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: Smog Kevin Jespersen 02-12-2002, 03:21 PM Allright , I tried to get my 90 Jeep cherokee smoged today but it failed. the CO% was to high along with the NO(PPM). i was wondering if you guys had any advice on what to do to bring it down. i had just changed my oil about 600 miles ago. my mistakes were i didnt run 92 octane or clean my air filter before the test. please help thanks Kevin jp junkie 02-12-2002, 03:50 PM How many miles? How old is the O2 sensor? How old is the cat? Usually if the O2 sensor is bad it will give you high COs, unless you have other vaccum problems. Kevin Jespersen 02-12-2002, 04:33 PM The motor has about 100,000 the cat is old as the jeep,the co sensor is pretty new i think but i am missing one of those little plastic vacume hoses that goes to the air cleaner. thanks kev SMART ASS 02-12-2002, 05:36 PM Time for a new cat bud I'll bet you 100$ that you'll pass with a new cat! Here's what you need to do! 1)new fuel cap 2)New filters all 3)Buy some of that "pass smog" crap from any auto store and also some stuff called "HEET" its a gas preservative for extreem cold. Add these both to a 1/4 tank of gas, drive you truck for 30 mins on the freeway... NICE AND HOT 4)With your cat nice and hot, it will effectively burn all the HC and O2 & NO. AND PASS THAT SMOG :) :) PS: INSTALL THE CAT 1 DAY BEFOR YOU GET SMOGGED :) AND CHECK FOR AIR LEAKS Originally posted by Kevin Jespersen The motor has about 100,000 the cat is old as the jeep,the co sensor is pretty new i think but i am missing one of those little plastic vacume hoses that goes to the air cleaner. thanks kev CJ-Jeeper 02-12-2002, 06:28 PM i have heard you don't want to use high octane gas. It is less volitile & will not burn as completely as lower octane. SMART ASS 02-12-2002, 06:31 PM Well I havnt hear crap about that, I have only "DONE THIS" I own a 1985 Ford Ranger with a 2.8L V6 it gets about 6-10mpg and would never pass smog, unless in installed a new cat, and ran fuel additive... Trust me these will help.... The higher the octain the better it will burn and the cleaner... Originally posted by CJ-Jeeper i have heard you don't want to use high octane gas. It is less volitile & will not burn as completely as lower octane. Steve N 02-12-2002, 11:41 PM Matt/CJ Jeeper's right DO NOT use higher octane gas. http://www.visi.com/~rhayman/smog_faq.html Check out the link I got it from Welding Demon AKA Mark/welndmn Try posting in General too. Mark, and a few other guys were smog refs or techs. ROKWALKER 02-13-2002, 12:03 AM EGR valve. Clean it out .......replace the gasket and go pass smog. | |