JLU 2L turbo knocking noise

[ClayC]

My engine makes a loud pulsing noise which shakes the entire car on a cold start. Dealer couldn't find what it was. It goes away if you wait for a minute or if you put it in gear. What is this noise

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[8ball]

Our 2.0 sounds like an old Massey Ferguson tractor. I kinda like it….after all it’s a Jeep

 

[dchemphill1]

Is it the popping sound in the video? Otherwise it sounds like my 2.0 at start until warm up.
How many miles on it? Plug starting to fail? Recommended 60000 mile plug change on turbo.

 

[ClayC]

Yes it's the popping sound. In the video I'm at 90k miles but the dealer didn't find anything when I took it in. Not to mention that I haven't found any spark knock that really sounded like my problem.

 

[Remorseless]

Would suggest grabbing a video from outside the Jeep with the hood open so the engine could be heard better

 

[roaniecowpony]

How about a close up video of the tailpipe? It sounds like an afterfire when a rich fuel mixture ignites in the cats.

 

[roaniecowpony]

While a modern engine doesn't have a choke to richen the mixture for cold starts, the PCM still has to richen the mixture until it warms up. I had a LS Camaro that did this popping noise when it was cold and the mixture was rich.

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