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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 5.3L V8 Engine and Drivetrain > Engine Tunes/Mods

Engine Tunes/Mods Performance Engine Tuning/Engine Modifications

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  #11  
Old 12-26-2015, 09:30 PM
HawkeyeC25 HawkeyeC25 is offline
Junior Member
 
2005 Chevy TrailBlazer LT EXT
Silver Mist Metallic 5.3L V8 4X4
Join Date: Nov 2015
Location: Howell, MI
Posts: 6
Again, I know this is an older thread, but I've found out more info on this issue. A lot of people have found that this is caused by the filter under the Oil Pressure Sensor being plugged (this we mentioned above). It's a very cheap part ($5-$10) but I can only find a genuine GM part (no aftermarket). For those that have the issue, I would try this before cracking into the oil pump. I have 154,000 miles on my 05 and I'm going to put a new filter and sensor to see if my issue goes away (much like others, mine only comes on at low engine speed and sometimes after heavy braking). I'll keep people posted if they are interest.
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  #12  
Old 12-26-2015, 10:22 PM
robertgee robertgee is offline
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2006 Chevy TrailBlazer LS
Sandstone Metallic 4.2L I6 4X4
Join Date: Oct 2007
Location: Hendersonville, N.C.
Posts: 672
Quote:
Originally Posted by pauln1 View Post
Well the new oil pump seems to have solved the low oil pressure warning at cold start up. How an oil pump can become worn at such low mileage is beyond belief but maybe it was taxed by the two engine rebuilds. Let's see how soon before something else fails. What I have learned on this rig is that preventive maintenance cannot counteract a poor design and poor quality parts.
Food for thought on this old post ........ 2 engine rebuilds, yet the same oil pump was used ?
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  #13  
Old 12-29-2015, 12:01 AM
HawkeyeC25 HawkeyeC25 is offline
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2005 Chevy TrailBlazer LT EXT
Silver Mist Metallic 5.3L V8 4X4
Join Date: Nov 2015
Location: Howell, MI
Posts: 6
Well, my findings might be delayed... did a fresh oil change with a new wix filter and high mileage full synthetic oil and my oil pressure hasn't dipped below 45psi yet! Maybe the synthetic oil with the additives clean out the screen/filter?? :fingerscrossed:
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  #14  
Old 07-25-2016, 08:44 AM
joe s joe s is offline
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2004 Chevy Trailblazer
Blue 4.2L I6 4X4
Join Date: Mar 2014
Location: CT
Posts: 2
I'm reviving this old post again because my wife's 04 Trailblazer (I6 AWD) has been lighting the oil pressure warning at cold starts. It just turned over 200k miles. I haven't replaced the oil pressure sender yet. I looked for a 'filter' for the oil pressure sender and found these, but not sure if that's what I need, nor where they go. Rockauto calls them oil filter bypass valves, but they appear to have a little filter in them. And why are there two?

Genuine GM Valve Part# 25014612

Genuine GM Valve Part# 25014006

Can anybody provide more details?
Thanks,
Joe
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  #15  
Old 12-30-2016, 09:01 PM
Ramon Bastidas Ramon Bastidas is offline
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2007 Chevrolet TrailBlazer LTZ
Gray 5.3L V8 4X4
Join Date: Dec 2016
Location: Puerto Ordaz Venezuela
Posts: 1
I got the same problem

Quote:
Originally Posted by wcosh View Post
I know this thread is 1 year old (to the day) but I just experienced the same issue.
Low oil pressure warning followed by "shut off engine" in the Display

After reading up on the issue I tried the following
-cleaned the throttle body
-inspected all vacuum connections

The throttle body was pretty clean but had some soot around the butterfly and I cleaned that off.
I put zip straps on all the vacuum connectors to tighten up the connections.

So far, I have gone 2 days without the low pressure warning.

total cost:
45 minutes of my time
.50 worth of TB cleaner
.75 worth of zip straps
But I replaced the the oil pump and a "O" ring and the warning appear again
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  #16  
Old 05-14-2017, 10:46 PM
Harleyh_102 Harleyh_102 is offline
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2006 Chevy TrailBlazer LT EXT
Light Pewter Metallic 5.3L V8 4X4
Join Date: May 2017
Location: Roosevelt, ut
Posts: 1
I have an 06 trailblazer 5.3 had it two months put about 1500 miles on it since i bought out used,
and I was driving into town and i lost all oil pressure, stopped and checked it, wasn't low on oil, started it kept oil pressure for like 10 seconds, then lost it, I have a knocking on the motor. And metal shavings in the oil! They look aluminum, the block is aluminum! Is the motor trashed or is it rebuildable?
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  #17  
Old 11-04-2017, 09:47 PM
Gusvcamp73's Avatar
Gusvcamp73 Gusvcamp73 is offline
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2003 Chevy TrailBlazer LT
Dark blue 5.3L V8 AWD
Join Date: Nov 2017
Location: Dayton, ohio
Posts: 2
I have an 2003 chevy tb 4wd LT and one day my son was driving it and it started knocking loud we did an oil change and put some oil treatment in after the oil change and when i took off the oil fliter it was so thick and black , we had it only month and half bought it from an dealer the engine sound good when we first got it, can someone please tell me what can i do my wife was talking about getting another engine put in
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  #18  
Old 11-04-2017, 10:04 PM
Jewel red 5 Jewel red 5 is offline
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2007 GMC Envoy Denali
Liquid Silver Metallic 5.3L V8 AWD
Join Date: Dec 2012
Location: NJ
Posts: 98
I would try oil changes every 250 to 500 miles see if it cleans out before I drop a motor in it. Don't use a motor flush I was always told. Im not a mechanic but I was told to add little trans fluid like 1/8 of a cup or less to clean up engine deposits. I would wait to see if someone else who is more engine friendly adds their option first before I do it. good luck
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  #19  
Old 02-20-2018, 10:55 AM
Jaybxnyc's Avatar
Jaybxnyc Jaybxnyc is offline
Junior Member
 
2006 GMC Envoy Denali XL
Graphite Metallic 5.3L V8 4X4
Join Date: Jan 2013
Location: DC
Posts: 7
Same issue with my 06 Envoy decided to rebuild engine

Can anyone tell me a good aftermarket brand where I can buy a rebuild kit for my 06 Envoy 5.3 L engine? grateful if you could send me some brands or links on where to purchase and what to look out for.
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  #20  
Old 08-12-2018, 10:54 PM
Jdanyel73 Jdanyel73 is offline
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Join Date: Aug 2018
Posts: 2
So today, about 35 miles from home, my engine light came on and oil pressure gauge was showing low. I have a 2006 GMC Envoy Denali with a V-8. Anyway, I stopped as soon as I could and checked the oil level. It was fine. When I started back up, the oil pressure gauge went to normal, but a few miles up the road, the engine light started flashing. I pulled off interstate into a rest area. When I started the engine again there, it had a clicking sound and bad vibration. I have OnStar so I called them and got it towed to the local dealer. It is sitting there and I guess I’ll find out tomorrow what they say the problem is. I just bought the Envoy in July and I know it has a rebuilt engine. The vehicle has 99214 miles, but the engine significantly less. What could be wrong?
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