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1986 2.9 v-6 wont pass smog low idle hydrocarbons too high and high idle co too high new ecm tfi plugs wires cap rotor dipgyro etc ad nauseum what to look for next?
Zimdweebe
YOU MIGHT TRY INSPECTING AND CLEANING THE IDLE-AIR CONTROL SOLENOID (IAC). THIS ELECTRIC SOLENOID IS LOCATED ON THE THROTTLE BODY SOMEWHERE, AND IS MOUNTED BY PLUNGER INTO AN ORIFACE. ONCE YOU REMOVE THE IAC, CLEAN THE COMPLETE ORIFACE, THROTTLE BODY, AND PLUNGER OF ALL CARBON AND DEBRIS. THROTTLE BODY SPRAY CLEANER-NOT CARB CLEANER-SHOULD BE USED TO DISSOLVE THE DEPOSITS. AUTO STORES ALSO HAVE THIS PRODUCT CALLED "GUARANTEED TO PASS" ,WHICH SUPPOSEDLY CLEANS THE FUEL SYSTEM ENOUGH TO A POINT OF PASSING AN EMISSIONS TEST. IVE NEVER TRIED IT, BUT YOU SUPPOSEDLY WOULD GET YOUR MONEY BACK IF IT DIDN'T WORK. NEVERTHELESS, SOME SORT OF TOP-END CLEANING OF THE FUEL/AIR COMPONENTS IS RECOMMENDED.....GOOD LUCK!..BB
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∙ 17y ago
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