Jeep Wrangler Forum

Jeep Wrangler Forum (
-   YJ General Discussion Forum (
-   -   Need Help! 94 YJ won't pass emissions (

ChiroSean 10-21-2008 09:02 PM

Need Help! 94 YJ won't pass emissions
I just bought my first Jeep and can't get it to pas the clean air check here in Indiana. After the first test I changed the plugs, wires, cap and rotor, and repaired the vacuum line between the air box and the PCV. I took it back and had it tested again today and it failed worse than the first time.:banghead: The hydrocarbons and CO levels are much higher now. I looked at several sites online and there a ton of suggestions, but I thought I would look for some more Jeep specific info if anyone has had similar problems. My Jeep is a 2.5L with a % speed manual trans. Thanks. Also what should the normal operating temp be? Mine runs at or just above 210. Do I need a new thermostat or just flush the cooling system? thanks!!!

jpdocdave 10-21-2008 09:36 PM

that temp is fine, and you probably need a new cat.

ChiroSean 10-22-2008 10:45 AM

Thanks. Some people told me to check the O2 sensor, MAP sensor, and MAF sensor. Also they said that changing the engine oil to fresh oil before I take it back for another test might help. I also found a vacuum line up near the passenger side fire wall that I can not find a place where it would go??? My jeep doesn't have AC or cruise control or anything so, not sure where it would go. Any suggestions? Thanks again.

All times are GMT -5. The time now is 04:37 AM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.