P0420- 1 way of checking exhaust - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Lounge For casual talk about things unrelated to General Motors. In other words, off-topic stuff. And anything else that does not fit Section Description.

Reply
 
 
 
Thread Tools Search this Thread
Old 09-17-2014, 09:34 PM   #1
Senior Member
Posts like a Turbo
Thread Starter
 
shawn_s's Avatar
 
Join Date: Jun 2014
Location: Madison Wi.
Posts: 267
Thanked 42 Times in 32 Posts
shawn_s has a spectacular aura aboutshawn_s has a spectacular aura aboutshawn_s has a spectacular aura about
Default P0420- 1 way of checking exhaust

Today i had the idea to find a problem on a buddys car, he has a P0420 code of course just recently had a new cat installed and a resonator.. We replaced the O2 sensors and problem still there.. Then it dawned on me.. "He had exaust wrk done and then the codes came." So i connected the exhaust port of my shop vac to the tail pipe.. And felt around the welds.. And what do ya kno, it was air leaking like crazy at the cat welds!
Cleared the codes.. And went for a drive... After 25 mins we declared it fixed! As before after pulling off a minute or 2 later it would flag
shawn_s is offline   Reply With Quote
The Following User Says Thank You to shawn_s For This Useful Post:
GunsOfNavarone (09-27-2014)
Old 09-18-2014, 09:00 AM   #2
Senior Member

True Car Nut
 
2kg4u's Avatar
 
Join Date: Sep 2006
Location: Windsor, Ontario / Detroit, Michigan
Posts: 4,804
Thanked 220 Times in 181 Posts
2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of
Default

You have to be very careful checking your exhaust system that way. I did that once on one of my cars and sucked the spark plugs right out the exhaust and into the vacuum cleaner. Mind you that method is better than the other way I tried ... kept burning my lips on the exhaust pipe.
2kg4u is offline   Reply With Quote
Old 09-18-2014, 08:12 PM   #3
Senior Administrator








Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,649
Thanked 1,001 Times in 777 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

Roy, you got beer to clean up over here. I got a good chuckle out of that one.
Mike is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1998 Random cylinder misfires and code P0420 jllracer55 1992-1999 0 10-07-2008 12:41 PM
Chevrolet Impala - P0420 petraman Chevrolet 12 02-20-2008 01:08 AM
P0420 - Help please. jseklund 2000-2005 3 06-02-2007 01:53 AM
Great, another SES Light, P0420 jseklund 2000-2005 3 04-06-2006 07:50 PM
P0420 Catalyst System Low Efficiency marksssei 1992-1999 5 11-28-2005 01:23 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 01:31 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.