# 2000 Cadillac Eldorado - Odd sound after starting that then settles down **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** cadillac\ **Created:** [December 16, 2021, 10:57pm UTC](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321 "2021-12-16T22:57:09Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![GiovanniMoore](https://avatars.discourse-cdn.com/v4/letter/g/ecae2f/32.png) [@GiovanniMoore](https://community.cartalk.com/u/GiovanniMoore)\ **Post date:** [December 16, 2021, 10:57pm UTC](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321/1 "2021-12-16T22:57:09Z")
When I start my 2000 Eldorado Cadillac Etc it starts up but it makes a loud noise after starting for a minute what could that be it’s almost like a is hitting a fan or something5 ---
**Author:** ![Purebred](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/purebred/32/46796_2.png) [@Purebred](https://community.cartalk.com/u/Purebred)\ **Post date:** [December 16, 2021, 11:57pm UTC](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321/2 "2021-12-16T23:57:21Z")
My WAG, valve train noise. Noise diminishes as oil circulates. ---
**Author:** ![weekend-warrior](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/weekend-warrior/32/26122_2.png) [@weekend-warrior](https://community.cartalk.com/u/weekend-warrior)\ **Post date:** [December 17, 2021, 12:44am UTC](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321/3 "2021-12-17T00:44:41Z")
where is the noise coming from? inside, outside, front, back, underneath? what does the noise sound like? ticking, clunking, thud, rattle? if you can post a clip of the sound it might help. its hard to tell from here. ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [December 17, 2021, 1:58am UTC](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321/4 "2021-12-17T01:58:13Z")
I’d remove SERP belt and see if noise remains. As a test ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [December 21, 2021, 12:08am UTC](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321/5 "2021-12-21T00:08:46Z")
Pop the hood & ask a helper to start the engine while you listen to the engine area using a length of old garden hose as a stethoscope to narrow down where the noise is coming from. This sort of problem in cold weather is often related to a pulley or accessory belt. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [December 21, 2021, 12:22am UTC](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321/6 "2021-12-21T00:22:14Z")
The noise you hear might be coming from the secondary air injection pump. ![image](https://global.discourse-cdn.com/cartalk/original/3X/1/3/13c0c1074829431953026a23816b8f32a3d4f08a.png) This is an electric fan that injects air into the exhaust system to light off the catalytic converter(s) faster. Tester ---
**Author:** ![old\_mopar\_guy](https://avatars.discourse-cdn.com/v4/letter/o/6bbea6/32.png) [@old\_mopar\_guy](https://community.cartalk.com/u/old_mopar_guy)\ **Post date:** [December 21, 2021, 2:36am UTC](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321/7 "2021-12-21T02:36:44Z")
Why are we still recommending that folks monkey around with pieces of garden hose when you can get a mechanic’s stethoscope on Amazon starting at $8.37? ---
**Author:** ![Barkydog](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/barkydog/32/2470_2.png) [@Barkydog](https://community.cartalk.com/u/Barkydog)\ **Post date:** [December 21, 2021, 2:58am UTC](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321/8 "2021-12-21T02:58:59Z")
Had a bad tensioner, sounded like valve clatter to me, so many possibilities. Leave it overnight at a shop and let them figure it out was my cure, ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [December 21, 2021, 8:43pm UTC](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321/9 "2021-12-21T20:43:32Z")
> [@old\_mopar\_guy](#): > > recommending that folks monkey around with pieces of garden hose when you can get a mechanic’s stethoscope on Amazon starting at $8.37? Either way works. Seems more likely a diy’er solving a problem that requires the car tomorrow will have some old garden hose on hand. But if waiting for Amazon to deliver an auto-stethoscope is no problem, that’s a good alternative. ---
**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\ **Post date:** [December 21, 2021, 9:08pm UTC](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321/10 "2021-12-21T21:08:04Z")
And just how many people bother to keep old peices of garden hose around ? Not many is what I think . ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [December 21, 2021, 9:10pm UTC](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321/11 "2021-12-21T21:10:19Z")
Those that don’t will have to figure out another method, or wait for the Amazon truck to show up. Ray has recommended using vacuum hose on the show. I don’t get as good of results w/vacuum hose as garden hose. There’s probably a 100 different types & sizes of hose that might work, and an equal number that won’t. ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/48514_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [December 21, 2021, 10:30pm UTC](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321/12 "2021-12-21T22:30:32Z")
> [@VOLVO-V70](#): > > And just how many people bother to keep old peices of garden hose around ? I just threw a lot of old, hardened, leaky garden hose away. Why would I want to use that stuff in place of a stethoscope? ---
**Author:** ![Scrapyard-John](https://avatars.discourse-cdn.com/v4/letter/s/f6c823/32.png) [@Scrapyard-John](https://community.cartalk.com/u/Scrapyard-John)\ **Post date:** [December 21, 2021, 11:19pm UTC](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321/13 "2021-12-21T23:19:26Z")
Hmmm…so you did have some lying around… Besides, siphoning your neighbor’s gas with a stethoscope just doesn’t work as well. ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [December 22, 2021, 9:37pm UTC](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321/14 "2021-12-22T21:37:03Z")
> [@VDCdriver](#): > > I just threw a lot of old, hardened, leaky garden hose away. This sort of topic does nothing but clutter up the thread. If someone doesn’t think garden hose – or whatever a poster said they used as the proper method – the polite, courteous response is to simply post an alternative. For example: " Rather than garden hose I prefer a mechanic’s stethoscope." I expect OP’s are smart enough to determine which works best for them, on their own. ---
**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\ **Post date:** [December 22, 2021, 9:42pm UTC](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321/15 "2021-12-22T21:42:33Z")
> [@George\_San\_Jose1](#): > > I expect OP’s are smart enough to determine which works best for them, on their own. I doubt that . You can buy mechanics ears at Harbor Frieght real cheap . And they don’t require an unexperenced person to turn their eyes away from the turning fans and belts to use them as a piece of garden hose would. ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [December 22, 2021, 9:43pm UTC](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321/16 "2021-12-22T21:43:42Z")
> [@VOLVO-V70](#): > > they don’t require an unexperenced person to turn their eyes away from the turning fans and belts to use them as a piece of garden hose would. Since you insist on providing more clutter to this thread, explain > [@VOLVO-V70](#): > > I doubt that Are you referring to the OP? Why would you insult a poster here like that? It only drives folks with car problems away from the Car Talk web site. ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/48514_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [December 22, 2021, 9:59pm UTC](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321/17 "2021-12-22T21:59:42Z")
> [@George\_San\_Jose1](#): > > the polite, courteous response is to simply post an alternative. > For example: " Rather than garden hose I prefer a mechanic’s stethoscope." Which is why I also stated… > [@VDCdriver](#): > > Why would I want to use that stuff in place of a stethoscope? 🤔 ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [December 22, 2021, 10:01pm UTC](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321/18 "2021-12-22T22:01:46Z")
It’s a matter of emphasis I guess. IMO the polite courteous way to say that same thing is: “I prefer using a stethoscope to garden hose.” ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/48514_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [December 22, 2021, 10:03pm UTC](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321/19 "2021-12-22T22:03:50Z")
So, you think that I am discourteous and impolite? Really? ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [December 22, 2021, 10:04pm UTC](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321/20 "2021-12-22T22:04:48Z")
No, I don’t think that at all. But anybody can resolve to be more polite and courteous. Set you standards high, and others will likely do the same. [Next page](https://community.cartalk.com/t/2000-cadillac-eldorado-odd-sound-after-starting-that-then-settles-down/181321.md?page=2)