Knocking noise and stalling

SouthArk370Z

Yes.
Yes.
Probably not but it may make it feel like it's slipping.
Yes.

When cats fail, they usually cause more restriction in the exhaust flow. This can cause your symptoms (except for slipping clutch).

However, a bad cat should throw a DTC. I don't think it's a cat problem but wouldn't swear to it at this point.

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James512

Yea, this is where I am too. Im not positive its a slipping clutch, it could have just been a couple of random misfires. I cant believe the noise in that video could be from a broken honeycomb inside a cat. I will verify with the garden hose idea before I replace anything.

Looks like I will be buying some high flow cats and if this doesn't fix the problem, back to the dealer. I just feel like the noise is coming from in front of the cats. I could be wrong though. Dealer quoted $2200 for them to do it.

SouthArk370Z

I wouldn't start throwing parts at it just yet. Of course, if you plan on getting HFCs in the future, this might be a good time to do it.

It will make things a lot easier if you have a helper when trying to locate where the noise is coming from - one person can move around and listen while the other manipulates the throttle and clutch.

Good luck and be safe.

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James512

The dealer has come to the conclusion that its the cats. I found some for around 500. Once I have it on a lift, I will definitely listen to where the noise is coming from before I make the purchase. I have Monday off so that would be a good day for me to do the swap and take it back to the dealer if that doesn't work. I don't have many miles left on my warranty and I still think it is the tranny.

Thanks for the responses.

nis350

aren't the cats covered under the warranty? some states have longer warranty on the emission parts than the regular warranty.

you can probably find an used set of cats for less than $200.

Good luck.

James512

I was told 8 years or 80k. I'm at 99k. I'll look into the state thing. The dealer said I should reach out to consumer affairs.