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NOX TEST 700 1985

posted by  someone claiming to be Art on  Thu Oct 3 09:51 CST 2002 [RELATED]

My 85 740 failed its emission test today. NOX too high. (about 2400 vs 1400 pass) All others , CO + HC in good shape.
THe test centre "diagnosed" (I use the word loosely) a new converter. However, I question their judgement:

- If the CO and HC are well within limits, surely the converter must be active ?

- In 85, was the converter a "3-way" (CO / HC / NOX) type or just COI + HC ?

The brick dealer said to try Bosch Pt plugs, set wide. Swore by it.
Other info - non-turbo, 290,000 km, original cat. hot air hose missing.

The new screwy Ontario test rules don't actually oblige me to fix it as it would cost > $200, but the requirements get more stringent in 2 years time. So I'd like to fix it by then.

Could it be that I have bad injectors, which would not burn all the fuel, leave high O2 and create NOX, then the converter burns the rest and gets good CO/HC ? I doo have a slight, occasional hesitancy when cold.

Any good advice out there?






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New NOX TEST [700][1985]
posted by  someone claiming to be Art  on Thu Oct 3 09:51 CST 2002 >


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