evans Posted December 3, 2009 Author Share Posted December 3, 2009 i used some of that high temp rtv on both gaskets. just torque the @!*% out of it and let it sit for a while. Link to comment Share on other sites More sharing options...
Tungsten Posted December 3, 2009 Share Posted December 3, 2009 tried that i found out my problem first of all i should have replaced the catalytic converter i didn't want to do it because this one passed the inspection and it looked really clean inside what happened was the catalyst material inside got dislodged and is now bouncing around in there Link to comment Share on other sites More sharing options...
Precise1 Posted December 3, 2009 Share Posted December 3, 2009 Yeah, the exhaust shop I used had several pieces of cats that had done that. I got a Magnaflow 2" direct fit, flanged cat through performancepeddler.com. It was $130 with free shipping IIRC, the cheapest I could find. Make sure to call/email for price. You may be able to get a better price on a slightly different unit as mine had to be Cali CARB legal. B Link to comment Share on other sites More sharing options...
Tungsten Posted December 3, 2009 Share Posted December 3, 2009 i just got a universal one for $60, also from magnaflow i don't live in calicake so mine is cheaper and i didn't get flanges, i already had enough fun dealing with 2 of them just cut and weld http://www.amazon.com/MagnaFlow-53004-Universal-Catalytic-Converter/dp/B000COWZRU/ref=cm_cr_pr_product_top Link to comment Share on other sites More sharing options...
jl6630 Posted December 6, 2009 Share Posted December 6, 2009 so good news is i got the stud out without breaking an easy out. but its still making the noise! gaskets are all fine. could it be warped or maybe a crack in the downpipe? I'm kind of in the same boat as you. I went mudding (claying?) and the clay that shot up covered my exhaust the other day and i had not a single tick. as time consuming as this was i would spray off the clay in sections too pinpoint where exactly the leak was coming from. found that i had a crack in my manifold. i'm sure you could find an easier way than this but i just thought id share it with you since it worked very well for me. not saying go mudding and see what happens but get some sort of clay and cover sections of your exhaust where you think it might be and that will help you pinpoint it. Link to comment Share on other sites More sharing options...
Tungsten Posted December 10, 2009 Share Posted December 10, 2009 (edited) OH DAMN IT!!! My old catalytic converter apparently was broken at the inlet, when I took it out a bunch of core material which was trapped at the bottom of the converter came out from the in side. The outlet was clean so I assume nothing traveled into the muffler. So I got the catalytic converter replaced with a Magnaflow one and here is my setup: Doug Thorley Short Tube Headers 2.00" Piping 2.00" Magnaflow Catalytic Converter 2.00" Flowmaster 60 Delta Flow muffler Now I have a big problem, there is a rattling sound whenever I step on the gas pedal in Drive after standing on the brakes at a traffic light. It only happens under load and mostly when the truck is warm. I don't have any heat shields, except on the catalytic converter which is brand new now. The crossover pipe fitting is tack welded and the muffler is welded as well. All I could come up with was the flanges between the 2.00" and 2.25" may not be lining up but then that has a new gasket. The other flange after the midpipe was redone and has a new gasket as well. Could my crossover pipe be hitting against the frame? Is the muffler underrated for the V6? I'm going nuts here... Also, the knock sensor hears this banging and detects it as a knock causing my engine to bog down. Edited December 10, 2009 by Tungsten Link to comment Share on other sites More sharing options...
Precise1 Posted December 11, 2009 Share Posted December 11, 2009 Could my crossover pipe be hitting against the frame? You need to crawl your exhaust, meaning inspect the entire length of it for clearance while examining all hangers and checking all bolts. Use something metalic to bang against it to see if you can make the rattling sound. Be patient, you are almost there... B Link to comment Share on other sites More sharing options...
Tungsten Posted December 11, 2009 Share Posted December 11, 2009 ill check ASAP but banging on it just makes a hollow sound like banging on an empty pipe which is what it should sound like as theres no debris in it (hopefully all debris was trapped in the old cat) im thinking its the 2.25 to 2.00 flange thats causing all the racket Link to comment Share on other sites More sharing options...
Tungsten Posted December 11, 2009 Share Posted December 11, 2009 (edited) FOUND IT!!! I blame Nissan for the stupid ass design. The bended pipe section (where the O2 sensor is) is hitting the frame when the engine shakes. So what now? Can I heat wrap it so when it rubs the impact absorbs? Edited December 11, 2009 by Tungsten Link to comment Share on other sites More sharing options...
Precise1 Posted December 11, 2009 Share Posted December 11, 2009 Try modifying the hangers to pull it away from the contact point first. B Link to comment Share on other sites More sharing options...
GrimGreg Posted December 11, 2009 Share Posted December 11, 2009 Try modifying the hangers to pull it away from the contact point first. B Yeah, you might have a broken hanger further back that is allowing it to drop down and hit the crossmember. Link to comment Share on other sites More sharing options...
Tungsten Posted December 11, 2009 Share Posted December 11, 2009 its not hitting the crossmember but rubbing against the side of the weird round thing (the pipe is bent around it) Link to comment Share on other sites More sharing options...
Tungsten Posted December 17, 2009 Share Posted December 17, 2009 ok i need help the truck runs like @!*% its bogging down when i hit the gas when cruising, the rpms bounce up and down is it because of the timing? its either the pipe hitting the part of the crossmember and the knocking is triggering the knock sensor or something else is screwing with the ECU which is causing the engine to shake and bang the pipes looks like im gonna be walking soon Link to comment Share on other sites More sharing options...
Precise1 Posted December 18, 2009 Share Posted December 18, 2009 Ok, Start back at ground 1. Check the ECU for codes. Do you have fuel flow (how old filter?) Ignition: cap, rotor, wires or plugs?? B Link to comment Share on other sites More sharing options...
Tungsten Posted December 18, 2009 Share Posted December 18, 2009 (edited) Ok, Start back at ground 1. Check the ECU for codes. Do you have fuel flow (how old filter?) Ignition: cap, rotor, wires or plugs?? B Brand new ignition: cap, rotor, wires, and plugs ALL FROM DEALER, GENUINE NISSAN PARTS Fuel filter might be a problem but I only changed that a year ago I do have clicky fuel injectors but they were like this since I got this truck Edited December 18, 2009 by Tungsten Link to comment Share on other sites More sharing options...
Tungsten Posted December 18, 2009 Share Posted December 18, 2009 (edited) Ok I did the codes again this morning and its coming up with this 34 Knock Sensor. WTF?! Hopefully the sensor is good, I guess the rattle from the pipe is causing the code. Here you can see where it may be hitting... Edited December 18, 2009 by Tungsten Link to comment Share on other sites More sharing options...
adamzan Posted December 19, 2009 Share Posted December 19, 2009 I remember when I first got my truck there was a piece of cardboard between the exhaust and a crossmember, maybe you should put something in between there. But not cardboard! Link to comment Share on other sites More sharing options...
Tungsten Posted December 19, 2009 Share Posted December 19, 2009 high temp silicone?! what did you do? Link to comment Share on other sites More sharing options...
Tungsten Posted December 21, 2009 Share Posted December 21, 2009 (edited) UPDATE took a little off the frame as pipe bending did not work too well so no more cats full of marbles, i cleared the knock sensor code, its not coming back now there is so much flow in my exhaust that the engine doesn't work right when it warms up and runs slightly rich its good but when it goes into closed loop oh boy when starting to accelerate now it doesn't dump enough fuel and almost stalls out the engine it used to rely on the extra back-pressure to keep it going but not anymore i guess ill have to see if i can re-program the ECU to make it run right again so need some serious help here i will continue here: http://www.nissanpathfinders.net/forum/index.php?showtopic=24955 Edited December 21, 2009 by Tungsten Link to comment Share on other sites More sharing options...
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