High oil pressure - Truck Forums

Thread Tools Search this Thread
Old 04-26-2010, 02:58 PM
Junior Member
Thread Starter
Join Date: Feb 2010
Posts: 7
Exclamation High oil pressure

On my 2005 GMC Z71, the oil pressure gauge is registering 80 psi at all times even when I just turn the key on. Any ideas???
Reply With Quote
Old 04-26-2010, 04:33 PM
HarderThanRocks's Avatar
Senior Member
Join Date: Apr 2007
Location: Chula Vista, CA
Posts: 137

side bar: Why does the majority or the users on here feel the need to denote whether or not their truck has the z71 package?

So your 2005 GMC "Z71" with an ambigious engine has an oil pressure problem?
Relevant information would be helpful unless you have the 1 truck in the world that runs oil to their skid plate and shocks... If that is the case then check your flux capacitor for possible issues...

Ok, ok, ok...

Sounds like there is a restriction somewhere...

I hate to say this but you might need to flush that thing out (flushing can cause more harm than good in some instances). Since you already have a problem. I would do the following:

1. Change oil and filter (go cheap on the oil because you will most likely have to drain it again very soon...), if that fixes it then thats that, if not....

2. Flush your engine.. either with karoseen or berrymans or sea foam, whatever... you might have to do this more than once... do not put any load on your engine while that crap in in your oil.. Just let it idle...

Drain, new filter, new oil. check to see if the problem is fixed.

If the problem is fixed drive the truck for a few days and change the oil and filter again to make sure that none of that flush crap is still in there..

3. Ensure the pressure reliefe valve is working on(in/around?) your oil pump. maybe replace pump if deemed necessary..

4. Drive it till it blows the filter off.. replace filter and spent oil and continue till it happens again..

Good luck...
Reply With Quote
Old 04-26-2010, 05:24 PM
chrisbmo2000's Avatar
General Truck/Classifieds Forum Moderator
Join Date: Jan 2009
Location: Columbia, Mo
Posts: 983

Dont waste your time hunting for a restriction....You have a bad pressure sensor or a shorted wire to the sensor.......
Reply With Quote
Old 04-26-2010, 07:49 PM
chevy112488's Avatar
Senior Member
Join Date: Feb 2007
Location: Jackson, TN
Posts: 985

yep if it reads 80 all day, even with the key on truck off... bad sensor. its not fun to get to.. or it wasn't on my 02 anyway
Reply With Quote
Old 04-26-2010, 11:16 PM
Junior Member
Thread Starter
Join Date: Feb 2010
Posts: 7

My bad, next time I'll say 2005 GMC Sierra Crew Cab 1500 Z71 5.3L V8. Maybe thats more relevant. Thanks for the help.
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
High oil pressure problem pappybarnett New Member Area 4 02-22-2017 09:30 PM
High pressure oil pump problem Brennen beal Ford Heavy Duty 1 09-06-2012 09:21 PM
A/C low side high pressure & high side low pressure ElectroJoe General Motors Tech 1 08-22-2011 04:21 PM
High Oil Pressure Ender06 Chevy Silverado/ GMC Sierra Forum 5 06-09-2008 12:40 PM
high oil pressure chevy112488 Chevy Silverado/ GMC Sierra Forum 4 11-05-2007 10:28 PM

1997, 48, chevy, dodge, f250, gage, guage, high, install, manual, oil, pressure, s10, truck, v8

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

Featured Sponsors
Vendor Directory

All times are GMT -5. The time now is 09:41 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.