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Next: 300E Expansion tank mounting
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External
Since: Jan 31, 2008
Posts: 57
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(Msg. 1) Posted: Tue Feb 26, 2008 1:51 am
Post subject: 300E Bad Cat Converter ?
Archived from groups: alt>auto>mercedes (more info?)
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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 |
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External
Since: Dec 02, 2003
Posts: 421
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(Msg. 2) Posted: Tue Feb 26, 2008 1:51 am
Post subject: Re: 300E Bad Cat Converter ? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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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
"Tube Audio" wrote in message
> 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
>
> |
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External
Since: Feb 25, 2007
Posts: 12
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(Msg. 3) Posted: Tue Feb 26, 2008 1:51 am
Post subject: Re: 300E Bad Cat Converter ? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Not so fast mit der schpending off der big bucks
Check the EGR valve, either clean or replace, also vacuum lines
Peter
"Tube Audio" wrote in message
> 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
> >> Stay informed about: 300E Bad Cat Converter ? |
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External
Since: Dec 02, 2003
Posts: 421
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(Msg. 4) Posted: Tue Feb 26, 2008 1:51 am
Post subject: Re: 300E Bad Cat Converter ? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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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.
"Peter W. Peternouschek" wrote in message
> Not so fast mit der schpending off der big bucks
> Check the EGR valve, either clean or replace, also vacuum lines
> Peter
>
>
>
> "Tube Audio" wrote in message
>
> > 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
> >
> >> Stay informed about: 300E Bad Cat Converter ? |
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External
Since: Jan 31, 2008
Posts: 57
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(Msg. 5) Posted: Tue Feb 26, 2008 3:20 am
Post subject: Re: 300E Bad Cat Converter ? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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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_BenzQQ300EQQCatco...atalyti
"Karl" wrote in message
> 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
>
>
> "Tube Audio" wrote in message
>
>> 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
>>
>>
>
> >> Stay informed about: 300E Bad Cat Converter ? |
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External
Since: Dec 02, 2003
Posts: 421
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(Msg. 6) Posted: Tue Feb 26, 2008 3:20 am
Post subject: Re: 300E Bad Cat Converter ? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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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%5F50...A=722%2
"Tube Audio" wrote in message
> 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_BenzQQ300EQQCatco...atalyti
>
>
>
>
> "Karl" wrote in message
>
> > 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
> >
> >
> > "Tube Audio" wrote in message
> >
> >> 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
> >>
> >>
> >
> >
>
> >> Stay informed about: 300E Bad Cat Converter ? |
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