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In Reply to: Re: High NOX emissions: What are we gonna do? posted by BB on December 21, 1999 at 20:10:06:
Beware! California CARB anticipated this trick.
The smog station checks the timing and will fail
the car if advanced or retared out of range.
I experienced this first hand on a Ford with
a replaced throttle position sensor. The mechanic
thought he was doing me a favor.
My additional hindsight recommendation for older
cars is to ask for a non-official, off the record
smog check first. Then, you can correct problems
without risking dreaded "Gross Pollutor" status.
BTDT.
You still need expert advice on how to improve
the emission problem.
: : As I cannot get my euro 635 (with CAT) thru the 2 speed VA emissions because of the high nitrogen oxides (NOX), I am hearing evermore stories about older Bimmers with the M30 big sixes and M10 4 cyls blowing too high NOX at lower rpms (less than 1500). At 2300 rpms the NOX falls to passing levels (about 990 ppm), but the treadmill machine wont let the operators keep the rpms that high in the 15 mph stage, so FAIL is the result.
: : Are there any ways to beat this predicament (desides registering the cars out of state) or are we hosed for good ?
: : Any help is appreciateds
: 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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