|I will be taking my truck for inspection next month (Texas). Last year it |failed NOX test-all other passed. I was able to get 1 year exemption. | | I replaced EGR valve last year (after failing first test), but still failed |NOX. I believe carbon buildup is main cause of failing the emissions test, |but don't know this for sure. The truck runs well. I don't drive it much |anymore, which could be cause of carbon buildup. It has low mileage for the |truck's age. | |Any suggestions on how to pass the NOX test, or how to reduce carbon |buildup? Mechanics have quoted $300-$500 to remove & clean intake |manifold-too much for an old truck. | |Thanks | |1982 F100, 302 V8 |131000 miles-purchased new in '82
Berryman's makes a couple of kits for that purpose. I haven't used them but we started selling the heck out of them when the new testing came in in January.
Product # 2610 TOTAL COMBUSTION SYSTEM CLEANER KIT - POURIN
-------------------------------------------------------------------------------- Formulated with High Energy Solvent Technology (H.E.S.T.) to clean the intake valve and combustion chamber. One treatment provides two instant emission improvements! Total Combustion System Clean-Up removes preformed deposits in the combustion chamber, reduces intake valve and port deposits and prevents recurring deposits. Enhances performance, reduces maintenance and improves hydrocarbon and carbon monoxide emissions. High Energy Solvent Technology (H.E.S.T.) Sizes Available:
2610 NET 16 fl. oz. Pour Can Line Art
Products 2616 B-12 CHEMTOOL® TOTAL FUEL SYSTEM CLEAN-UP (T.F.S.C.) - POURIN
-------------------------------------------------------------------------------- Formulated with High Energy Solvent Technology (H.E.S.T.) and state of the art detergent to maximize and accelerate the cleaning of intake valves, fuel injectors and combustion chambers. TFSC attacks carbon deposits in the entire fuel system to help restore peak performance, improves starting, driveability and gas mileage. One application is good for 3000 miles. High Energy Solvent Technology (H.E.S.T.) Sizes Available:
2616 NET 16 fl. oz. Long Neck Aluminum Bottle (NOTE: Also available as part of kit #2620)
Let me know if theses help. I have the same problem on my '94
Rex in Fort Worth