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Oil Pressure Light on E30 S52

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    Oil Pressure Light on E30 S52

    Hey everyone;

    I've got an OBD1 S52 going into my E30, to replace the aged M50 in there now.

    It was started up last week (with Rotella T6 in it) and it has two problems:

    1. Oil pressure light is on.
    2. Valves are ticking a lot.

    The engine was completely rebuilt before it went into the car. New everything, including oil pump.

    My initial thoughts are:

    1. We reused the M50 harness on the S52, so it's OBD1. Are there any things that need to be done with the oil pressure in the harness or sensors to accommodate?

    2. Could the oil non return valve cause problems like this?

    3. Would the oil pressure sensor cause problems like this?

    Any assistance would be appreciated.
    Last edited by MaxBell; 03-18-2017, 03:58 PM.
    REMEMBER: Be safe and have fun is Rule Number 1.

    The Epic Unbuild of Clint Eastwood

    #2
    do you have an aftermarket pressure gauge you could try? I would want to know exactly what my oil pressure was to help verify if it is just a bad sensor or if it really isn't getting oil for some reason.

    Comment


      #3
      if the valves are ticking that a pretty good indication you have low oil pressure. I believe the sensors are different between 1 and 2 (could be wrong) but that still wont have any effect of the ticking unless the lifters are just dry and have not built up pressure yet. If you only ran it for a second then shut it off get a oil pressure gauge and read what the actual pressure is. If you ran it for awhile and it didn't go away you probably have an issue with pressure

      Comment


        #4
        I had my engine rebuilt before my swap and def made sure I ran an oil pressure gauge from the beginning just to know if something was put together wrong.

        Comment


          #5
          Sensors are same and wiring is same. Sounds like its doing its job

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          Comment


            #6
            were the oil squirters removed but not replaced?
            '87 325ic, powered by S50.

            Comment


              #7
              Did you check and secure the oil pump nut?

              Comment


                #8
                Originally posted by haaken675 View Post
                do you have an aftermarket pressure gauge you could try? I would want to know exactly what my oil pressure was to help verify if it is just a bad sensor or if it really isn't getting oil for some reason.
                I'll go pick one up and check the actual pressure, then will report back.

                Originally posted by Shftr8 View Post
                if the valves are ticking that a pretty good indication you have low oil pressure. I believe the sensors are different between 1 and 2 (could be wrong) but that still wont have any effect of the ticking unless the lifters are just dry and have not built up pressure yet. If you only ran it for a second then shut it off get a oil pressure gauge and read what the actual pressure is. If you ran it for awhile and it didn't go away you probably have an issue with pressure
                The car was driven around for a few minutes. How long do you think it would take to build oil pressure on a brand new rebuild?

                Originally posted by 328ijunkie View Post
                Sensors are same and wiring is same. Sounds like its doing its job
                Ok, awesome.

                Originally posted by e30rapidic View Post
                were the oil squirters removed but not replaced?
                The oil squirters are under the crank bearings right? I had a race shop do the bottom end, so that should be fine.

                Originally posted by exhaust View Post
                Did you check and secure the oil pump nut?
                Yep, that's lock-tite'ed on.
                REMEMBER: Be safe and have fun is Rule Number 1.

                The Epic Unbuild of Clint Eastwood

                Comment


                  #9
                  Originally posted by MaxBell View Post
                  I'll go pick one up and check the actual pressure, then will report back.



                  The car was driven around for a few minutes. How long do you think it would take to build oil pressure on a brand new rebuild?



                  Ok, awesome.



                  The oil squirters are under the crank bearings right? I had a race shop do the bottom end, so that should be fine.



                  Yep, that's lock-tite'ed on.
                  It does not take a few minutes to build oil pressure.
                  2006 GMC Sierra 2500HD 4WD LBZ/Allison
                  2002 BMW M3 Alpinweiß/Black
                  1999 323i GTS2 Alpinweiß
                  1995 M3 Dakargelb/Black
                  - S50B32/S6S420G/3.91
                  1990 325is Brilliantrot/Tan
                  1989 M3 Alpinweiß/Black

                  Hers: 1996 Porsche 911 Turbo Black/Black
                  Hers: 1988 325iX Coupe Diamantschwartz/Black 5spd

                  sigpic

                  Comment


                    #10
                    Should build enough pressure from cranking, If I pull the fuel pump relay and turn the engine over, it takes maybe 5s for the light to go out after the car has been sitting all winter.
                    Originally posted by priapism
                    My girl don't know shit, but she bakes a mean cupcake.
                    Originally posted by shameson
                    Usually it's best not to know how much money you have into your e30

                    Comment


                      #11
                      My fresh S50 swap is doing the same thing.

                      Check Engine Oil light comes On - I thought it was normal with the swaps but I'm glad you mentions something
                      Valves ticking. - I thought it was the injectors apparently nope. It's the valves.


                      I'm going with thicker oil here soon. - appointment on Monday maybe 10-30 Liqui MOly unless anybody have any other suggestion on the weight?
                      Follow my IG @bouchezphotography

                      Comment


                        #12
                        Well, there are two oil lights. There's the oil pressure on the cluster, and oil level on the check panel.

                        If your cluster light is on, that's a problem. That needs to be fixed.

                        If the check panel light is on, it has nothing to do with the weight. That means that the sensor isn't working correctly.
                        2006 GMC Sierra 2500HD 4WD LBZ/Allison
                        2002 BMW M3 Alpinweiß/Black
                        1999 323i GTS2 Alpinweiß
                        1995 M3 Dakargelb/Black
                        - S50B32/S6S420G/3.91
                        1990 325is Brilliantrot/Tan
                        1989 M3 Alpinweiß/Black

                        Hers: 1996 Porsche 911 Turbo Black/Black
                        Hers: 1988 325iX Coupe Diamantschwartz/Black 5spd

                        sigpic

                        Comment


                          #13
                          The one that is on at the moment is the "Check Panel"

                          regarding the oil weight any opinions?
                          Follow my IG @bouchezphotography

                          Comment


                            #14
                            Originally posted by cbouchez View Post
                            The one that is on at the moment is the "Check Panel"

                            regarding the oil weight any opinions?
                            I usually run a 0w40 or 5w40.
                            2006 GMC Sierra 2500HD 4WD LBZ/Allison
                            2002 BMW M3 Alpinweiß/Black
                            1999 323i GTS2 Alpinweiß
                            1995 M3 Dakargelb/Black
                            - S50B32/S6S420G/3.91
                            1990 325is Brilliantrot/Tan
                            1989 M3 Alpinweiß/Black

                            Hers: 1996 Porsche 911 Turbo Black/Black
                            Hers: 1988 325iX Coupe Diamantschwartz/Black 5spd

                            sigpic

                            Comment


                              #15
                              Originally posted by cbouchez View Post

                              I'm going with thicker oil here soon. - appointment on Monday maybe 10-30 Liqui MOly unless anybody have any other suggestion on the weight?
                              10w30 thicker? Does that mean you're running 0w20 now?

                              Shouldn't be running anything thinner than a *w40 on a 24v
                              Originally posted by priapism
                              My girl don't know shit, but she bakes a mean cupcake.
                              Originally posted by shameson
                              Usually it's best not to know how much money you have into your e30

                              Comment

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