Engine tapping on cold start off fast idle

F-1shakey

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Hi this is my first post and unfortunately it’s not a positive one, but here it is.....
I’ve got a 2021 2dr sport with 3.6 and 6 speed and I’m having some engine noise that I would like to find out if is normal or not? When I start the jeep it immediately goes to fast idle for 20-30 seconds and when coming down to normal idle speed I’m getting a tapping/ticking sound for around 5 seconds and was wondering if anyone else has experienced this?
I also want to add that when driving for the first couple km I can hear the tapping sound until it warms up slightly





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F-1shakey

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Here is a video of the noise
 
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Mfarr75

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This doesn't sound bad or abnormal to me. I hear a slight rattle toward the end of the audio but that could just be a rocker arm before it gets fully oiled up on a cold start. I have the same engine and at fast idle after a cold start up, it can be noisy.

Remember the 3.6 uses a valve train with rocker arms for the valves, so these can be noisy until everything gets warmed up and the rocker arms get fully lubricated. A lot of people grouse about these engines sounding like sewing machines, etc, and that's just the valve train at work, and normal. If you have a bad rocker, it will tick very loudly. Not a sewing machine ticking noise at all, and you'll know it when you hear it.

I would be more concerned with excessive noise on a fully warmed up engine. And the most concerning noise would sound like an old diesel engine, with a loud knocking type noise from the bottom end of the engine.
 
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Jeep1967

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I have the same motor. I had similar issues with abnormal noise. I took it in to the dealer and they replaced cam and other components. Made a big difference. Had it happen a few months later, took it in and they replaced the other side. So far the engine is now fine. I hope. I also wondered if the noise was normal but when I took it in they said definitely not. I’d have it checked out soon.
 
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F-1shakey

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I have the same motor. I had similar issues with abnormal noise. I took it in to the dealer and they replaced cam and other components. Made a big difference. Had it happen a few months later, took it in and they replaced the other side. So far the engine is now fine. I hope. I also wondered if the noise was normal but when I took it in they said definitely not. I’d have it checked out soon.
Alright thanks for the reply, I’ve got the jeep going into the dealership next week so hopefully this can get taken care of.
 
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F-1shakey

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If dealer tells you normal, try 5-20w on next oil change. It helps quite it down.
Ive tried 5w30 full synthetic aswell as conventional both ms6395 approved and did not make a difference in the particular sound I’m having. The heavier weight oil did improve the overall engine noise and made it sound a little less “worn out” when it was at operating temperature though.
 

Qjoh5510

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Any updates? For the noise you’re hearing, can it only be heard from the outside of the vehicle? And on the driver side? I know I said I didn’t have any issue in another thread but today I happens to be next to it after I remote started it and heard a little rattle sound for a few seconds as it was coming off high idle. Kind of sounded like a loose heat shield almost. I’m interested as to what your dealer will have to say.
 
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F-1shakey

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Any updates? For the noise you’re hearing, can it only be heard from the outside of the vehicle? And on the driver side? I know I said I didn’t have any issue in another thread but today I happens to be next to it after I remote started it and heard a little rattle sound for a few seconds as it was coming off high idle. Kind of sounded like a loose heat shield almost. I’m interested as to what your dealer will have to say.
I picked it up from the dealer yesterday and was told that the tech did hear the noise and is now waiting the hear back on how to proceed, so I should have a better answer sometime next week. Also the noise is mostly on the driver side area and if you know what your listening for can be heard inside the cab.
 

Kevin Mojito

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That's good news. At least you did not get the "no problem found".
 

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