How the check to see if injectors are spraying normally?

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  • Dominick
    Grease Monkey
    • Aug 2004
    • 323
    #1

    How the check to see if injectors are spraying normally?

    my car has a shaky idle, rpms are stable, just the engine shakes the car at idle. i replaced motor mounts but it didnt help that well.

    so now i think one or more of my cylinders arent firing like they should. i have a 85 318i. the car drives pretty well, execpt for this tiny problem.

    do the code scanners detect a cylinder that isnt firing right?

    why do i think its an injector? me and my friend bought a diesel f250 and it would shake like crazy on the test drive, so i thought it was motor mounts, but when we got it checked out, the mechanic said it one injector wasnt firing at all.
    www.ThundaCats.com
    Tags: None
    • bmwannabe
      E30 Modder
      • Nov 2003
      • 900
      #2
      sounds like injector seals.

        Comment

        • Drake
          Member
          • Apr 2004
          • 67
          #3
          If it happens to be the injectors, they're either not working or they're clogged bad.

          1)To check if it's working, see if they vibrate when you touch them while the car is running.
          2)To check for clogs, you have to have a special BMW tool.

          I would first make sure they're all working (touch something metallic against them and you'll feel the vibration/buzzing, then do your prefered fuel system clean.

            Comment

            • arnoldgtr
              Advanced Member
              • Mar 2004
              • 153
              #4
              A code scanner is useless on that car.
              It doesn't have OBD or a check engine light.
              John
              88 ///M3 Cinnabar
              84 318i Black

                Comment

                • Dominick
                  Grease Monkey
                  • Aug 2004
                  • 323
                  #5
                  Originally posted by arnoldgtr
                  A code scanner is useless on that car.
                  It doesn't have OBD or a check engine light.
                  lol, i always wondered why ive never seen any check engine lights, i knew the car couldnt be perfect. i was just about to make a post to see how to make sure my check lights work.

                  thanks, im gonna check those injectors, and i got a bottle of sea foam ready those suckers
                  www.ThundaCats.com

                    Comment

                    • Dominick
                      Grease Monkey
                      • Aug 2004
                      • 323
                      #6
                      wow the seafoam kicked ass.

                      i dumped 1 bottle in the fuel tank (no time to go through vacuum lines). It rode like crap at first cuz i had 1/4 tank mixed with 1 can, but as soon as the seafoam got working and with the next tank, my car started riding 10x better.

                      Gas mileage has improved a tiny bit, before it was hard to keep the car at speeds, not it does it no problem. my idle is also a little smoother.

                      i highly recommend seafoam, im gonna get another bottle for the vacuum lines
                      www.ThundaCats.com

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