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Thanks Guys! I retarded timing... (archive)
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Posted by Pierre on December 22, 1999 at 07:03:27:

In Reply to: Re: High NOX emissions: What are we gonna do? posted by BB on December 21, 1999 at 20:10:06:

...as much as possible with the fuel quality switch (2.78 dgrees) in the FI control unit. Its euro motronic 1.0 w/o the O2 sensor. I put a set of cooler plugs in last night (W7DC) to get the comb. temp down. I'll try some more alcohol also.

: I live in the Seattle area and we also have extremely stringent emissions laws. I recently had a similar problem: the car would pass at cruise, but would fail at idle. The vehicle ran great: it had 160lbs of comp. and 20 inches of vacum at idle...but still failed. Just to get it past the test, I retarded (moved closer to TDC) the timing to the point where it would barely run. So when the spark would fire the exhaust valve would be starting to open...Although it ran terribly, it passed with flying colors, and I reset the timing as soon as I got home. (This old trick will not work however, if you are failing because of excessive hydrocarbons...)



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