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Car Forum / Mercedes-Benz Cars / February 2008300E Bad Cat Converter ?
Hi I just had my emissions / smog check here in California and the NOx were really high. Very close to failing. I suspect a bad cat. I measure the temp of the cat with a fluke infrared and measured 245C or 473F. The temperature was the same at the front, middle and back of the cat. The car was running at operating temp, I did this after I came home from work and the water temp was near 100C Shouldn't the reading be closer to 426C or 800F? Ideas? It looks like the original cat , the car has 175,000 miles You got your monies worth out of that cat. You need a new one. Do NOT just weld in a tiny POS cheapo cat. Get a real one WITH the pre-cat. Like this one: http://www.car-stuff.com/carparts/mercedesbenz300e19861989decmb2212c264172.html > Hi > [quoted text clipped - 9 lines] > > Ideas? It looks like the original cat , the car has 175,000 miles thanks for the reply, at first I thought you meant buy a new car. :') I live in California but the car is from the east coast, so I should NOT get the California CAT? how about the catco for $255? http://www.autopartswarehouse.com/details/QQMercedes_BenzQQ300EQQCatcoQQCatalyti c_ConverterQQ19861992QQ9717.html > You got your monies worth out of that cat. You need a new one. > [quoted text clipped - 17 lines] >> >> Ideas? It looks like the original cat , the car has 175,000 miles Why do I not see a cat in that exhaust?? Why does that so-called cat not look like any USA exhaust?? Open your hood and look down where the exhaust bolts to the exhaust manifold. Do you see pre-cats there? Go here and look at the lower exhaust in the picture. That is what you should have. http://www.detali.ru/cat/oem_mb2.asp?TP=1&F=124030%5F501&M=103983%5F505&GA=722%2 E320&GM=717%2E430&VIN=%2A&CT=F&cat=501&SID=49&SGR=060&SGN=02 > thanks for the reply, at first I thought you meant buy a new car. :') > > I live in California but the car is from the east coast, so I should NOT get > the California CAT? > > how about the catco for $255? http://www.autopartswarehouse.com/details/QQMercedes_BenzQQ300EQQCatcoQQCatalyti c_ConverterQQ19861992QQ9717.html > > You got your monies worth out of that cat. You need a new one. > > > > Do NOT just weld in a tiny POS cheapo cat. Get a real one WITH the > > pre-cat. > > Like this one: http://www.car-stuff.com/carparts/mercedesbenz300e19861989decmb2212c264172.html > >> Hi > >> [quoted text clipped - 10 lines] > >> > >> Ideas? It looks like the original cat , the car has 175,000 miles Not so fast mit der schpending off der big bucks Check the EGR valve, either clean or replace, also vacuum lines Peter > Hi > [quoted text clipped - 9 lines] > > Ideas? It looks like the original cat , the car has 175,000 miles You would be surprised at how little a EGR valve lowers NoX. EGR lowers combustion temps to stop the formation of NoX. NoX forms when combustion temps exceed 2500 F. The cat controls about 95% of NoX. > Not so fast mit der schpending off der big bucks > Check the EGR valve, either clean or replace, also vacuum lines [quoted text clipped - 13 lines] > > > > Ideas? It looks like the original cat , the car has 175,000 miles |
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