All times are UTC - 6 hours [ DST ]




Ask A Question Reply   
Author Message
 

contributions: 6
2002 Buick Century 3.1, 150,000 miles. Had EGR codes P0401 + P0404 back in July, but car run fine + had power. Replaced EGR valve back then. Codes are back on + car lacks power, no get up+go. Pulled throttle body + cleaned out EGR port, Was clogged. Cleared codes. Checked fuel pressure. 52lbs with key on,engine off. Cars still lacks power, eats fuel. Could catalytic converter be clogged + causing this? How do I check it? What else do I check. Did tune up about a year ago.


Share on FacebookShare on DiggShare on DeliciousShare on TechnoratiShare on TumblrShare on Google+
   
Reply with quote  
* Search   
 
User avatar

contributions: 319
Images: 4
Yes, you could have a plugged catalytic converter. They can also set EGR codes. The proper test is to use a back pressure gauge in the oxygen sensor port. But, you can unbolt the exhaust at the rear manifold from under the car, ahead of the converter then see if power and acceleration is restored.

You could also have a faulty MAF sensor. You would need to look at airflow readings of MAF to see if they increase as RPM increases. You can also unplug it when it is running, if it dies- restart it, then see if power is back to normal.

I would also check the fuel pressure regulator. If it was leaking, that would cause the very bad gas mileage, and could be the cause of a plugged catalytic converter.


   
Reply with quote  
 

contributions: 6
Will be disconnecting cat tomorrow to see if that helps. Thanks.


   
Reply with quote  
 
User avatar

contributions: 319
Images: 4
goatman wrote:
Will be disconnecting cat tomorrow to see if that helps. Thanks.

Please let us know what you find.


   
Reply with quote  
Ask A Question Reply   

   Similar Topics   Author   Replies   Views   Most Recent 
New Articles View the first Car Trouble - 99 Buick Century Limited

in Buick

CountryGirl2

1

1684

Tue Feb 03, 2015 8:18 pm

carriedi View the latest

New Articles View the first my 2002 buick lesabre ABS Traction

in Buick

Deniene29

3

1947

Tue Apr 07, 2015 8:24 pm

carriedi View the latest

New Articles View the first 2002 Buick Regal LS ABS light on

in Buick

jcmgmm

2

379

Mon Aug 28, 2017 3:29 am

jcmgmm View the latest

New Articles View the first Attachment(s) 2002 Rendezvous- Shifter slides... Stuck in park.

in Buick

jsand100

3

1912

Sun Feb 21, 2016 9:51 pm

carriedi View the latest

New Articles View the first Attachment(s) my 99 buick lasabre

in Buick

continental67

2

923

Wed Mar 08, 2017 2:09 am

carriedi View the latest

New Articles View the first 99 Buick Regal problems

in Buick

Cooter75

1

885

Wed Oct 19, 2016 10:58 pm

carriedi View the latest

New Articles View the first 2003 Buick Rendezvous over heating

in Buick

TSaldana

1

1870

Tue Feb 16, 2016 3:31 am

carriedi View the latest


All times are UTC - 6 hours [ DST ]



Search for:
Jump to:  
Contact Us