Hello, I just got back from the emissions test place for my free test...
(Test 2 of 2.)
I drove the car for 40 minutes before hand, which I thought would be enough to get the cat nice and toasty.


Here are the results from test number 1:

High Speed Results (25mph)
RPM: 1438
HC (ppm): 293 (Standard is 148) FAIL!
CO (%): 7.28 (Standard is 0.94) FAIL!
Nox (ppm): 102 (Standard is 1047) PASS!
Dilution: 17.38 (Standard is >6.0) PASS!

Low Speed Results (15mph)
RPM: 1705
HC (ppm): 284 (Standard is 152) FAIL!
CO (%): 7.35 (Standard is 0.86) FAIL!
Nox (ppm): 98 (Standard is 1146) PASS!
Dilution: 17.55 (Standard is >6.0) PASS!

Overall: FAIL!


Here are the results from test number 2:

High Speed Results (25mph)
RPM: 1433
HC (ppm): 306 (Standard is 148) FAIL!
CO (%): 5.28 (Standard is 0.94) FAIL!
Nox (ppm): 300 (Standard is 1047) PASS!
Dilution: 16.28 (Standard is >6.0) PASS!

Low Speed Results (15mph)
RPM: 1695
HC (ppm): 292 (Standard is 152) FAIL!
CO (%): 5.17 (Standard is 0.86) FAIL!
Nox (ppm): 229 (Standard is 1146) PASS!
Dilution: 16.37 (Standard is >6.0) PASS!

Overall: FAIL!

So my CO improved by 2 full points, HC went up a bit, Nox went up 200ish but is still well within bounds, dilution dropped about 1 pt but again, still within limits...

I am going to double check the duty cycle percentages to make sure the car is still running between 45 and 55% at all times.

My suspects: ignition coil, cap n' rotor, fouled spark plugs due to rich conditions...

__________________
2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)