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O2 sensor definitely likely candidate.
Posted by Aaron Gilbert [Email] (more from Aaron Gilbert) on Thu, 29 Jul 2004 10:13:51
In Reply to: Causes for HIGH output of HC, bstan, Thu, 29 Jul 2004 08:05:28
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My car has failed emissions twice since I've had it. The first time I got it to squeak by with some 'Guaranteed to Pass' fuel system cleaner and a tune up; plugs, distributor cap and rotor, plug wires. The second time it was no go. Replacing the O2 sensor helped and did significantly increase mileage, but in the end I needed a new Air Mass Meter (AMM). Then it passed with flying colors. In fact, it was almost too good to believe, some readings were at or near zero emissions, and MPG was like 36 when previously it was about 30. Shortly thereafter it was determined that my remanufactured AMM was defective and making the car run too lean. Since then I have passed with flying colors with another AMM, but never again as low as when the lean running AMM was installed. :)
Aaron Gilbert
1987 9000T 309k miles
posted by 198.22.12...
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