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325i doesn't give a decent spark on cyl. 6

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    325i doesn't give a decent spark on cyl. 6

    It has a spark, but not a good one.

    We've changed the plugs, the plug leads, the distributor cap and the rotor, but it still wont work properly.

    Any ideas?



    '91 E30 316i
    '97 Rover Mini 1275

    #2
    low compression? how bout the ignition coil?

    if you have an ohmmeter, check the resistance of the ignition coil. it should be .50 ohms. if you have higher resistance than .50 ohms, replace it.

    (straight out of the bentley manual :p )
    -Brad, AlphaTeam Motorwerks, LLC
    91' 318iS - S54/6MT Swapped
    08' E90 M3 6MT - Daily
    04' Chevy Duramax CCLB - Work Truck/Hauler


    Originally posted by IronJoe
    Alpha Team: running through e30s, gringo icebergs, and 19 yr olds.

    Originally posted by 2mAn
    Brads a standup guy even though he likes buttsex

    Comment


      #3
      Going to do a compression test tomorrow, and change the coil.
      But if it was the coil, how would only one of the six cylinders be affected?
      It doesn't make sense to me.
      '91 E30 316i
      '97 Rover Mini 1275

      Comment


        #4
        Originally posted by EndreM View Post
        Going to do a compression test tomorrow, and change the coil.
        But if it was the coil, how would only one of the six cylinders be affected?
        It doesn't make sense to me.

        true, just throwing it out there. id say compression test her, and see what happens. GL!
        -Brad, AlphaTeam Motorwerks, LLC
        91' 318iS - S54/6MT Swapped
        08' E90 M3 6MT - Daily
        04' Chevy Duramax CCLB - Work Truck/Hauler


        Originally posted by IronJoe
        Alpha Team: running through e30s, gringo icebergs, and 19 yr olds.

        Originally posted by 2mAn
        Brads a standup guy even though he likes buttsex

        Comment


          #5
          Will do, thanks! :D

          The thing is, that we took the sparkplugs out and widened the gap, and on the other five cylinders it was okay, but the spark couldn't jump the extra gap on number six.

          Excuse my bad english..
          '91 E30 316i
          '97 Rover Mini 1275

          Comment


            #6
            weird...i would think it was the leads, or the cap and rotor. but since those were changed, i dont know!?
            -Brad, AlphaTeam Motorwerks, LLC
            91' 318iS - S54/6MT Swapped
            08' E90 M3 6MT - Daily
            04' Chevy Duramax CCLB - Work Truck/Hauler


            Originally posted by IronJoe
            Alpha Team: running through e30s, gringo icebergs, and 19 yr olds.

            Originally posted by 2mAn
            Brads a standup guy even though he likes buttsex

            Comment


              #7
              I have seen multiple posts like this and they all lead back to one thing. ECU. They have a tendency to fail after 20+ years. This could definitely be your problem.


              Taylor
              Need a performance chip for you BMW? Shoot me a PM and I'll get you taken care of!!
              Taylor- Follow me on Instagram @e30_fiend


              Comment


                #8
                Thanks, I didn't know what to search for.

                I'll see if I can find a similar ECU somewhere and try.
                We actually thought about it, but figured that if the ECU was broken, none of the sparks would ignite properly.
                '91 E30 316i
                '97 Rover Mini 1275

                Comment


                  #9
                  I would think the same thing in your situation. BUT, youve replaced basically every part of your ignition system. Only other thing I could think of other than the ecu is possibly the injector main connector. A bad injectors can cause a misfire just like a spark plug. But that still wouldn't explain the weak spark on #6.


                  Taylor
                  Need a performance chip for you BMW? Shoot me a PM and I'll get you taken care of!!
                  Taylor- Follow me on Instagram @e30_fiend


                  Comment


                    #10
                    When you changed the distribution, rotor, and ignition wires did you use new parts. And if so did you use Bosch wires? What did you set the plug gaps to?

                    This isn't likely to be a problem with the DME or coil. Either of those should affect all cylinders equally.
                    The car makes it possible, but the driver makes it happen.
                    Jim Levie, Huntsville, AL

                    Comment


                      #11
                      Originally posted by E30_fiend View Post
                      I would think the same thing in your situation. BUT, youve replaced basically every part of your ignition system. Only other thing I could think of other than the ecu is possibly the injector main connector. A bad injectors can cause a misfire just like a spark plug. But that still wouldn't explain the weak spark on #6.


                      Taylor
                      Yeah. The car has a lot of water leaks aswell, but the ECU seemed dry.
                      We'll try another ECU and check.


                      Originally posted by jlevie View Post
                      When you changed the distribution, rotor, and ignition wires did you use new parts. And if so did you use Bosch wires? What did you set the plug gaps to?

                      This isn't likely to be a problem with the DME or coil. Either of those should affect all cylinders equally.
                      Brand new OEM parts. I must say, this isn't my car, it's my friend's. I don't know what the gap is, but it's the same on all six.

                      I'm actually running his old ignition parts minus the plugs on my car, and it's fine.
                      '91 E30 316i
                      '97 Rover Mini 1275

                      Comment


                        #12
                        Originally posted by EndreM View Post
                        Brand new OEM parts. I must say, this isn't my car, it's my friend's. I don't know what the gap is, but it's the same on all six.

                        I'm actually running his old ignition parts minus the plugs on my car, and it's fine.
                        Okay, then pull the plugs and make sure they are set for the correct gap.
                        The car makes it possible, but the driver makes it happen.
                        Jim Levie, Huntsville, AL

                        Comment

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