A Clunk Produced When the Engine Is Running, NOT When It's Off

A CLUNK THAT CAN BE PRODUCED WHEN THE VEHICLE'S ENGINE IS RUNNING BUT NOT WHEN IT'S OFF (1998 BUICK REGAL GS, 1998 OLDSMOBILE INTRIGUE)

This type of noise is likely to be a steering gear condition; specifically too much clearance between the seal on the power piston and the groove that the seal rides in. This excessive clearance lets the piston seal knock inside the groove during turns.

- With the vehicle stationary and the engine running, turn the steering wheel rapidly back and forth over it's center position. Complete a cycle of both directions about once a second. The wheel must be turned this quickly in order to bring about the noise. Next, repeat this rapid turning over center with the engine off.

- If the clunk was present with the engine on, but not when turned off, the rack may be the source. Verify the date of vehicle manufacture. This condition was corrected in production by February 1,1998. If the vehicle is older then this date and has not had a steering rack replacement, replace the rack. If the vehicle is newer than February 1,1998 refer to the applicable Service Manual and follow the normal diagnostic procedures before changing the rack.