ABS Self-test and "Forward clunk" sounds on 850


Forward Clunk on Take off [850][1996] ... posted by Rollo  on Wednesday, 28 February 2001, at 11:14 a.m.
 

                      Clunk, or Pop. Seems to occur from a dead stop and related to rotation of the drive shafts. Lock to
                      Lock turns at speed (~15 mph) do not indicate clunking or pops from CV joints. Seems to be located
                      below and to the front of the console area, maybe a little to the right. Not loud but noticeable. Clunk, or
                      Pop. Does not increase in duration, frequency or audible level on accelleration. Only happens once per
                      take-off from standing. Had transaxle seals replaces ~1200 miles ago. Any ideas?

                      TR



... posted by Prospero  on Wednesday, 28 February 2001, at 11:51 a.m. ...in response to "Forward Clunk on Take off" posted by Rollo.

                      Maybe a trans mount/ motor mount gone bad. Just a thought...

                      Prospero



... posted by JC  on Wednesday, 28 February 2001, at 4:31 p.m. ...in response to "Re: Forward Clunk on Take off" posted by Prospero.

                      Does it happen at 20 MPH. If so it is probably your ABS braking system.



Re: Forward Clunk on Take off [850][1996]... posted by Bill  on Wednesday, 28 February 2001, at 9:18 p.m. ...in response to "Re: Forward Clunk on Take off" posted by JC.

                      The first time I go forward after start-up I can here a similiar metal,tin sound under the right front. It only happens after cold start-up.



... posted by Michael Krutolow  on Thursday, 1 March 2001, at 12:31 a.m. ...in response to "Re: Forward Clunk on Take off" posted by Bill.

                      Thanks your ABS doing its self test...totally normal. I too thought something was wrong when i 1st got my 850.

                      Mike



... posted by Rollo  on Thursday, 1 March 2001, at 10:34 p.m. ...in response to "Re: Forward Clunk on Take off" posted by Bill.

                      I have determined that the clunk is really two sounds. A double pop from the right front wheel... maybe
                      a stuck caliper piston, and a single metalic "clunk" from directly in front of the instrument consol but only
                      upon cold start up. I suspect the later is transmission related .. i.e. low ATF fluid. Long into short, I had
                      to repalce my AT plug and lost some fluid ~ 1 pint and it shows low on the AT dipstick. I'll start there
                      and work my way to the engine mount and brakes. Send information if you have a determination of
                      yours.

                      Thanks,

                      TR



 
 

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