rough idle after valve adjustment?

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  • naika
    E30 Addict
    • Jul 2007
    • 466

    #1

    rough idle after valve adjustment?

    I just adjusted my valves and the Idle slightly lower than what it use to be and I feel like the car is slightly shaking at the light. I set them to the Bentley specs.
    Also, not sure if that would be related but I had the impression today that the engine was running hotter than usual (weather wasn't hot and I did a few mile trip to the food store, temp was about half way the gauge)

    Anybody can help?
    Thanks guys
    344is! Obd1 conversion

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  • Brew
    No R3VLimiter
    • Oct 2003
    • 3060

    #2
    Sounds like you adjusted the valves too tight.
    '91 318is
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    • Joe318is
      R3V OG
      • Sep 2005
      • 6451

      #3
      or you didnt put everything back together properly and now have a vacuum leak... idle that is


      Originally posted by vlad
      Do you know anybody else who built that many bad ass E30s?

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      • naika
        E30 Addict
        • Jul 2007
        • 466

        #4
        I put a new gasket and I don't think I have a leak.
        Is it going to blow the engine if I drive it like that tomorrow?
        344is! Obd1 conversion

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        • vivalegreg
          E30 Fanatic
          • Apr 2006
          • 1313

          #5
          no guarentee...but if you did them to spec (.008 engine ice cold as in hasnt been run in the morning) and did them slightly tight...you should be ok..

          i "did my valves" first time to .010 when warm....then .008 cold and i think the 2nd time i did it too tight... but i still drove my car each time...and still drive the shit out of it...

          i had an ix..that had valves the needed adjustment...and i drove the shit out of it one day...slammed into 4th...and then broke a rocker. my advice to you...dont drive the shit out of your car...and you should be ok...then when you have time...adjust your valves again right. when you tighten up the eccentric...the .008 feeler gauge should feel "snug" but not tight...it should be tight enough to kinda grab the gauge but not tight to the point where it kinda takes an effort to pull it out

          hope this helps...
          e30s r kool

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          • dredgfan
            R3VLimited
            • Aug 2007
            • 2636

            #6
            The guys at my shop said that they adjust them a little looser than stock and it makes it idle smoother

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            • MR 325
              Moderator
              • Oct 2003
              • 37825

              #7
              Originally posted by dredgfan
              The guys at my shop said that they adjust them a little looser than stock and it makes it idle smoother
              There are specs for a reason.
              BimmerHeads
              Classic BMW Specialists
              Santa Clarita, CA

              www.BimmerHeads.com

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              • naika
                E30 Addict
                • Jul 2007
                • 466

                #8
                Thanks Guys, I think I set them a bit too tight. Might have to take care of that tonight then
                344is! Obd1 conversion

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                • naika
                  E30 Addict
                  • Jul 2007
                  • 466

                  #9
                  Just re adjusted the valves to 0.12 on the engine hot (that's what Bentley recommends) and it seems to have fixed the problem
                  344is! Obd1 conversion

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                  • nando
                    Moderator
                    • Nov 2003
                    • 34827

                    #10
                    Originally posted by vivalegreg
                    no guarentee...but if you did them to spec (.008 engine ice cold as in hasnt been run in the morning) and did them slightly tight...you should be ok..

                    i "did my valves" first time to .010 when warm....then .008 cold and i think the 2nd time i did it too tight... but i still drove my car each time...and still drive the shit out of it...
                    it's supposed to be .010 cold, not .080 cold. that's way too tight.
                    Build thread

                    Bimmerlabs

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                    • naika
                      E30 Addict
                      • Jul 2007
                      • 466

                      #11
                      Originally posted by nando
                      it's supposed to be .010 cold, not .080 cold. that's way too tight.
                      Yes, it is 0.10 cold and 0.12 warm
                      I did mine 0.10 with engine slightly warm and it was too tight, had to redo it
                      344is! Obd1 conversion

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                      • 10/10ths
                        Grease Monkey
                        • May 2007
                        • 306

                        #12
                        Originally posted by naika
                        Yes, it is 0.10 cold and 0.12 warm
                        I did mine 0.10 with engine slightly warm and it was too tight, had to redo it

                        Was it smoother after you re-did them?
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                        • naika
                          E30 Addict
                          • Jul 2007
                          • 466

                          #13
                          Originally posted by 10/10ths
                          Was it smoother after you re-did them?
                          yes, car runs perfect now. I can so tell the difference.
                          I really wanted to do them at 0.1 with an ice cold engine but my car is my DD and I would have to do this on a weekend in the morning. Couldn't take a chance to drive all week.
                          344is! Obd1 conversion

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