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#1
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HELP??!! 94 e420 FAILED Emissions : How To Correct??!!
Hello Forum Friends;
My 1994 MB e420 w/238,436 miles FAILED State Emissions Test Today..... Car Runs very good, Smooth idle ; No misses; quick throttle response and No visible/smoke exhaust. Please advise on what the included Emission Test Failure Data Requires me to correct to PASS ..... Test Parameter ... Result .... Additional Information if available Idle Speed CO ... 8.56 % ... GREATER THAN 1.20 % High Speed CO ... 4.40 % ... GREATER THAN 1.20 % Idle Speed HC ... 623 ... GREATER THAN 220 parts per million High Speed HC ... 373 ... GREATER THAN 220 parts per million .....Please Help /Advise on items Needing Attention for a Passing Test THANKS ; In advance for All Replies!!!! Chance |
#2
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Could really be a lot of things. First off, at 238k miles, I'd guess you are still on the original cat? Next time you get it tested make sure you take it on the highway and get it nice and hot. The cat cools down quickly once the car is parked and reduces its efficiency. From then on, it's mostly fuel and timing tuning.
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TC Current stable: - 2004 Mazda RALLYWANKEL - 2007 Saturn sky redline - 2004 Explorer...under surgery. Past: 135i, GTI, 300E, 300SD, 300SD, Stealth |
#3
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The function of the oxygen sensor is the most important thing in smog testing.
If it isn't working then you can get that type of results.
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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 |
#4
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MBdoc do you know the threshold for tripping the CEL for these O2 sensors? Something I was wondering not too long ago with my 300E. I know in other cars I've owned, they trip the CEL quickly (IOW not much variation until it trips the light).
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TC Current stable: - 2004 Mazda RALLYWANKEL - 2007 Saturn sky redline - 2004 Explorer...under surgery. Past: 135i, GTI, 300E, 300SD, 300SD, Stealth |
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