Low Oil Pressure - Stop Engine - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > General

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  #1  
Old 12-26-2012, 06:01 PM
mjouda mjouda is offline
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2002 GMC Envoy SLT
Silver Mist Metallic 4.2L I6 4X4
Join Date: Mar 2009
Location: KSA
Posts: 11
Low Oil Pressure - Stop Engine

Dear Tech and owners , hope you are fine !

i have 2002 Envoy 4WD,Today got a message ( Low Oil Pressure - Stop Engine ) ,
opened the hood , and heard a tapping /Knocking sound that come and go !
Oil Level is within range, no leak.

could it be the Oil pressure sensor ! or as i already hear the tapping it means that i have definitely other issues like ,
- Pump
- clogged Screen

how to figure it our !

it it possible to clean the screen without removing the pan ?
is it easy to change the pump !

Look forward to your nice inputs !

Best Regards
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  #2  
Old 12-27-2012, 10:47 AM
jason12 jason12 is offline
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2003 GMC Envoy SLT
Dark Gray Metallic 4.2L I6 2WD
Join Date: Nov 2006
Location: Philadelphia
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What does the gauge read?
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  #3  
Old 12-27-2012, 03:36 PM
mjouda mjouda is offline
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2002 GMC Envoy SLT
Silver Mist Metallic 4.2L I6 4X4
Join Date: Mar 2009
Location: KSA
Posts: 11
hi jason , actually when this happened it was reading Zero , i stopped the engine and after a while started it again it went to normal but alternating to high when accelerating , i was planning travel but changed my plan , as i heard a knocking / tapping from upper side of the engine .
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Old 12-27-2012, 04:17 PM
jason12 jason12 is offline
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2003 GMC Envoy SLT
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If the oil was changed regularly then the screen is likely clean and not an issue.

The only thing for DIY is to replace the pressure sensor. Other than this I am afraid it is the task for the professionals.
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Old 12-27-2012, 04:44 PM
mjouda mjouda is offline
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2002 GMC Envoy SLT
Silver Mist Metallic 4.2L I6 4X4
Join Date: Mar 2009
Location: KSA
Posts: 11
thanks for your reply , usually changing the oil on 2000 miles , was using Mobil 20W50 this is common in Saudi Arabia ,
i just changed the Oil and oil Filter,and used 10W40 on a hope that thinner oil may somehow help to open clogged screen , not sure it this makes a sense but trying anything before i go for opening the oil pan option which i guess not so easy with 4WD.

now trying to hear the tapping , but is no longer heard at least so far few hours after changing the oil and filter.

was unable to determine the exact location of the Oil pressure sensor , but found some sensors around the filter that the wires was full of oil perhaps due a possible to leaking in the area , cleaned them , blown them with compressed Air.

a free tech advice ! told me not worry about the oil pressure getting high while accelerating ,as their is a bypass valves that reliefs the oil pressure once it got higher than the max. allowable level . at least it indicates that the pump is not the issue .

And asked me to use the car and carefully monitor the gauge and sound for few days !

am about to travel 500 miles but will not trust the engine till i monitor it for .......

however will let you know ! Best Regards
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  #6  
Old 01-01-2013, 10:06 PM
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blackblur blackblur is offline
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2006 GMC Envoy Denali XL
Liquid Silver Metallic 5.3L V8 4X4
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Location: chilliwack, BC
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hey the same just happened to me about an hour ago and i'll be looking in to it in the next week as i dont need the SUV for the next while and my wife can use my truck and i have to fix my brother inlaws titan thing died on him 2 days ago and he needs it fixed before his wifes days off end blah blah blah oh yeah plus my day job :-l
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Old 01-03-2013, 05:26 AM
mjouda mjouda is offline
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2002 GMC Envoy SLT
Silver Mist Metallic 4.2L I6 4X4
Join Date: Mar 2009
Location: KSA
Posts: 11
Dear blackblur , looks you have a lot of fixes to do , in my case have changed the filter since then the gauge is on the middle about / normal , but noticed that it is increasing at higher RPMs . not sure of this is normal !

i came to know that recently fake duplicate filters is being sold to the oil and Tyre repair shops and i usually change oil at those shops not the dealer , so i have to consider buying filters from the dealer to avoid such case ,

my guess is that the Engine oil pump is a not easy to worn part so have to look into other issues before suspecting the pump or considering to change the pump ! Best regards.
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  #8  
Old 02-14-2013, 02:42 AM
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bullguy bullguy is offline
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2007 Chevy TrailBlazer LT
Imperial Blue Metallic 4.2L I6 2WD
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Location: Dammam,Saudi Arabia
Posts: 250
Mjouda,i had this same problem a month back,now a days i don't see any message,by the way try to change your oil in Naft station petromin they are very prof people.
you will get all genuine parts there and once in a while try to do the engine flush,they do it there.
hope this will solve your problem
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