapest, and quicking shippest sponsor selling opsu's

camarolover209

yea mine was the sending unit on my V6 havent had a problem with my V8 camaro oil pressure sending unit

ArkBird96

my car may be doing the same thing. Don't you have to take the intake manifold off to replace it? ARGH!

linebacker50

can i just go ahead and get a after market oil pressure gauge or will the sending unit screw that up too?

blackz28x07

Just get a new OPS, mine was the exact same thing, now when my car is hot it never goes below 35 psi, and is at 55 on the highway.

linebacker50

where can i find a new OPSU? i checked the ws6 store and couldnt find one. also how hard are they to replace?

slayerized6

iTrader: (12)

98 OPSU
http://www.ws6project.com/user_stor/...oducts_id=2193

99-02 OPSU
http://www.ws6project.com/user_stor/...oducts_id=2071

LS6427

iTrader: (2)

You have to take the damn intake off.

I was putting my OPSU back on a little while ago with the OPSU "special" socket....and the sumbitch broke. Its so easy to break the bastard.

You have to really concentrate on keeping the socket perfectly straight up and down. Any tilt and you'll snap the black part off the metal nut.

What another **** design by the morons at GM.........

It might be possible to change it with the intake on, maybe. But that would make it all that much harder to get the new one back on without breaking it.

.

linebacker50

i might just go ahead and get a aftermarket oil pressure gauge and call it good.

Q8-TECH

you should use a oil pressure gauge to check the pressure and not the sending unit.
if you are using an oil pressure gauge and have low pressure and high miles it could be a worn pump or more commonly excesive clearance due to bearing wear