Post LIM / UIM job troubleshooting ? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 02-13-2008, 01:50 PM   #1
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Feb 2008
Posts: 41
Thanks: 0
Thanked 0 Times in 0 Posts
rkpatt is on a distinguished road
Default Post LIM / UIM job troubleshooting ?

I replaced the LIM and UIM have driven the car for a few days ( about 150 miles ) with no apparent problems . ( see http://www.bonnevilleclub.com/forum/...=asc&start=20_) However, the check engine light came on today . I stopped by Autozone and had them read the trouble code . The code was P0401 - "The PCM has determined that there is insufficient flow in the exhaust gas recirculation system " . I immediately thought of a misaligned "stove pipe" in the new Dorman UIM but I was extremely careful in tapping it down flush with the surface of the UIM and making sure it was running perpendicular . What is the best way to troubleshoot this problem. Is it ok do drive the car like this for a week if need to R&R the UIM ? - Thanks
rkpatt is offline   Reply With Quote
Old 02-13-2008, 03:43 PM   #2
Senior Member
True Car Nut
 
Join Date: Mar 2004
Location: Ames, Iowa
Posts: 3,066
Thanks: 0
Thanked 1 Time in 1 Post
bill buttermore is on a distinguished road
Default

Please edit your profile to add a signature to your posts that includes the year and trim level of your car. That will help us to help you more easily.

No one has yet reported a problem with reduced diameter stovepipes restricting flow in the EGR system. More likely, the EGR valve is plugged up and needs a good cleaning. Another thing that can happen after LIM work is the corrugated stainless tube carrying exhaust gas from the EGR to the LIM can crack and leak, but it doesn't seem like that should cause a restricted flow code to set. Was the EGR passage in the LIM clear before you drove in the new stovepipe?
bill buttermore is offline   Reply With Quote
Old 02-13-2008, 03:59 PM   #3
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Feb 2008
Posts: 41
Thanks: 0
Thanked 0 Times in 0 Posts
rkpatt is on a distinguished road
Default

I was thinking about cleaning EGR cleaning and checking the tube to the UIM first. I guess that might be the most logical step in determining the problem . Those 2 bolts look pretty rusty and I am concerned about the risk of them breaking ( does it often happen ?) . Got a link to the EGR cleaning procedure here ?

I did not notice any restriction in LIM when I installed the stovepipe in the LIM .

Is it OK to drive the car like this for a while ?

Any other suggestions or recommendations are appreciated .

- Thanks

Quote:
Originally Posted by bill buttermore
Please edit your profile to add a signature to your posts that includes the year and trim level of your car. That will help us to help you more easily.

No one has yet reported a problem with reduced diameter stovepipes restricting flow in the EGR system. More likely, the EGR valve is plugged up and needs a good cleaning. Another thing that can happen after LIM work is the corrugated stainless tube carrying exhaust gas from the EGR to the LIM can crack and leak, but it doesn't seem like that should cause a restricted flow code to set. Was the EGR passage in the LIM clear before you drove in the new stovepipe?
rkpatt is offline   Reply With Quote
Old 02-13-2008, 04:14 PM   #4
Senior Member
True Car Nut
 
Join Date: Mar 2004
Location: Ames, Iowa
Posts: 3,066
Thanks: 0
Thanked 1 Time in 1 Post
bill buttermore is on a distinguished road
Default

Use some PB penetrating oil or Sea-foam deep creep to loosen the rust. Use the search feature at the top of the page to learn about cleaning the EGR valve, pintle and passages. It is not rocket science, but it is an expensive part.
bill buttermore is offline   Reply With Quote
Old 02-13-2008, 07:04 PM   #5
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Feb 2008
Posts: 41
Thanks: 0
Thanked 0 Times in 0 Posts
rkpatt is on a distinguished road
Default

You aren't kidding . The valve is like $ 155-175 from the chain auto parts stores. I hope that those rust breaking penetrants work as they are hyped up to be ( basically just a combination of solverts and reatly don't understant how they can dissolve rust.)

Quote:
Originally Posted by bill buttermore
Use some PB penetrating oil or Sea-foam deep creep to loosen the rust. Use the search feature at the top of the page to learn about cleaning the EGR valve, pintle and passages. It is not rocket science, but it is an expensive part.
rkpatt is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
PICS FROM UIM/LIM JOB NOT FOR DIAL UP lunchboxx General GM Chat 9 02-07-2008 06:16 PM
UIM and LIM replaced now leaking coolant out of UIM gasket Paul1981 2000-2005 10 12-21-2007 11:05 PM
Regular "miss" in idle after UIM/LIM job Must_Wrench 1992-1999 38 08-25-2007 11:16 PM
More problems after UIM/LIM job greg_m 1992-1999 18 12-06-2006 01:24 AM
98 SE runs sweetly after UIM/LIM job (oops-engine codes) Slug 1992-1999 17 10-13-2006 02:37 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 10:20 PM.


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.