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#1
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95 C220 AZ emissions fail
Car has failed emissions 4 times now 2 times Nox was 2.01 standard is 2.00 latest results HC 0.69 CO 11.07 NOX 2.64 nox is all that fails everytime. Ive ran premium gas, used octane booster, is there
any adjustments like R16/1 or anything I can doto make it pass? Thanks in advance for any help |
#2
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I was struggling with borderline NOX on my 300TE here in AZ too...
Failed twice, got it third time...just about... I plugged the EZL so there was no vacuum advance, then put 4 bottles of ISOheet and gave it a run on the freeway at high RPM's to make sure the cat was RED hot. I checked video cam's at the center to make sure I could drive right in.
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#3
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NOx on the 1995 C220 is all about EGR valve operation. Make sure that the valve is getting vacuum from the switch-over valve.
Also with the engine running, if you supply vacuum to the EGR valve does the engine almost shut-off?
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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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