Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

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

LinkBack Thread Tools Display Modes
Old 10-26-2000, 06:40 AM
Posts: n/a
What is the best and least expensive way to check and maybe cleanout the catalytic converter(and pre cats) on my 380? I have been told that these could be the reasons for the slugishness and rough idle.
Is this something I could do myself?
I have a good friend that owns an independent muffler shop. Will he know what to do? What is required to check these items. Maybe someone has had the same problem. Thanks for your help.
Reply With Quote
Old 10-26-2000, 07:01 AM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
There are various methods to determine the usefulness of catalytic convertors. One that lends its self to a non shop setting is this: run the engine at idle and measure the manifold vacuum, then raise the engine speed to 2000rpm (unloaded) and measure the manifold vacuum. The vacuum readings at 2000 should be greater.

I have only done this on good cars as I only read it on iATN last year. I at first doubted that the vacuum would be higher. I was wrong. Catalyst restriction is not a yes or no answer though and I personally am acquiring a data base (experience level) on good engines and then hopefully on some plugged ones as we see them.

I have seen them so plugged that if I could get to 2000 I would have had zero vacuum. I have also seen them so plugged the car wouldn't run.

Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician
Reply With Quote
Old 10-26-2000, 05:31 PM
Ashman's Avatar
Service Advisor
Join Date: Sep 2000
Location: Sherman Oaks, CA
Posts: 4,748
had an 85 190e that the cat became so clogged the car died, restarting it was fine and the car revved fine in neutral, but the moment ya went into a gear and put your foot down, the car would barely move.

Had the cat replaced and it was fine until the tranny went out several months later.

Of course at the time I was much younger and didn't know how to take care of a car....


'92 300CE
Metallic Black (Blue Flaked) on Creme
Clear Corners
Black Grille Insert
78k Miles

Future Upgrades:
Sportline Suspension
17" AMG Monoblocks or EVO II's
94-95 Tail Lights
Euro Headlights
AMG Exhaust

Click here to Go To My 300CE Page
Reply With Quote


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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 07:15 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, 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