Mercedes 300E Emmisions Test

Hello everyone...
Took my 89 300E for the emmisions test today here in NJ and this is what happened... Failed for the parking brake...I have to tighten it...
Failed for the NOx part of the emmisions...came in at "1700" a normal reading is "1146." I have a whole new exaust system and catalytic converter, as well as o2 sensor. I run hi-test fuel in it also. A friend said to pour a lot of dry gas in it to help pass the test... Any help is greatly appreciated- Charlie-NJ
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What is your HC and CO level? You need to lean that fuel mixture out alot more.
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what is 'dry gas' ?
cheers
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Stuff you put in gas to "dry it out"... it binds with the water molecules in gasoline to prevent freezing... I don't think I ever seen frozen gas...yet.
You could google it...
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Was your car thoroughly warmed-up when you took it in for inspection? My '88 260E would not pass unless I took it out and drove it at highway speeds for at least 15 minutes prior to going in for inspection. My mechanic said that the cars were engineered in such a way that they ran really rich until completely warmed up. Once I followed this procedure, I never came close to failing the NOx test again.
BTW - still got the car. Running strong on original engine at 325,000+ miles.
Rick in Raleigh

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Rick,
The Cat and the O2 sensor must warm up to the point where the Cat lows CO2 emissions, and the O2 sensor can read the air/fuel ratio to transmit the proper adjust factor to the ECU. A gas analyzer is absolutly necessary to fine tune the system. After that, i'm sure the car will pass the emissions test like a charm.
RSalles
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