brmurph Posted September 21, 2006 Report Share Posted September 21, 2006 I have a strange noise comming from the rear suspension that goes ping ping ping (sounds like a hot motor cooling off ony louder), you can hear the noise from 50 yards or more. You can also make it happen somtimes when you push down on the rear of the car. The noise seems to be coming from the right rear of the car. I haven't crawled under the car yet to check it out, was hoping someone could help me identify what it might be first. Any thoughts? Thanks. Link to comment Share on other sites More sharing options...
BodybyFisher Posted September 21, 2006 Report Share Posted September 21, 2006 If your 98 is the same as my 96, the air suspension compressor is located at the right rear area. Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
brmurph Posted September 22, 2006 Author Report Share Posted September 22, 2006 If your 98 is the same as my 96, the air suspension compressor is located at the right rear area. That is true but that was replaced a couple of years ago also the power should be off on the compressor when the key is off (I think :-). Good thought though. Thanks. Link to comment Share on other sites More sharing options...
BodybyFisher Posted September 22, 2006 Report Share Posted September 22, 2006 When you said motor cooling off, that is what came to mind, that motor as there are no other motors back there. I would put your hand on the compressor and see if its overheating Could this be your muffler system cooling? Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
brmurph Posted September 22, 2006 Author Report Share Posted September 22, 2006 When I say motor cooling off I shoud probably said exaust cooling off cause your right that is exactly what this sounds like except about 5 times louder (too loud to be exaust I would think). Link to comment Share on other sites More sharing options...
BodybyFisher Posted September 22, 2006 Report Share Posted September 22, 2006 All I can say is the next time it happens get under there with a stethiscope and listen closely.. Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
Regis Posted September 22, 2006 Report Share Posted September 22, 2006 When do you hear the ping ping ping sound? After parking the car and getting out? Or is it all the time? How many pings do you hear during each occurrance? If you hear the pinging sound when you get out of the car and or while pushing down on the rear bumper then I would suspect your right rear knuckle needs replacing. When my rear knuckle went bad I would get 2-4 pings in a row after parking and exiting the car. I could induce the pinging by pushing down on the bumper and also by pulling up on the wheel well on the afflicted side. "Burns" rubber " I've never considered myself to be all that conservative, but it seems the more liberal some people get the more conservative I become. " Link to comment Share on other sites More sharing options...
epricedright Posted September 22, 2006 Report Share Posted September 22, 2006 When do you hear the ping ping ping sound? After parking the car and getting out? Or is it all the time? How many pings do you hear during each occurrance? If you hear the pinging sound when you get out of the car and or while pushing down on the rear bumper then I would suspect your right rear knuckle needs replacing. When my rear knuckle went bad I would get 2-4 pings in a row after parking and exiting the car. I could induce the pinging by pushing down on the bumper and also by pulling up on the wheel well on the afflicted side. What in the knuckle was causing the "pinging" you think? Link to comment Share on other sites More sharing options...
Regis Posted September 22, 2006 Report Share Posted September 22, 2006 When do you hear the ping ping ping sound? After parking the car and getting out? Or is it all the time? How many pings do you hear during each occurrance? If you hear the pinging sound when you get out of the car and or while pushing down on the rear bumper then I would suspect your right rear knuckle needs replacing. When my rear knuckle went bad I would get 2-4 pings in a row after parking and exiting the car. I could induce the pinging by pushing down on the bumper and also by pulling up on the wheel well on the afflicted side. What in the knuckle was causing the "pinging" you think? The bushing inside the sleeve dried up causing a metal to metal contact. When weight (ex: getting in and driving or pushing on the bumper) was added it would cause the knuckle to load up so to speak. The ping sound was the knuckle unloading. It almost sounds like the pinging is coming from the rim itself. Since the knuckle is located directly behind the wheel it's easy to see why that is. "Burns" rubber " I've never considered myself to be all that conservative, but it seems the more liberal some people get the more conservative I become. " Link to comment Share on other sites More sharing options...
brmurph Posted September 22, 2006 Author Report Share Posted September 22, 2006 When do you hear the ping ping ping sound? After parking the car and getting out? Or is it all the time? How many pings do you hear during each occurrance? If you hear the pinging sound when you get out of the car and or while pushing down on the rear bumper then I would suspect your right rear knuckle needs replacing. When my rear knuckle went bad I would get 2-4 pings in a row after parking and exiting the car. I could induce the pinging by pushing down on the bumper and also by pulling up on the wheel well on the afflicted side. What in the knuckle was causing the "pinging" you think? The bushing inside the sleeve dried up causing a metal to metal contact. When weight (ex: getting in and driving or pushing on the bumper) was added it would cause the knuckle to load up so to speak. The ping sound was the knuckle unloading. It almost sounds like the pinging is coming from the rim itself. Since the knuckle is located directly behind the wheel it's easy to see why that is. This sounds exactly like my problem as I hear the pings just after I park the car and get out. It is not all the time but normally can be heard for 5-10 minutes after I park. I would say maybe 10-15 pings on each occurrence (could be more, never really counted:-). Did you do replace the knuckle yourself or have it done? Do you remember the cost? Thanks. Link to comment Share on other sites More sharing options...
Regis Posted September 23, 2006 Report Share Posted September 23, 2006 Sounds like we're getting close. One last test before we assume it's the knuckle. Either pull up on the bumper or grab ahold of the wheel well and slowly pull up. Do you hear the pinging sound? "Burns" rubber " I've never considered myself to be all that conservative, but it seems the more liberal some people get the more conservative I become. " Link to comment Share on other sites More sharing options...
brmurph Posted September 23, 2006 Author Report Share Posted September 23, 2006 Not so much pulling up but definitely pushing down. As soon as you touch the rear end with as little as one finger you start to hear the noise. Link to comment Share on other sites More sharing options...
Regis Posted September 23, 2006 Report Share Posted September 23, 2006 Not so much pulling up but definitely pushing down. As soon as you touch the rear end with as little as one finger you start to hear the noise. Here are some other posts regarding your problem with knuckle prices and where to buy them. http://caddyinfo.ipbhost.com/index.php?sho...&hl=knuckle http://caddyinfo.ipbhost.com/index.php?sho...&hl=knuckle http://caddyinfo.ipbhost.com/index.php?sho...&hl=knuckle "Burns" rubber " I've never considered myself to be all that conservative, but it seems the more liberal some people get the more conservative I become. " Link to comment Share on other sites More sharing options...
BodybyFisher Posted September 23, 2006 Report Share Posted September 23, 2006 I just ordered a knuckle from gmotors for Stefan in Germany, here is the price and part number, if I recall he has a 96 Seville, Mike LR KNUCKLE (18026757) - $367.09 Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
brmurph Posted September 23, 2006 Author Report Share Posted September 23, 2006 Great info thanks. Link to comment Share on other sites More sharing options...
Cadillac Jim Posted September 23, 2006 Report Share Posted September 23, 2006 Pardon me for not getting this in sooner, but the leveling system stays on for 5 minutes after you turn off the key "to allow for levelling when you remove luggage or golf clubs from the trunk." -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
brmurph Posted December 16, 2006 Author Report Share Posted December 16, 2006 Just wanted to post a follow up to this problem, I replaced the knuckle and that seems to have fixed the problem. The part was very easy to replace but also very expensive, got the part from gmotors.com for just under $400.00 . BTW very impressed by gmotors.com, great price and quick service. Thanks to everyone for the help and special thanks to Regis for suggesting the knuckle.. Link to comment Share on other sites More sharing options...
Regis Posted December 17, 2006 Report Share Posted December 17, 2006 Just wanted to post a follow up to this problem, I replaced the knuckle and that seems to have fixed the problem. The part was very easy to replace but also very expensive, got the part from gmotors.com for just under $400.00 . BTW very impressed by gmotors.com, great price and quick service. Thanks to everyone for the help and special thanks to Regis for suggesting the knuckle.. That's terrific news. Yeah the price of a knuckle is enough to take one's breath away. I'm still trying to catch mine lol. Isn't this Cadillac site great? The information and help on here has saved me thousands of dollars on repairs. Thanks for following up and posting about the successful repair. "Burns" rubber " I've never considered myself to be all that conservative, but it seems the more liberal some people get the more conservative I become. " Link to comment Share on other sites More sharing options...
BodybyFisher Posted December 17, 2006 Report Share Posted December 17, 2006 Yes gmotors.com is great, I love those guys. Glad to hear you go it fixed, the symptom (ping ping ping from rear, only hear it when the car is parked) did not direct me to the rear knuckle, it would not have occured to me since when the car is parked the rear knuckle is motionless. It was a good pick up by Regis. Does your car handle any better with the new knuckle? Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
brmurph Posted December 17, 2006 Author Report Share Posted December 17, 2006 Yes gmotors.com is great, I love those guys. Glad to hear you go it fixed, the symptom (ping ping ping from rear, only hear it when the car is parked) did not direct me to the rear knuckle, it would not have occured to me since when the car is parked the rear knuckle is motionless. It was a good pick up by Regis. Does your car handle any better with the new knuckle? I would say this was something that did not really effect the handling (at least not yet :-) but more of an anoying noise when parked and also when going over bumps. That said it was obvious that the bushing was in bad shape just by looking at it and if it got much worse it probably would have caused handling issues. Link to comment Share on other sites More sharing options...
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