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  #1  
Old 11-10-1999, 10:49 PM
Nick Jamal
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Benzmac:
Since you mentioned precats rattling in the "Zinging" post below, it occured to me to ask - do you think the precats are still doing anything useful in my 86 300E (190000km) - or are they just providing that much more restriction? I've read several times that "gutting" these is worthwhile - is it?
Thanks,
Nick
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  #2  
Old 11-11-1999, 03:20 PM
CMuc's Avatar
mucman
 
Join Date: Jul 1999
Location: Port Coquitlam BC, Can
Posts: 92
I have an 87' 300E with 330,000km on it. I had the exhaust manifolds off and the pre cats were gutted. At first I thought it was great but then I noticed that they were upstream of the o2 sensor. Benzmac, does the computer require these cats to be working properly for a proper fuel map? Thanks.

------------------
Chris Muc
Auto mechanic
'87 300E 330,000 km

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  #3  
Old 11-11-1999, 10:11 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
They did help the O2 to come online quicker because they build up so much heat. They are gutted on my old car too. If the cars burns any oil, they will clog up fast. They have been done away with on the later 300E with the same main cat.

------------------
Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM


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  #4  
Old 11-11-1999, 11:58 PM
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Join Date: Aug 1999
Location: Dalton, Georgia
Posts: 839
Does one remove the catalytic converter or just gut the inside and put it back into place? My 91' 190 is rattling underneath when the engine is revved and my mechanic said they are expensive to replace so I thought I might just do away with it.
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  #5  
Old 11-12-1999, 08:30 AM
Nick Jamal
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Benzmac:
Thanks for he reply!
I would really appreciate some brief instructions re how to gut these things, i.e., what tools to use, etc.
Thanks again,
Nick
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  #6  
Old 11-13-1999, 10:13 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
I have done it to my personal driver, but not ever to a cust. car. I hope you understand I can't tell you how to destruct the emmissions system on your car.


------------------
Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM


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  #7  
Old 04-02-2000, 08:20 PM
altan
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I have just removed the pre cat and the
cat from my 88 190E since it was partially
clogged. The car now is even worst. The
car is hesitate to go, look like to mixture
is too rich and the idleling is rough as well.

What could be wrong ? Do I need to retune
the CO and HC again ? The car run fine if
I disconnect the O2 sensor wire under the
seat but I feel is is less power at high speed. (Probrary it is running lean).

your help will be appreciated.
Thanks
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  #8  
Old 04-02-2000, 10:43 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
Get a new o2 sensor and have lambda checked.

------------------
Benzmac:
Donnie Drummonds
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM
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  #9  
Old 04-03-2000, 08:56 AM
LarryBible
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It's obvious that Benzmac is not in a big hurry to see what the inside of a Federal prison looks like. Can't say that I blame him.

Larry
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  #10  
Old 04-03-2000, 10:46 AM
altan
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Posts: n/a
Thanks Benzmac, BTW, May I know what is
the purpose of the O2 sensor and Will it
cause any harm to the car if I disconnect
it permenantly. ?

p/s, Mr Larry, my country have not enforce
the catalytic requirement and it is damp
expensive to replace over here.

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