Another Supercharger Idle problem thread | Starting to get desperate

[NissanTracker]

Originally Posted by TheFLiP

Have you checked your cats? I ended up replacing the engine because my tune was too rich for the cats and it melted it and sealed it up...

I went and got headers and test pipes to go with the new engine. Worth a shot?

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Interesting, I would think that going too lean (increase in heat) would cause the cats to go. I have a lift at home, so i'll put it up this weekend and check the cats. I used to have HFCs and I blew through those. I put stock cats on and has only been 1K miles tops on them with the S.C. Cats have 50K miles on them. I have been planning on using some testpipes and welding on some Cats from a v8 or something.

[TheFLiP]

Originally Posted by NissanTracker

Interesting, I would think that going too lean (increase in heat) would cause the cats to go. I have a lift at home, so i'll put it up this weekend and check the cats. I used to have HFCs and I blew through those. I put stock cats on and has only been 1K miles tops on them with the S.C. Cats have 50K miles on them. I have been planning on using some testpipes and welding on some Cats from a v8 or something.

I just learned that after I'd melted my HFCs. Basically running rich has excess fuel that exits the engine and into the cats causing another detonation/combustion. In this case, it's a lot hotter than the exhaust since the cats are having to deal with direct flame which exceeds it's heat tolerance and causes it to fail.

When HFCs failed, it sealed up and blew back debris into the engine. Hopefully, this isn't the case with you.

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[NissanTracker]

Originally Posted by TheFLiP

When HFCs failed, it sealed up and blew back debris into the engine. Hopefully, this isn't the case with you.

hmm... there was a light bulb for a second there. But, i had the hot idle issue with the HFC's before one of them blew up. I probably should have done a second leak down before going to the A-A kit. I did one before the supercharger set up somewhere between 40-50 miles just to be sure.