# What this sound? **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [March 23, 2021, 1:55am UTC](https://community.cartalk.com/t/what-this-sound/175784 "2021-03-23T01:55:44Z")\ **Posts on this page:** 17\ **Page:** 1
**Author:** ![jameson.luttrell\_154832](https://avatars.discourse-cdn.com/v4/letter/j/e274bd/32.png) [@jameson.luttrell\_154832](https://community.cartalk.com/u/jameson.luttrell_154832)\ **Post date:** [March 23, 2021, 1:55am UTC](https://community.cartalk.com/t/what-this-sound/175784/1 "2021-03-23T01:55:44Z")
2001 sonoma with 4.3. Just replaced intake manifold gaskets, water pump and took the starter out and put it back in. Today I started it up and it made a god awful noise. My first thought was rod knock. From the examples I’ve seen rod knock is cyclical and constant. I ran it without the belt, but nothing changed. Maybe a lifter? Starter alignment off? The youtube link is bellow. Thanks for any help. [![](https://global.discourse-cdn.com/cartalk/original/3X/8/2/82fe15d52de5d8a4f66d76f96b82a65c016e75c4.jpeg "IMG 1346 1") ](https://www.youtube.com/watch?v=ZrFk0T3WcfY) ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [March 23, 2021, 1:00pm UTC](https://community.cartalk.com/t/what-this-sound/175784/2 "2021-03-23T13:00:52Z")
Sounds more like an exhaust leak but the video clip wasn’t long enough to really tell. Maybe the heat riser passage isn’t sealed. That is a little opening between the intake ports that allows exhaust heat to warm the intake. If it isn’t sealed, you’ll hear an exhaust leak. ---
**Author:** ![jameson.luttrell\_154832](https://avatars.discourse-cdn.com/v4/letter/j/e274bd/32.png) [@jameson.luttrell\_154832](https://community.cartalk.com/u/jameson.luttrell_154832)\ **Post date:** [March 23, 2021, 3:28pm UTC](https://community.cartalk.com/t/what-this-sound/175784/3 "2021-03-23T15:28:49Z")
Thanks. I’ll get a better recording today. ---
**Author:** ![jameson.luttrell\_154832](https://avatars.discourse-cdn.com/v4/letter/j/e274bd/32.png) [@jameson.luttrell\_154832](https://community.cartalk.com/u/jameson.luttrell_154832)\ **Post date:** [March 23, 2021, 6:54pm UTC](https://community.cartalk.com/t/what-this-sound/175784/4 "2021-03-23T18:54:34Z")
[![](https://global.discourse-cdn.com/cartalk/original/3X/b/4/b423921e894c3d76ee06294a659fffb442a0297e.jpeg "IMG 1350") ](https://www.youtube.com/watch?v=PuppWPnQsvA) ---
**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:** [March 23, 2021, 7:01pm UTC](https://community.cartalk.com/t/what-this-sound/175784/5 "2021-03-23T19:01:23Z")
My bet is something you touched, ---
**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:** [March 23, 2021, 7:05pm UTC](https://community.cartalk.com/t/what-this-sound/175784/6 "2021-03-23T19:05:10Z")
Sounds like the timing chain is rubbing. ![image](https://global.discourse-cdn.com/cartalk/original/3X/8/e/8e9da85488baf7a504a952a64cd644e3ce44c234.jpeg) Tester ---
**Author:** ![jameson.luttrell\_154832](https://avatars.discourse-cdn.com/v4/letter/j/e274bd/32.png) [@jameson.luttrell\_154832](https://community.cartalk.com/u/jameson.luttrell_154832)\ **Post date:** [March 23, 2021, 7:29pm UTC](https://community.cartalk.com/t/what-this-sound/175784/7 "2021-03-23T19:29:37Z")
Is that likely to happen while changing the distributor? I did have to turn the crankshaft. ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [March 23, 2021, 7:54pm UTC](https://community.cartalk.com/t/what-this-sound/175784/8 "2021-03-23T19:54:09Z")
Noise, can’t tell where it is coming from… no stereo… can’t feel the vibration because I am not there… you should be able to feel where that is coming from… > [@Cavell](#): > > My bet is something you touched Bit of a snide answer BUT, that is very likely. It didn’t do it before your work and now it does. Pretty high likelihood it is something you touched. If you rotated the engine in reverse…you could have damaged the timing chain. ---
**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:** [March 23, 2021, 9:14pm UTC](https://community.cartalk.com/t/what-this-sound/175784/9 "2021-03-23T21:14:41Z")
Pulling distributor does not affect timing chain crank/cam physical timing. You did not touch pushrods with intake off? Or drop anything in intake ports? ---
**Author:** ![jameson.luttrell\_154832](https://avatars.discourse-cdn.com/v4/letter/j/e274bd/32.png) [@jameson.luttrell\_154832](https://community.cartalk.com/u/jameson.luttrell_154832)\ **Post date:** [March 24, 2021, 12:39am UTC](https://community.cartalk.com/t/what-this-sound/175784/10 "2021-03-24T00:39:57Z")
No I didn’t touch the pushrods and I’m 99% sure I didn’t drop anything. I forgot too mention that I did replace the valve cover gaskets if that makes a difference. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [March 24, 2021, 1:52am UTC](https://community.cartalk.com/t/what-this-sound/175784/11 "2021-03-24T01:52:44Z")
Remove the spark plugs and look into the cylinders to see what fell through the intake port when you had the intake manifold off. ---
**Author:** ![jameson.luttrell\_154832](https://avatars.discourse-cdn.com/v4/letter/j/e274bd/32.png) [@jameson.luttrell\_154832](https://community.cartalk.com/u/jameson.luttrell_154832)\ **Post date:** [March 24, 2021, 2:55pm UTC](https://community.cartalk.com/t/what-this-sound/175784/12 "2021-03-24T14:55:53Z")
I’ll do that when I get out of class. You’ve seen that happen before? ---
**Author:** ![Rod-Knox](https://avatars.discourse-cdn.com/v4/letter/r/a183cd/32.png) [@Rod-Knox](https://community.cartalk.com/u/Rod-Knox)\ **Post date:** [March 24, 2021, 4:09pm UTC](https://community.cartalk.com/t/what-this-sound/175784/13 "2021-03-24T16:09:19Z")
My first impression was an exhaust leak and repeatedly listening to the link only confirms my opinion. But noises like that have thrown me before and that’s why I own several stethoscopes with various attachments. ---
**Author:** ![bing](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bing/32/4619_2.png) [@bing](https://community.cartalk.com/u/bing)\ **Post date:** [March 24, 2021, 8:04pm UTC](https://community.cartalk.com/t/what-this-sound/175784/14 "2021-03-24T20:04:33Z")
Not that I know anything but I have had a few noises. First thing is to try to localize a little where it is coming from. If not from the timing chain area or deep in the engine, is anything hitting anything like the fan blades? The other thing is a leaky or misplaced plug wire can cause a tapping noise but usually with the resulting rough idle. Hard to tell from a couple thousand miles away though. ---
**Author:** ![oldnotdeadyet](https://avatars.discourse-cdn.com/v4/letter/o/a6a055/32.png) [@oldnotdeadyet](https://community.cartalk.com/u/oldnotdeadyet)\ **Post date:** [March 25, 2021, 12:45am UTC](https://community.cartalk.com/t/what-this-sound/175784/15 "2021-03-25T00:45:24Z")
The first thing I would do is pull off the valve cover and see what tool I left in there. ---
**Author:** ![jameson.luttrell\_154832](https://avatars.discourse-cdn.com/v4/letter/j/e274bd/32.png) [@jameson.luttrell\_154832](https://community.cartalk.com/u/jameson.luttrell_154832)\ **Post date:** [March 25, 2021, 2:40am UTC](https://community.cartalk.com/t/what-this-sound/175784/16 "2021-03-25T02:40:59Z")
I think you might be right ---
**Author:** ![jameson.luttrell\_154832](https://avatars.discourse-cdn.com/v4/letter/j/e274bd/32.png) [@jameson.luttrell\_154832](https://community.cartalk.com/u/jameson.luttrell_154832)\ **Post date:** [March 25, 2021, 2:41am UTC](https://community.cartalk.com/t/what-this-sound/175784/17 "2021-03-25T02:41:35Z")
I’m going to pull them here in a bit