Announcement

Collapse
No announcement yet.

need help diagnosing

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
    #1

    need help diagnosing

    i've looked around on many other threads and searched but before I buy anyhting I want to be sure on what to get.

    the problem: the car is a 91 318is(m42 ftw haha')
    at really low rpm's (like when the car begins to push itself) and when i shift and let the clutch out quick there is a loud clunk at the rear end in most gears. also if i tap the gas quick to make the car 'jump' it will do the clunking noise.

    those are usually the only things that make the noise. its only unintentional to make the noise when shifting tho..


    TIA!
    Last edited by wolfgangstbd; 04-05-2009, 01:17 PM.
    Tags: None
    #2
    The usual suspect is U-joints with what you describe

    Closing SOON!
    "LAST CHANCE FOR G.A.S." DEAL IS ON NOW

    Luke AT germanaudiospecialties DOT com or text 425-761-6450, or for quickest answers, call me at the shop 360-669-0398

    Thanks for 10 years of fun!

    Comment

      #3
      Also take a look at the rear differential mount and the channel it is mounted to on the floor pan.
      I'm Not Right in the Head | Random Rants and other Nonsense1st Order Logic Failure: Association fallacy, this type of fallacy can be expressed as (∃x ∈ S : φ(x)) → (∀x ∈ S : φ(x)), meaning "if there exists any x in the set S so that a property φ is true for x, then for all x in S the property φ must be true".

      Comment

        #4
        my diff mount seems fine.. how do i check my u joints

        Comment

          #5
          Originally posted by wolfgangstbd View Post
          my diff mount seems fine.. how do i check my u joints
          Kind of need to pull the drive shaft, but try twisting it back and forth by hand and look for play.

          How about the upper strut guides (rear shock mounts)?

          The rear diff mount can "oil can lid" the trunk floor and eventually the channel welds give out , causes a bang going over speed bumps and on quick decell and accels, not super common on street cars (unless you drive like me) but it happens.
          I'm Not Right in the Head | Random Rants and other Nonsense1st Order Logic Failure: Association fallacy, this type of fallacy can be expressed as (∃x ∈ S : φ(x)) → (∀x ∈ S : φ(x)), meaning "if there exists any x in the set S so that a property φ is true for x, then for all x in S the property φ must be true".

          Comment

            #6
            yeah im going to check my u joints when i get off spring break and go back to school so i can put it on a lift... im going to check my rsm's the next time i walk to my car. I think the problem is u joints though.. what effect would a bad csb have?

            thanks guys!

            Comment

              #7
              It'll thump around in its housing and sound like an overly-enthusiastic working girl turned loose on a dude with a crappy bed.

              In my experience, u-joints can be felt more than heard, and usually give the driveshaft a loose, vauge feel. Torn-up CSB will wobble and bang around anytime the load on the driveshaft changes quickly.
              sigpic

              Mike

              '91 325i track car. Mostly...

              Comment

                #8
                ya it doesnt feel "bad" it just clunks

                Comment

                Previous template Next
                Working...
                X