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Failed CA Smog, help reading results.
I went for smog and failed, retested and failed again.
Car is a 94 E420. Replaced Air filters, spark plugs, ignition distributor cap, cleaned egr valve. Results: HC - Failed 15 mph MAX: 77 AVG: 21 MEASURED: 126 25 mph MAX: 42 AVG: 13 MEASURED: 91 CO - Passed 15 mph MAX: .43 AVG: .06 MEASURED: .17 25 mph MAX: .4 AVG: .05 MEASURED: .19 NO - Passed 15 mph MAX: 671 AVG: 150 MEASURED: 469 25 mph MAX: 666 AVG: 136 MEASURED: 422 My HC tests fail by about double the maximum amount. NO is alot higher than the average, but still passes. Any suggestions? Car is from Utah, btw. Need to pass smog. Any advice and help would be appreciated. Engine actually does run very well, has 79k miles on it. |
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is there anyway to check the cat myself?
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I had the same problem with my 1984 380SE but I have double the miles. I went with a after market cat, new muffler as the old one was the original one, and a new resonator as it too was the original one. I passed the smog test but my NO was pretty high, everything else was about half the medium.
Last weekend I had the air/gas mixture set by an Indy and he told me it had been running rich. Wonder if that is the cause of the higher NO? Also the complete job was just $300.00 and change at a local muffler shop. |
If the Catalyst was gutted you wouldn't be that close to passing.
Start with a O2 sensor & re-setting of the adaptation of the fuel computer. |
Yea I was thinking the same about the cat, if it was gutted, my results would have been out of control. I will check out the O2 sensor. Also, what are the chances of my problem being air/fuel mixture? Is the m119 prone to this sort of problem? WHat I am asking is... is it mostly computerized to the point where it cannot really be adjusted?
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No fuel/air ratio adjustment...resetting the self adaptation of the fuel computer should help
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would it be a good chance that the oxygen sensor is bad at 79K miles? just making sure, and do i just restart the fuel computer by disconnecting the battery and reconnecting?
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Adaptation has to be done by dedicated MB scanner.
Have you had the duty cycle checked? O2 sensor readings? |
how much would a scanner cost? i went on ebay and found some 25 dollar scanner/code readers? is that what you were referring to?
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dedicated MB scanner. ;)
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hmm well i smogged the car again after putting in a brand new o2 sensor, still failed the HC
RPM: 512 Max HC: 100 Avg: 17 Measured: 151 RPM:2578 Max HC: 130 Avg: 12 Measured: 125 So I barely passed the hc test at 2578 rpm but failed the test at 512. Any advice? I know the e420 is EFI so there is no adjustments for AFM and since it is EFI it is probably correct since it is controlled by the factory presets. I have checked the spark plugs and they look clean. I don't believe there are misfires... Any advice? Should I replace all the ignition parts? plugs, wires, rotor, distributor etc? those parts come out to be a couple hundred and would rather not replace them if my problem is not a misfire |
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