ok so wtf..?

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  • e30loverSC
    E30 Addict
    • Jun 2009
    • 575

    #1

    ok so wtf..?

    Ok, im still workin on this idle problem... It runs really good on the highway and doesnt skip a beat. But at low rpms if you rev it a little seems a little hesitant. AND IDLE IS ROUGH. Is at a constant rpm but my car is shakin and if you listen to the exhaust you can hear a skip or misfire. New plug wires and coil.. And intake manifold gasket.. and other hoses. No Check engine light. Im kinda stuck here idk wtf is causing this. I plan to have it smoke tested after xmas. But i just rebuilt the head and put it back on.. There was a tube that ran from inake manifold to the block as well that looked like it may have had a bad o ring and it had some kind of spring. I have no idea what that tube is or anything. Any suggestions?
  • PReta
    E30 Enthusiast
    • Sep 2008
    • 1091

    #2
    mine is doing the same thing. but i think its because my distributor cap and wires cracked from a previous accident i was in.
    -Paolo
    1986 325e RIP.
    1989 525i
    1986 635CSI

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    • e30loverSC
      E30 Addict
      • Jun 2009
      • 575

      #3
      Well i know mine is not cracked. But idk how old it is either.. this sucks balls . Especially on a cold start its worse

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      • BlUe E30
        Advanced Member
        • Jun 2008
        • 180

        #4
        man sounds like you have a vacuum leak if its only at idle... check all the hoses i just fixed my buddies that was doing the SAME thing. im going to say that im almost sure its a vacuum leak. that tube is bmws way of a pcv system because there is no pcv valve. if you have ever heard of using propane and a fitting while your car is at idle and move it around your engine bay when ever the idle picks up walla there is your vacuum leak!
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        • e30loverSC
          E30 Addict
          • Jun 2009
          • 575

          #5
          nice i figured a vacuum leak... but seriously I have NO idea from where i have been searching... There must be somewhere im missing

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          • BlUe E30
            Advanced Member
            • Jun 2008
            • 180

            #6
            ok well can you hear any audible hissing sound from anywhere listen real carefully when its idling. and check the hoses under the throttle body thats a common over looked place there should be either 3 or 4 hoses going up into the bottom of it. use a flashlight because one is kinda hard to see
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            • e30loverSC
              E30 Addict
              • Jun 2009
              • 575

              #7
              i just replaced those with new silicone hoes.. haha maybe a brake line?

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              • BlUe E30
                Advanced Member
                • Jun 2008
                • 180

                #8
                could be off the master cylinder, do you hear any hissing? and is that tube on the side of the block back in all the way? make sure your valve cover is torqued down
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                • e30loverSC
                  E30 Addict
                  • Jun 2009
                  • 575

                  #9
                  ok ill go check. Do you have texting ? Ill go to the garage real quicl and take a wuick look

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                  • BlUe E30
                    Advanced Member
                    • Jun 2008
                    • 180

                    #10
                    yes i do
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                    • e30loverSC
                      E30 Addict
                      • Jun 2009
                      • 575

                      #11
                      ok whats your number bro. I go to orlando a lot i go visit family im from Fl. When i get out of college i hope to move back

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                      • e30loverSC
                        E30 Addict
                        • Jun 2009
                        • 575

                        #12
                        Man no luck... i have no idea.. Its not as bad when its warmed up either. I Went down and messed with it for a while and no luck.. Do you think it could be cap or rotor? But if its going to the shop to get some bushins replaced that i cant do at the house.. so ill have him run the smoke test.. if i cant do anything!

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                        • BlUe E30
                          Advanced Member
                          • Jun 2008
                          • 180

                          #13
                          do you have carb cleaner or propane or anyhting like that? that could help find it if not i would say next best thing is smoke test
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                          • e30loverSC
                            E30 Addict
                            • Jun 2009
                            • 575

                            #14
                            out of carb cleaner.. and propane... near hot engine? idk Plus i dont think i have a real portable amount anywhere around. =/ this sucks balls.. im really hoping its a vacuum leak. Its runs great when driving...

                            Comment

                            • BlUe E30
                              Advanced Member
                              • Jun 2008
                              • 180

                              #15
                              thats the sole symptoms of a vacuum leak. and yes propane. you get like the little coleman bottles, believe it or not you can buy this fitting on a parts truck. but you get a nozzle and like a hose that you would put to put air in a fish tank and bleed the propane a little bit. when the rough idle goes away and smooths out there is where the vacuum leak is. i would say look in the morning or get a second set of eyes to see if somethng is out of place maybe somethnig your missing
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