Question about 2002 Jeep Liberty

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My 2002 jeep liberty failed the illinois Emission test !

I took my jeep liberty for the emmission test and it faied! do u have any suggestions why this may have happen? i have always kept up with my regular maintances. however a week ago, my jeep won't start and took it to the dealer and i was told that the vehicle had no problems, except that the battery had coersion! the dealer also completed a diagnostic and didnt find any issues!

thanx for your advice

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There are many items that will cause your truck not to be clean
when you spark get weak it will not burn all the fuel and not set a code so a good ign tune up pluga and plug wires and related parts and a good injector cleaner. then you need to take it out for a long drive to clean out the system. i have seen many cars not pass just because of alot of idle time.
you didnt say how many miles are on this jeep or how long since a tune up?
later paul

Posted on Nov 01, 2008

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