# Engine knock? or something else **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** pontiac, grand-am\ **Created:** [April 1, 2020, 8:11am UTC](https://community.cartalk.com/t/engine-knock-or-something-else/162255 "2020-04-01T08:11:28Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Warrensivrup\_166044](https://avatars.discourse-cdn.com/v4/letter/w/e56c9b/32.png) [@Warrensivrup\_166044](https://community.cartalk.com/u/Warrensivrup_166044)\ **Post date:** [April 1, 2020, 8:11am UTC](https://community.cartalk.com/t/engine-knock-or-something-else/162255/1 "2020-04-01T08:11:28Z")
Okay hey guys I’ve made a post about this before but old account wouldn’t let me login so had to make a new one, anyhow I’ve have this knock or tap in my engine that I’ve been trying to figure out for the longest time, it started about a year ago & could barely hear it at all I would have to point it out to my friend because it was so quiet but gradually got louder over time it’s a consistent knock or tap not clunky or off rhythm it matches rpm,///when I first start the car on cold start it takes 1-2 mins for it to start tapping then if I turn off & restart the car than it starts tapping immediately, I’ve changed these parts - This is a 3.400 v6 Egr Knock sensor Plugs&wires All lifters Injectors Oil pump Along with a few other odds and ends time serts for all rocker arms All new gaskets from the heads up I’ve checked the block & everywhere else for cracks all good there flex plate is good it isn’t an exhaust leak, rod bearings seem to have a lil walk side to side to them but for the most part I think they might be okay. The knock or tap seems to get louder if your underneath but idk maybe just a echo effect I’m posting a link it’ll take you strait to my engine tapping & you guys can tell me what you think [https://youtu.be/qhS3xyLGH7I](https://youtu.be/qhS3xyLGH7I) Also you can see im running it without the belt on so you can eliminate pulleys ---
**Author:** ![COROLLAGUY1](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/corollaguy1/32/7575_2.png) [@COROLLAGUY1](https://community.cartalk.com/u/COROLLAGUY1)\ **Post date:** [April 1, 2020, 9:06am UTC](https://community.cartalk.com/t/engine-knock-or-something-else/162255/2 "2020-04-01T09:06:38Z")
Unfortunately its a rod knock, a very common problem with this particular V6 . You can take off the head cover and see the rocker arms and bolts. On the bolts that are stripped use a 5/16 drill bit (says on the heli-coil pack) to drill out the bolt hole. Then use the tap for the heli-coil pack you purchased from your local auto shop, Use a M8 heli-coil and re-tap the hole. Place the heli-coil in the new hole and re-thread your bolts and rocker arm (Ensure you shop vac the mess out of the head and change your oil shortly after repairing).Hopefully that will take care of the problem ---
**Author:** ![Honda-Blackbird](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/honda-blackbird/32/3159_2.png) [@Honda-Blackbird](https://community.cartalk.com/u/Honda-Blackbird)\ **Post date:** [April 1, 2020, 12:08pm UTC](https://community.cartalk.com/t/engine-knock-or-something-else/162255/3 "2020-04-01T12:08:31Z")
Reread your post brother… ---
**Author:** ![Warrensivrup\_166044](https://avatars.discourse-cdn.com/v4/letter/w/e56c9b/32.png) [@Warrensivrup\_166044](https://community.cartalk.com/u/Warrensivrup_166044)\ **Post date:** [April 1, 2020, 6:25pm UTC](https://community.cartalk.com/t/engine-knock-or-something-else/162255/4 "2020-04-01T18:25:24Z")
I’ve already put time serts & helicoils in every hole above the head gasket this knock has nothing to do with stripped threads ---
**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:** [April 1, 2020, 8:20pm UTC](https://community.cartalk.com/t/engine-knock-or-something-else/162255/5 "2020-04-01T20:20:19Z")
Whew. New lifters? And timserts for the 12 rocker pedestals? You are determined. You know the I/E pushrods are different lengths. Hmm, I have done heads on 3 different 3.4’s lately and they are easy to work on. Disabling 1 cyl at a time makes no difference in knock? ---
**Author:** ![Warrensivrup\_166044](https://avatars.discourse-cdn.com/v4/letter/w/e56c9b/32.png) [@Warrensivrup\_166044](https://community.cartalk.com/u/Warrensivrup_166044)\ **Post date:** [April 2, 2020, 1:03am UTC](https://community.cartalk.com/t/engine-knock-or-something-else/162255/6 "2020-04-02T01:03:28Z")
Yea tell me about it lol I’ve put a lot of attention & money into it & to answer your question no it doesn’t make any difference each cylinder stays the same sound plugged or unplugged also yes I do know about the e/i pushrod length like I said this knock started gradually over a year