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Just from my experience with my car thats pretty much exactly what it was doing. Thank god Mercedes warrenties theirs to 100000miles cuzz they both went bad b4 that just barely lol but if not it wouldve been over a grand to replace them!

Some people need a sympathetic pat... on the head...with my hammer

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sounds alot like your cats are bad.

I 2nd this

Just had an 03 silverdao with a 5.3 in the shop wednesday with missfire codes and a cat efficiency issue, damn thing had no power at all. pulled the exhaust loose on one side and she ran like a striped ass ape.

Being you have 02 sensors b4 and after the cat, throw a back pressure gauge on it and get some readings, anything over 2psi of back pressure and yer screwed. and be sure to check them with the rpms raised up as well, not just at idle. If ya dont have access to the tool, just drop the exhaust off one side.

Aftermarket cat assembly aught to run you bout $750. A dealer part would be prefered due to some aftermarket cats not burning correctly and setting codes after replacement but when i called the dealer they were out of stock in all the warehouses in the midwest and were on back order.

Good luck man

Edited by kandiman71874

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The shop next to my house told me they will replace each cat for $240 each.

to include parts and labor? lucky bastage :lol:

Some people need a sympathetic pat... on the head...with my hammer

Scientia est Vox

"In Nomine Patris et Filii et Spiritus Sancti"clover.gif

DONT BE AFRAID TO USE THE SEARCH BUTTON!!!

SMD SUPER BUYER/SELLER

Roscoe.jpg

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I 2nd this

Just had an 03 silverdao with a 5.3 in the shop wednesday with missfire codes and a cat efficiency issue, damn thing had no power at all. pulled the exhaust loose on one side and she ran like a striped ass ape.

Being you have 02 sensors b4 and after the cat, throw a back pressure gauge on it and get some readings, anything over 2psi of back pressure and yer screwed. and be sure to check them with the rpms raised up as well, not just at idle. If ya dont have access to the tool, just drop the exhaust off one side.

Aftermarket cat assembly aught to run you bout $750. A dealer part would be prefered due to some aftermarket cats not burning correctly and setting codes after replacement but when i called the dealer they were out of stock in all the warehouses in the midwest and were on back order.

Good luck man

I thought about doing that, disconnecting the exhaust from the headers and see what happens? How much does a back pressure gauge cost?

Team Deadly Hertz

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The shop next to my house told me they will replace each cat for $240 each.

Keep the old ones and turn them in for scrap. The have platinum in them and you can get about $80 each

you can cook bacon shirtless if you're not a pussy...lol

not hatin, but am i wrong here it looks as if the amp is not grounded its hooked directly to the battery. it that the way it should be.

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