Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 08-14-2002, 11:38 AM
Registered User
 
Join Date: Jun 1999
Location: Surrey, Beautiful British Columbia, Canada
Posts: 750
Real Test for Catalytic Converter

my car, 89 300e failed emission test yesterday
with high amounts of HydroCarbon. my independent
mechanic insists my cat needs to be replaced.

since it is not cheap, is there a real way to test
if it is toast or not? thanks of any help.
Reply With Quote
  #2  
Old 08-14-2002, 01:08 PM
public enemy
Guest
 
Posts: n/a
Just to let you know, when I changed the cat in mine I went to a muffler shop and had them install a generic cat which cost me $150 including installation. It flows more than the stock cat and it costs only a fraction of the price. There is no need to buy an MB cat and spend a fortune.

Aside from that, there is no real test for cat that I am aware of.
Reply With Quote
  #3  
Old 08-14-2002, 02:31 PM
csnow's Avatar
Registered User
 
Join Date: May 2002
Location: Mass
Posts: 1,127
The Cat should be the last resort in solving a high HC Level.
If your mechanic tested everything else, he or she is probably right.
More likely culprits are components that affect:

1)Mixture
2)Timing
3)Spark

The Cat is only there to deal with residual gases from incomplete combustion. Reduce these residual gases, and the Cat has less 'work' to do.
Make sure your car is completely warmed up before testing to give your Cat it's best chance of keeping up.
With some work, the exhaust going into the Cat could be compared to the exhaust coming out to show whether or not it is providing an adequate reduction in HC.

This is a good link on Cats:
http://www.howstuffworks.com/question66.htm
__________________
1986 300E 5-Speed 240k mi.
Reply With Quote
  #4  
Old 08-15-2002, 01:04 AM
Registered User
 
Join Date: Apr 2000
Location: LEMONT-CHICAGO
Posts: 412
a quick test can be done with a digital thermometor like those used in meat packing. In a split second it can be determined if the cat is working if the outlet side is hotter than the inlet side. I have seen it done.
__________________
1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T
Reply With Quote
  #5  
Old 08-15-2002, 02:15 AM
Registered User
 
Join Date: Jun 1999
Location: Surrey, Beautiful British Columbia, Canada
Posts: 750
thanks for all the replies and a good link.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 03:27 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page