alex79 Posted March 23, 2014 Share Posted March 23, 2014 will it harm the engine if I don't replace the cats that went bad on my 06 pathfinder? I was looking to just run the exhaust straight off the headers Link to comment Share on other sites More sharing options...
bushnut Posted March 23, 2014 Share Posted March 23, 2014 It might not hurt the engine, but it will hurt the wallet if the smog police catch you... Link to comment Share on other sites More sharing options...
alex79 Posted March 24, 2014 Author Share Posted March 24, 2014 I am the police.lol Link to comment Share on other sites More sharing options...
Precise1 Posted March 24, 2014 Share Posted March 24, 2014 Then you should know that it against federal law to remove the cats from the exhaust system, not to mention socially irresponsible. Will it hurt the vehicle/motor, no. Will it speak negatively of you, yes. B 1 Link to comment Share on other sites More sharing options...
5523Pathfinder Posted March 24, 2014 Share Posted March 24, 2014 As I agree with the above, I will state that you will also have a decrease in overall performance by deleting the cats. Without programming or a way to manipulate the air/fuel and o2 sensors, you will have less power, mileage and overall driveability. There are aftermarket options available(magnaflow) to help keep costs down over factory units. 1 Link to comment Share on other sites More sharing options...
bushnut Posted March 24, 2014 Share Posted March 24, 2014 supposedly clogged cats can be cleaned with mild dish soap and water....?? haven't tried it but unless they are rusted out it might work at least worth a try as compared with buying new ones. Link to comment Share on other sites More sharing options...
alex79 Posted March 24, 2014 Author Share Posted March 24, 2014 do the cats that are not direct fit have to be welded to the header Link to comment Share on other sites More sharing options...
Terranovation Posted March 24, 2014 Share Posted March 24, 2014 Clogged cats cannot be washed out with dish soap and water - I used to fit exhaust systems back in the day and we would oxy cut open dead catalytic converters and inside them is a honey comb material which the exhaust gases have to pass through. Nothing you can do once it's clogged - you replace it. Link to comment Share on other sites More sharing options...
bushnut Posted March 24, 2014 Share Posted March 24, 2014 thats why I said "supposedly" it was just something I saw on the interweb. thanks for clearing that up. Link to comment Share on other sites More sharing options...
Precise1 Posted March 24, 2014 Share Posted March 24, 2014 do the cats that are not direct fit have to be welded to the header Many after market cats are bolt on direct fit, and other are universal weld in. The weld ins are usually cheaper, but require more labor to install and are obviously harder to remove in the future. Without knowing the exact specs of what you need (trim level may affect fitment and I'm guessing you only need 49 state compliance) here are some examples of that are available. http://www.autopartswarehouse.com/shop_years/nissan-pathfinder-catalytic-converter-2006.html http://www.amazon.com/gp/part-finder/slide-show/2006/Nissan/Pathfinder?ie=UTF8&partsNode=15726731 What was the reason the original cats failed? Make absolutely certain the cause is rectified before proceeding. B Link to comment Share on other sites More sharing options...
adamzan Posted March 24, 2014 Share Posted March 24, 2014 (edited) How can "all" the cats be bad? Are you just getting catalyst codes? Honestly I don't think cats can "clog" unless something physically enters the exhaust or the engine overheats so much that the honeycomb stuff melts and restricts. People just use it as an excuse to remove them. I am not an expert but have been almost screwed over by mechanics before telling me this fairy tale. Edited March 24, 2014 by adamzan Link to comment Share on other sites More sharing options...
Precise1 Posted March 24, 2014 Share Posted March 24, 2014 Running too rich can load up/clog the honey comb with unburned hydrocarbons and I've heard that running too lean/hot can break down the honey comb base material (they aren't solid platinum, paladium, etc!) causing it to break, creating it's own debris to clog its self. Yeah, the cats can fail/be clogged. Others can work for 30 years... B Link to comment Share on other sites More sharing options...
ahardb0dy Posted March 24, 2014 Share Posted March 24, 2014 mine was clogged on my sentra, I know they say ( which of course makes sense) to fix what ever caused the cat to clog first or a new one will do the same thing, But my car is a 90, I can see it getting clogged over all those years, burning oil, additives, etc. the OP pathfinder is a 2006. I can't see them being clogged in 8 years especially as Adam said all of them. Link to comment Share on other sites More sharing options...
ahardb0dy Posted March 24, 2014 Share Posted March 24, 2014 The cat from my car, I don't think it was running rich, maybe burning a little oil as it gets up in age 259K miles original engine, so overtime they can clog but as I said it's 24 years old. clogged cat inlet: outlet: Link to comment Share on other sites More sharing options...
Terranovation Posted March 25, 2014 Share Posted March 25, 2014 That looks reasonable for being original part used for 259k miles. It's maybe got another 2 to 3 years to go before it's completely stuffed imo having worked in the exhaust industry. Link to comment Share on other sites More sharing options...
ahardb0dy Posted March 25, 2014 Share Posted March 25, 2014 (edited) I removed it for now, will get a universal one someday, I could tell from how the exhaust sounded that something was wrong, mpg came up by 3 too Edited March 25, 2014 by ahardb0dy Link to comment Share on other sites More sharing options...
thorpe991 Posted March 28, 2014 Share Posted March 28, 2014 if you hit the cats on stuff it can break the comb loose and turn and act as a clogged cat it happened on my camaro but thats cause the catonly sits 2" off the ground (the cat is visible from under the car when looking at the passenger side the actule body sits about 4-5 " off the ground so any speed bumps and im hitting the cat Link to comment Share on other sites More sharing options...
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