chevy forums   chevy forums


Go Back   Chevy Forums > General Discussion > General Discussion / Introductions

General Discussion / Introductions The forum lounge. Discuss topics not intended for other areas in the community. This is a great place for introductions...

Chevy Forum: 04 Malibu 3.5l EGR Flow Insufficient
Reply
 
Thread Tools
  #1  
Old 09-29-2019, 11:37 AM
TonyFritz@Hotmail.com TonyFritz@Hotmail.com is offline
Junior Member
 
Join Date: Sep 2019
Posts: 2
Question 04 Malibu 3.5l EGR Flow Insufficient

Hi everyone, looking for some suggestions;
I have a 2004 malibu LT 3.5l and am getting "EGR Flow Insufficient"
I have a new OEM EGR valve and tested all voltages/ground on the harness, the pintle action, and the voltages from the pintle postion sensor. I removed the plenum and cleaned it thoroughly (new gasket) and made sure the EGR venturies are all clean - I have no vacuum leaks. Also have a new exhaust tube and ran the car with the tube out to verify exhaust is flowing through it.
The map sensor is reading 31 to 33Kpa at idle and I'm reading 19hg vacuum at idle.
From what I can find, the ECU is looking for a drop in MAP sensor reading when the EGR is opened but that's about all the information I can find.
Does anyone know if this model is looking for any other information like O2 readings or MAF flow? I have no other codes and have checked over everything several times.

Thanks,
Tony
Reply With Quote

  #2  
Old 09-29-2019, 06:18 PM
zora zora is offline
Administrator
 
Join Date: Apr 2012
Posts: 3,442
Default Re: 04 Malibu 3.5l EGR Flow Insufficient

Only other thing mentioned that you havent done is the differential pressure sensor
https://www.obd-codes.com/p0401
Reply With Quote
  #3  
Old 09-29-2019, 08:35 PM
TonyFritz@Hotmail.com TonyFritz@Hotmail.com is offline
Junior Member
 
Join Date: Sep 2019
Posts: 2
Default Re: 04 Malibu 3.5l EGR Flow Insufficient

on this model the I believe the DPFE sensor is just the EGR valve itself and the pintle is either opened or closed. I tested the pintle opening and closing and also checked the voltages for the pintle position sensor so I'm relatively certain the EGR is good. I also have 2 other EGR valves that I've tested since I have been chasing this issue for so long.
I'm planning on running some wires from the EGR position sensor to a voltage meter and taking it on a drive, according to what I've read the voltages should change over 40mph and then when backing off the throttle - haven't had a chance to do that test yet.
Reply With Quote
  #4  
Old 09-30-2019, 09:35 AM
zora zora is offline
Administrator
 
Join Date: Apr 2012
Posts: 3,442
Default Re: 04 Malibu 3.5l EGR Flow Insufficient

See if this helps, I realize the 3.5 is not listed.
https://easyautodiagnostics.com/gm/3...nostic-tests-1
Reply With Quote
Reply

Thread Tools

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

Forum Jump



All times are GMT -5. The time now is 04:55 AM.


Sponsors




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
chevyforum.org recognizes that "Chevy", "Chevrolet", it's logos and various model names and numbers are registered trademarks of the General Motors Corporation. These terms are used for identification purposes only. chevyforum.org is not affiliated in any way with the General Motors Corporation, Chevy, Chevrolet or any other company listed herein. All information on this site is the opinion of its members and not the opinion of the site itself. 2017 Madison Ross Media Group. All rights reserved. Content published on ChevyForum.org requires permission for reprint.
MADISON ROSS MEDIA GROUP MARKETPLACE
Need products for your Chevy? Check out your options at the links below:

Miss the Chevrolet SS? Believe it or not, Kia may have something for you. The Kia Stinger is a large sport-oriented hatchback sedan in the mold of the Audi A7. The Kia Telluride is a mid-size SUV similar to the BMW X5...