What is this problem.... (video provided)

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  • E30_Narek
    Grease Monkey
    • Sep 2014
    • 398
    #1

    What is this problem.... (video provided)

    The car has a really bad idle on startups (whether hot or cold) and randomly does this at times.

    https://youtu.be/dNkvAKjn5EY


    I've changed spark plugs, distributor cap + rotor, ignition coil, fuel pump, fuel filter (twice), oil filter, oxygen sensor and tried on two different AFMs and the car has absolutely no vacuum leaks. You could tell how bad the car is shaking from the camera shake. On top of all this, my car gets an average of 8 miles to the gallon.
    Tags: None
    • Kershaw
      R3V OG
      • Feb 2010
      • 11822
      #2


      Get one of these. Voltage tester. Hold it to the ignition coil wire going to the distributor. Check if the pulse is regular and rhythmic, or if the pulse is all over the place consistent with the crappy idle.

      That way you know if the problem is fuel side or ignition side. Maybe your injectors are bad.
      AWD > RWD

        Comment

        • staysideways
          Grease Monkey
          • Dec 2013
          • 373
          #3
          Originally posted by E30_Narek
          The car has a really bad idle on startups (whether hot or cold) and randomly does this at times.



          https://youtu.be/dNkvAKjn5EY




          I've changed spark plugs, distributor cap + rotor, ignition coil, fuel pump, fuel filter (twice), oil filter, oxygen sensor and tried on two different AFMs and the car has absolutely no vacuum leaks. You could tell how bad the car is shaking from the camera shake. On top of all this, my car gets an average of 8 miles to the gallon.


          Air cleaner

            Comment

            • estoguy
              E30 Enthusiast
              • May 2013
              • 1087
              #4
              Something else to try as well is to check your plug gap. Adjusting the gap to the wider end of the spec will also make the idle more stable.
              Estoguy
              1986 BMW 325, Alpenweiss ~ "Elsa"

              Need a photographer, come visit my site: http://estoguy.wix.com/unique-perspectives

                Comment

                • ahlem
                  Grease Monkey
                  • Sep 2008
                  • 369
                  #5
                  Check your fuel pressure and if low, try pinching off your return fuel line partially to see if your fuel pressure regulator is on the way out. Also try cleaning your idle air control valve. Your air/fuel ratio may be out of whack somewhere. Is the breather hose coming off your valve cover correctly attached? You might have some sort of odd crank case ventilation leak.

                    Comment

                    • E30_Narek
                      Grease Monkey
                      • Sep 2014
                      • 398
                      #6
                      Originally posted by staysideways
                      Air cleaner
                      Originally posted by estoguy
                      Something else to try as well is to check your plug gap. Adjusting the gap to the wider end of the spec will also make the idle more stable.
                      Originally posted by ahlem
                      Check your fuel pressure and if low, try pinching off your return fuel line partially to see if your fuel pressure regulator is on the way out. Also try cleaning your idle air control valve. Your air/fuel ratio may be out of whack somewhere. Is the breather hose coming off your valve cover correctly attached? You might have some sort of odd crank case ventilation leak.
                      Thanks for all the help guys but this was a couple of months ago haha. It ended up just being a bad TPS.

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