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#1
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Failed E-Test Twice (1ST:High HC) (2ND:High NO) W140 Ideas???
1992 400SE W140
The above car failed its bi-yearly emissions test a few days ago, the first test failed due to too high of a HC count at the ASM2525 test: ASM2525 TEST HC ppm Limit: 45 Reading: 100 FAIL CO% Limit: 0.25 Reading: 0.08 PASS NO ppm Limit: 315 Reading: 0 PASS RPM: 1800 VALID Dilution 14.8 VALID CURB IDLE TEST HC ppm Limit: 200 Reading: 132 PASS CO% Limit: 1.00 Reading: 0.37 PASS NO ppm N/A RPM: 732 VALID Dilution 14.9 VALID So I did some research & asked around, to find out that the Catalytic Converters on these cars need to be heated up really well. So I ran the car at idle for 10 minutes at 2500RPM, and then let the tech do the test again. The results were completly different, this time failing with a too high NO count at the ASM2525 test: ASM2525 TEST HC ppm Limit: 45 Reading: 5 PASS CO% Limit: 0.25 Reading: 0.00 PASS NO ppm Limit: 315 Reading: 956 FAIL RPM: 1452VALID Dilution 14.3 VALID CURB IDLE TEST HC ppm Limit: 200 Reading: 4 PASS CO% Limit: 1.00 Reading: 0.00 PASS NO ppm N/A RPM: 660 VALID Dilution 15.0 VALID Can anyone offer any input or suggestions as to where to start trouble shooting? As you may know, this car does not have the check engine light. Thanks |
#2
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Idled to long (engine too hot) & EGR wasn't working properly.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
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