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New noise? Engine or tranny?


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I have a noise that I only hear when in P or N. Sitting in the driveway with the brake on, when in D or R, it goes away. It's a slight knocking noise that I can hear easier with my head under the engine. Listening for the noise under the hood, it's not as noticeable. Could it be the transmission or ? The transmission shifts fine. I haven't yet changed the tranny fluid, but it does smell somewhat burned, but has smelled that way for quite awhile. This is yet another problem I've encountered since my last road trip to the mountains. No more mountains for this Caddy!

Adallak, I remember you had a noise, did you ever find out what that was? Does this noise sound similiar to yours? I can't remember if you heard yours in P/N or not.

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At what RPM are you getting this noise. I used to get a metallic noise in N and P when I raced the engine to about 1200 to 1500 RPM, it was a scary noise, is that what you are getting?

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

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I have a noise that I only hear when in P or N. Sitting in the driveway with the brake on, when in D or R, it goes away. It's a slight knocking noise that I can hear easier with my head under the engine. Listening for the noise under the hood, it's not as noticeable. Could it be the transmission or ? The transmission shifts fine. I haven't yet changed the tranny fluid, but it does smell somewhat burned, but has smelled that way for quite awhile. This is yet another problem I've encountered since my last road trip to the mountains. No more mountains for this Caddy!

Adallak, I remember you had a noise, did you ever find out what that was? Does this noise sound similiar to yours? I can't remember if you heard yours in P/N or not.

Epricedright,

My noise is different. I can hear it only while driving. There is no noise in P or R while idling. The noise is RPM related not speed related. The tone changes when I switch to N while driving (because RPM changes). It does sound as a bad bearing, bu I cannot figure out where it comes from.

I would change ATF and filter ASAP. For a better result I would disconnect cooliung line and run engine in P to get rid of all 8 qts of ATF. Dropping the pan allows you to replace only 5-6 gts. I would disconnect the line right on the bottom of transmission, so that ATF would come down directly to your collecting pan. There should be a check ball or something , do not lose it. Or disconnect it from the radiator. It is the LOWER line. Description in the FSM is confusing, and I remember one of our members disconnecting the upper line and having ATF pouring from the radiator cooler instead.

The saddest thing in life is wasted talent

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At what RPM are you getting this noise. I used to get a metallic noise in N and P when I raced the engine to about 1200 to 1500 RPM, it was a scary noise, is that what you are getting?

I get the noise at idle. I think also while revving...I need to check again.

I have a noise that I only hear when in P or N. Sitting in the driveway with the brake on, when in D or R, it goes away. It's a slight knocking noise that I can hear easier with my head under the engine. Listening for the noise under the hood, it's not as noticeable. Could it be the transmission or ? The transmission shifts fine. I haven't yet changed the tranny fluid, but it does smell somewhat burned, but has smelled that way for quite awhile. This is yet another problem I've encountered since my last road trip to the mountains. No more mountains for this Caddy!

Adallak, I remember you had a noise, did you ever find out what that was? Does this noise sound similiar to yours? I can't remember if you heard yours in P/N or not.

Epricedright,

My noise is different. I can hear it only while driving. There is no noise in P or R while idling. The noise is RPM related not speed related. The tone changes when I switch to N while driving (because RPM changes). It does sound as a bad bearing, bu I cannot figure out where it comes from.

I would change ATF and filter ASAP. For a better result I would disconnect cooliung line and run engine in P to get rid of all 8 qts of ATF. Dropping the pan allows you to replace only 5-6 gts. I would disconnect the line right on the bottom of transmission, so that ATF would come down directly to your collecting pan. There should be a check ball or something , do not lose it. Or disconnect it from the radiator. It is the LOWER line. Description in the FSM is confusing, and I remember one of our members disconnecting the upper line and having ATF pouring from the radiator cooler instead.

Is that a "new" way to change the fluid? I always heard dropping the pan was best. When disconnecting the cooling line on the tranny, I still need to drop the pan as well to change the filter and clean the magnet, right? Is it ok to start the car while on jack stands? Does the fluid come shooting out hard once started, and does it shoot out the tranny and just drip out the hose?

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Describe the noise, is it a metal on metal deep sound. Sort of a metallic RAP. When the noise happens the car moves, even though its in P or N. Lift the hood with the car idling, stand to the SIDE, and raise the idle manually opening the throttle slowly to about 2000 RPM and see if you can cause the noise. DO NOT raise the idle any higher once you hear the noise (if you do) return to IDLE immediately. If you get the noise notice if the car moves. Mike

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

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Is there anything in the tranny that could likely make a knocking noise? The noise is more pronounced listening from the driver side wheel well. It's not a deep knock like my #1 main thump...hard to describe. I'm hear by myself, the noise doesn't seem to get louder while revving.

I just noticed grease on my driver side CV joint boot as well...sweet! It's the one closest to the tranny. Are those difficult to replace? My repair list (to do list) is getting so long...pretty discouraging!

Describe the noise, is it a metal on metal deep sound. Sort of a metallic RAP. When the noise happens the car moves, even though its in P or N. Lift the hood with the car idling, stand to the SIDE, and raise the idle manually opening the throttle slowly to about 2000 RPM and see if you can cause the noise. DO NOT raise the idle any higher once you hear the noise (if you do) return to IDLE immediately. If you get the noise notice if the car moves. Mike

I just noticed your reply Mike. I'll do what you said...brb

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Describe the noise, is it a metal on metal deep sound. Sort of a metallic RAP. When the noise happens the car moves, even though its in P or N. Lift the hood with the car idling, stand to the SIDE, and raise the idle manually opening the throttle slowly to about 2000 RPM and see if you can cause the noise. DO NOT raise the idle any higher once you hear the noise (if you do) return to IDLE immediately. If you get the noise notice if the car moves. Mike

No, the car does not move while in P while revving. I'm not positive about this, but it doesn't appear to be rpm related, as the noise it there at idle, but I can't hear it while revving...maybe it's there but is drowned out by the engine noise ???

Unfortunately I cannot describe the noise I'm hearing, but it does sound like a metal knock/rap. It's not loud or obnoxious. I heard this noise when I first got back from that mountain trip, but thought I was hearing things...hardly noticable. The noise seems a little more pronounced now though, so it may be getting worse, which worries me.

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This noise you are having probably is the #1 main bearing knock. Try taking the accessory belt off while the engine is cool and see if the noise is still there. Dont let the engine run too long with the belt off, Adallak boiled over but I dont think his car was cool when he took it off, or he drove it a distance.

What oil are you using?

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

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This noise you are having probably is the #1 main bearing knock. Try taking the accessory belt off while the engine is cool and see if the noise is still there. Dont let the engine run too long with the belt off, Adallak boiled over but I dont think his car was cool when he took it off, or he drove it a distance.

What oil are you using?

Correct, my car was hot. I warmed it up to catch that "hot engine slightly open throttle knock".

At what RPM are you getting this noise. I used to get a metallic noise in N and P when I raced the engine to about 1200 to 1500 RPM, it was a scary noise, is that what you are getting?

I get the noise at idle. I think also while revving...I need to check again.

I have a noise that I only hear when in P or N. Sitting in the driveway with the brake on, when in D or R, it goes away. It's a slight knocking noise that I can hear easier with my head under the engine. Listening for the noise under the hood, it's not as noticeable. Could it be the transmission or ? The transmission shifts fine. I haven't yet changed the tranny fluid, but it does smell somewhat burned, but has smelled that way for quite awhile. This is yet another problem I've encountered since my last road trip to the mountains. No more mountains for this Caddy!

Adallak, I remember you had a noise, did you ever find out what that was? Does this noise sound similiar to yours? I can't remember if you heard yours in P/N or not.

Epricedright,

My noise is different. I can hear it only while driving. There is no noise in P or R while idling. The noise is RPM related not speed related. The tone changes when I switch to N while driving (because RPM changes). It does sound as a bad bearing, bu I cannot figure out where it comes from.

I would change ATF and filter ASAP. For a better result I would disconnect cooliung line and run engine in P to get rid of all 8 qts of ATF. Dropping the pan allows you to replace only 5-6 gts. I would disconnect the line right on the bottom of transmission, so that ATF would come down directly to your collecting pan. There should be a check ball or something , do not lose it. Or disconnect it from the radiator. It is the LOWER line. Description in the FSM is confusing, and I remember one of our members disconnecting the upper line and having ATF pouring from the radiator cooler instead.

Is that a "new" way to change the fluid? I always heard dropping the pan was best. When disconnecting the cooling line on the tranny, I still need to drop the pan as well to change the filter and clean the magnet, right? Is it ok to start the car while on jack stands? Does the fluid come shooting out hard once started, and does it shoot out the tranny and just drip out the hose?

You still can drop and clean the pan, and change the filter. I described the way to get rid of ALL old ATF. I do not know how fast it shoots, but I would definitely retract and disconnect the ISC motor to have predictably low RPMs. You can lower the car, do not start it on jacks.

The saddest thing in life is wasted talent

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This noise you are having probably is the #1 main bearing knock. Try taking the accessory belt off while the engine is cool and see if the noise is still there. Dont let the engine run too long with the belt off, Adallak boiled over but I dont think his car was cool when he took it off, or he drove it a distance.

What oil are you using?

I'm using Rotella 15W40. She definately has the #1 main bearing knock and I've been aware of that for some time. Most noticeable when the engine is under load (going up my driveway) in drive. I have isolated that noise by loosening the belt and power braking (it then goes away).

This new noise is a different noise. I'm thinking it's tranny related since I can hear it only in P or N. I've never heard a tranny make a noise like this before though...can trannies make a knock/rap type noise? What else could it possibly be?

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Well the noise I was speaking about, I had in my 91 Seville, it was the sprag in the transmission. Your noise does not sound like it, unless the sprag is failing in a different manner in your case.

Here is a list of sprags for the 4T60E

http://www.bulkpart.com/Merchant2/merchant...Code=4T60Esprag

See the Sprag assembly in 3900F in this schematic

http://www.aceomatic.com/catalog/automatic...asp?t=15&i=3900

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

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A engine mount or anti-roll bar bracket broken perhaps?

It sounds more like something in the tranny or engine, not a rattling noise though.

Well the noise I was speaking about, I had in my 91 Seville, it was the sprag in the transmission. Your noise does not sound like it, unless the sprag is failing in a different manner in your case.

Here is a list of sprags for the 4T60E

http://www.bulkpart.com/Merchant2/merchant...Code=4T60Esprag

See the Sprag assembly in 3900F in this schematic

http://www.aceomatic.com/catalog/automatic...asp?t=15&i=3900

Figures I'd have a problem that no one else has experienced...just my dumb luck! Besides normal maintenance items, I may just turn it into a beater car and just drive it till the wheels fall off. I hate to do it, but my list is getting long! Of course, I'm talking out loud right now, but my frustrations with this car are overwhelming at times.

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You know, I agree with you 100%. Once my 91 got to a point where it was not worth fixing and the problems got too big, I got rid of it. A whole slew of problems occurred at once with it and it was officially the end. You are sounding a lot like the way I felt. Drive it.... I am selling my Deville once I finish replacing what I have not replaced on it YET.... :lol:, I would be honored if you would buy it from me! Mike (so i can buy an STS, :lol:) (just kidding, if you might want to trade up higher than a 96)

I am going for a ride now in it, Good Night

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

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You know, I agree with you 100%. Once my 91 got to a point where it was not worth fixing and the problems got too big, I got rid of it. A whole slew of problems occurred at once with it and it was officially the end. You are sounding a lot like the way I felt. Drive it.... I am selling my Deville once I finish replacing what I have not replaced on it YET.... :lol:, I would be honored if you would buy it from me! Mike (so i can buy an STS, :lol:) (just kidding, if you might want to trade up higher than a 96)

I am going for a ride now in it, Good Night

Mike,

I would certainly consider buying your caddy from you. I was thinking I'd go a little newer, but you never know in the used car market what you're getting, newer or not. Atleast with yours, I'll know what I'm buying, and have peace of mind knowing things were done right. Let me know when you're ready to sell and we'll talk. Do you have a price in mind yet?

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I will send you a PM with a list of replaced or planned replaced items. I can tell you its a lot more expensive to replace parts than to buy a new car, :lol:.... I just took it for a long ride, its the first time the roads are dry since I did my front end over....all I can say is WOW, its quiet, stable and tight. I took a long very tight turn at 65 tonight effortlessly, that previously I would feel shaky with at 55 with squealing tires. What a difference, it glides. It was only 53 degrees out so I had the benefit of cold air... Its ALMOST back to spec.. a few more items to fix

post-2998-1148271316.jpg

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

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Bruce,

Considering the ongoing issues with describing sounds...

Any chance to add a spot to attach sound files?

How about a "Guess the Caddy Sound" contest?

Just thinkin outloud again... :rolleyes:

Add power to leave problems behind. Most braking is just - poor planning.
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Bruce,

Considering the ongoing issues with describing sounds...

Any chance to add a spot to attach sound files?

How about a "Guess the Caddy Sound" contest?

Just thinkin outloud again... :rolleyes:

TDK,

I'm so glad my problem inspired you to come up with a "contest" idea. I feel honored!

Just thinkin outloud again... :rolleyes:

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File holding sites like filelodge.com are happy to hold your mp3 for you, then you can link it here. Also soundclick.com will let you upload an unlimited number of mp3s; they are expecting that you are uploading music, but that's all in the ear of the listener, based on some 'songs' that are loaded there now.

Bruce

2016 Cadillac ATS-V gray/black

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Epricedright,

We all feel bad for you... If say, there were a crack in flexplate (not a big deal), would not it make noise in gear? Just a thought.

The saddest thing in life is wasted talent

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sorry i didnt feel like reading the rest of the replys.... on my 00 deville it turned out to be an oil pump in the tranny... they come in sets of 3. kinda a chain rapping noise. good luck

That could be what it is, not sure ???

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sorry i didnt feel like reading the rest of the replys.... on my 00 deville it turned out to be an oil pump in the tranny... they come in sets of 3. kinda a chain rapping noise. good luck

sorry i didnt feel like reading the rest of the replys.... on my 00 deville it turned out to be an oil pump in the tranny... they come in sets of 3. kinda a chain rapping noise. good luck

That could be what it is, not sure ???

I have heard of that type of thing myself..

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  • 5 months later...

I was looking for a past post and ran across this old thread I forgot to update. After changing my tranny fluid this summer I noticed that noise got worse. I let the tranny expert at Schmidt Automotive listen to it and he thought it was the chain in my tranny slapping a little and said it was nothing to worry about, as long as it didn't get any worse. He mentioned that since I just had my fluid changed was maybe why it was then more pronounced. Afterwards, I took it on a road trip in July, and the noise had lessened and it's hardly noticeable at all now. As a matter of fact, I haven't heard it all lately. I can't recall the name of the chain, but he said it was a really big chain in the tranny. Does anyone recall the name of this chain?

I just thought I would update this thread in case anyone else has this problem.

Also, I thought my tranny fluid smelled burnt. Two mechanics smelled it and they thought it smelled perfectly normal, so that was good news. I obviously haven't smelled a "cooked" tranny before...which is a good thing I guess. The pan was clean as well. So hopefully all is well...fingers crossed.

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  • 1 month later...

In my 1992 Seville,

I'm getting the same type of noise only when I'm in Drive and brakes applied, like at a stop light. The other odd thing is it doesn't happen all the time only if the car is not level (or close). It sounds like the auto-leveling system but I removed the fuse in the trunk and disabled it, so I thought. When I'm getting the noise, I can put in P or N and it goes away. Any ideas of what it could be?

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