kook911 Posted July 23, 2014 Share Posted July 23, 2014 Ok the in this picture the hose that is going into the block. The hose is attach to the end of the air filter and in the pic it is attach to the engine. I am wondering do I need it and if I get rid of it do I need to plug the hole or what do I do with it? This pic is on the driver side block. It is coming off the headers and as you can see one is still intact and the other is broken off. Do i need to repair the broken one and if I do what is it that I need to repair. Link to comment Share on other sites More sharing options...
Eagle Posted July 23, 2014 Share Posted July 23, 2014 It doesn't go to the block, it goes to the exhaust manifold. The purpose is to draw heated air over the manifold while the engine is warming up. There is (or should be) a thermostatic damper at the point where that hose enters the air box. Can you get by without it? Most likely, yes. Most of them crumble and collapse after ten or fifteen years anyway. Link to comment Share on other sites More sharing options...
kook911 Posted July 23, 2014 Author Share Posted July 23, 2014 The hose is still in useable condition and where it enters the air box it still there. Link to comment Share on other sites More sharing options...
yellaheep Posted July 23, 2014 Share Posted July 23, 2014 The broken part on your manifold is your O2 sensor. Should be a ceramic end with wires that broke off. The wires for the sensor come from along side the valve cover to the front of the engine. They normally run down the intake manifold behind the p/s pump and down along the block to a connector held in place by a bracket off of the oil pan bolts. Surprised your rig is running worth a crap with that O2 sensor being out of the loop. Link to comment Share on other sites More sharing options...
kook911 Posted July 24, 2014 Author Share Posted July 24, 2014 Thanks for the info. I will check for the wires to see if they are still on the truck. For the most part I think it runs all right except the stalling issue that I posted a different thread for. Link to comment Share on other sites More sharing options...
ftpiercecracker1 Posted July 24, 2014 Share Posted July 24, 2014 (edited) You do not need that fabric/cloth hose and it will in no significant way effect the performance of the engine. However, if you O2 is busted/broken off you need to fix that ASAP. The only reason you might consider keeping that cloth sleeve would be if you live in a northern climate where the pre-warmed intake air coming off of the header would expedite the engine's warm up. Other than that, there is nothing to be gained from keeping it and removing it will only help tidy up the engine bay. Either way it really doesnt matter a whole lot. Edited July 24, 2014 by ftpiercecracker1 Link to comment Share on other sites More sharing options...
Jargon Posted July 24, 2014 Share Posted July 24, 2014 What a coincidence: just last night as I was working on the truck, I saw this cloth hose and thought, What on Earth! What is this for? Glad I decided to click though random threads today :thumbsup: Link to comment Share on other sites More sharing options...
ParadiseMJ Posted July 24, 2014 Share Posted July 24, 2014 The hose (tubing, duct, whatever) is in fact needed in most counties/areas of California. I removed mine when I first got the XJ, it passed smog. when I gave it to my son, the smog tech failed it because it was "an integral part of the Thermostatic Air Cleaner". He charged him $3.00 for the hose and installation. On my MJ I have and aftermarket intake...no hose. The intake is a CARB 50 state approved intake. Has a sticker with a CARB (California Air Resources Board) number and when the guy looked it up...he had to pass me. It is definitely not needed for any kind of performance or even emissions control...doesn't do squat except open the little servo at the front of the airbox to restrict cool (open) air into the box while the engine is warming up...when the engine warms up...the servo opens and lets the outside air in...which is also the purpose of the little round quarter size temp sensor on the back of a stock Renix airbox. The vac lines leading to and away from that need to be installed (and are included in the replacement vacuum harness). In CA you can't mess with the emissons at all, legally, unless it's CARB approved. Even my 5K watt generator and my leaf blower have emissions standards. Some other smog ridden states may require stock emissions as well. However, if you live in Texas, Middle Tennessee, or West Virginia...or yes, even Arizona...you're off the hook. Link to comment Share on other sites More sharing options...
Eagle Posted July 24, 2014 Share Posted July 24, 2014 In CA you can't mess with the emissons at all, legally, unless it's CARB approved. Even my 5K watt generator and my leaf blower have emissions standards. Some other smog ridden states may require stock emissions as well. However, if you live in Texas, Middle Tennessee, or West Virginia...or yes, even Arizona America ...you're off the hook. FIFY Link to comment Share on other sites More sharing options...
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