gmc forums   gmc forums
Go Back   GMC Forums > GMC Vehicles No Longer In Production > GMC Envoy Forum

GMC Envoy Forum Forum for discussions regarding the GMC Envoy


ATTENTION: We're looking for moderators. Is anyone interested?
GMC Forum: 2004 Envoy
Reply
 
Thread Tools
  #1  
Old 11-08-2010, 08:26 PM
MRod MRod is offline
Junior Member
 
Join Date: Nov 2010
Posts: 1
Default 2004 Envoy

When the vehicle idles, the oil pressure drops to zero. The check gauges light also is coming on and so is the check engine light. Anyone have any idea what might be causing this. I've checked the oil and its fine.
Reply With Quote

  #2  
Old 11-08-2010, 11:39 PM
Molson02536 Molson02536 is offline
Senior Member
 
Join Date: Dec 2009
Location: K/W Ontario Canada
Posts: 3,095
Send a message via AIM to Molson02536 Send a message via Yahoo to Molson02536
Cool

Quote:
Originally Posted by MRod View Post
When the vehicle idles, the oil pressure drops to zero. The check gauges light also is coming on and so is the check engine light. Anyone have any idea what might be causing this. I've checked the oil and its fine.
Could be a bad oil pump, but most likely it's going to be a bad oil pressure sending unit. For the 4.2L I-6 engine, the oil pressure sending unit is just right next to the oil filter, the only tool you have to purchase is the long 1 1/16 inch socket, which is made for installing/removing oil pressure sending unit.

Without it, it would be difficult to torque it down. I guess that is the main reason for the thing to come loose in most Envoy's and Trailblazers. The oil pressure sending unit part # 12611588, look into the oil filter area and change the sender unit. Just disconnect the electrical connector and your good to replace the Sending unit.

Good luck and keep us posted and to be safe. Have a mechanical oil pressure gauge check the actual oil pressure.

Be careful about assuming that your oil pressure gauge is showing you any information about the health of your engine. All that it really tells you is that your oil pressure is something above a specified level (a value I couldn't find in the manual but the minimum acceptable oil pressure is specified as 12 psi so it is probably a value below 12 psi)

GM's description is that the oil pressure is monitored by a 3-way switch, It will signal the PCM @ 0psi, 40psi, & 80psi and all readings in between are calculations made by the PCM using this information and other inputs based on a pre-determined set of conditions programed into the PCM
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 10:56 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
gmcowners.com recognizes that "GMC", 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. gmcowners.com is not affiliated in any way with the General Motors Corporation, GMC 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. 2014 Madison Ross Media Group. All rights reserved. Content published on GMCOwners.com requires permission for reprint.
MADISON ROSS MEDIA GROUP MARKETPLACE
Need products for your GMC Truck? Check out your options at the links below:

No special deals available at this time...