Quote:
Originally Posted by S-Class Guru
1. Clean the EGR line. (been awhile).
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I would be very interested in this. I passed my Virginia test yesterday, but with higher numbers than two years prior.
HC was 65 of an allowable 125(?) and NO was 0.17 of an allowable 1.00. Two years ago, HC was 7 and NO was 0.00.
The CEL has been illuminated for two years, with a 5-code at the DM. Would a clogged EGR tube cause this type of variance in emmissions results?
Also, the car was running quite hot before the test (after a long commute and extended idling at the inspection station) -- to the point where you start to smell that pungent, acrid aroma from the exhaust.
Could whatever was burning in the fuel have contributed to the elevated HC? The guy at the inspection station revved the engine for a few minutes (while reading the sports section of the paper) until the acrid smell was largely gone, before doing the test because, according to him, 90% of the E320s/W124s he tests Fail the first time. I am assuming this is because of the engine running hot and burning some otherwise stable fuel addititives, which causes the acrid fumes, and skews the tests.
Or is it a (temporarily) backed-up catalytic converter effect?