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Showing results for tags 'valve guides'.
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hi i am new to the fourm and also new to owning a 88 jeep comanche. i went to try and pass emissions and no luck. first time i went i got pass on hc fail co 26.45 actual, 25 limit. and pass on nox. second time after adding special additive to the fuel (which has always help my vehicles pass with flying colors) i failed again this time 25.51co. i really need to regester this truck and every thing that i look at seems to be fine. i checked: map iat or mat as jeep refers to it cts spark fuel injectors cat o2 compression changed oil checked valve springs when i preformed a vacuum test i found that it jwas bouncing between 17-19 at idle which is an indication of valve guide wear, no other signs are evident; i.e. smoke or fouled plugs. it also has an intermittent miss that i can't pin to a cylinder. truck has 150+ miles on it. i am really at a loss. any ideas would be great.
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i am new to the fourm and new to owning an 88 jeep comanche. i just went to go to emissions and failed high co actual 25.51 and allowable 25.00; so not by much. i have checked the fuel injectors, spark, compression, map, o2 sensors, cat, and i did a vacuum test which said that the vavle guides are worn but not very badly it bounced at idle between 16-18in hg at idle. no smoke at start up cold or hot, and no smoke during run. the cat is new and it is possible that it is compensating by burning the oil, but i have no clue. it also has a intermittent miss that i can't seem to pin down. i am at a loss, pls anybody ideas?
