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E30 finally almost runs right!

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    #1

    E30 finally almost runs right!

    I have an 88 325i rebuilt from the head up with new gaskets new relays and new fuel.filter and fuel pump plus alot more upgrades. The car is throwing a check engine light but it won't throw me a code. When the car idles right it throws a check engine light but sometimes it'll idle up to 1200 and there wont be a check engine light. There is no vaccuum leaks. When I go outside in the morning it is hard to start up sometimes, but once o get it started it runs fine until it sits for a while and then its hard to start again. If you have any knowledge on what is goin on with my car, I ask that you will please tell me. Thanks.
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    #2
    Check the idle switch. Check for continuity between pins 2 and 18 under the throttle body

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      #3
      The stomp test not working strongly suggests a bad or mis-adjusted TPS. The idle problems could be that, or a sticky ICV, or intake leaks. You say there aren't any, but unless you have hd a smoke test run you can't make that assertion.
      The car makes it possible, but the driver makes it happen.
      Jim Levie, Huntsville, AL

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        #4
        Originally posted by jlevie View Post
        The stomp test not working strongly suggests a bad or mis-adjusted TPS. The idle problems could be that, or a sticky ICV, or intake leaks. You say there aren't any, but unless you have hd a smoke test run you can't make that assertion.
        I had one ran. And now its throwing the code for coolant temp sensor. I've already replaced it though..

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          #5
          A 1223 code can the caused by a bad sensor, a fault in the wiring harness, or a bad DME.
          The car makes it possible, but the driver makes it happen.
          Jim Levie, Huntsville, AL

          Comment

            #6
            Originally posted by jlevie View Post
            A 1223 code can the caused by a bad sensor, a fault in the wiring harness, or a bad DME.
            How do you know if any of its bad? I put a 173 ecu in my car.

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              #7
              Sometimes the check engine light will go off if I hit a bump in the road too?

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                #8
                The first thing I'd do would be to disconnect the DME and check the resistance of the ECT circuit from the DME connector and then compare that to the resistance as measured at the ECT. If those are different there is a problem in the harness.
                The car makes it possible, but the driver makes it happen.
                Jim Levie, Huntsville, AL

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                  #9
                  Originally posted by jlevie View Post
                  The first thing I'd do would be to disconnect the DME and check the resistance of the ECT circuit from the DME connector and then compare that to the resistance as measured at the ECT. If those are different there is a problem in the harness.
                  Im not sure how to do that....

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                    #10
                    Using the wiring diagrams for you car from http://wedophones.com/BMWManualsLead.htm and a DMM you can do the test I suggested.
                    The car makes it possible, but the driver makes it happen.
                    Jim Levie, Huntsville, AL

                    Comment

                      #11
                      Originally posted by jlevie View Post
                      Using the wiring diagrams for you car from http://wedophones.com/BMWManualsLead.htm and a DMM you can do the test I suggested.
                      Is this a hard taskk?....

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                        #12
                        No, not hard at all. I would rather do this than an oil change.

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