Posted 20 December 2011 - 04:10 PM
This morning I was on a steep grassy incline and suddenly the low oil pressure indicators came on.The oil pressure gauge would fluctuate around 40 based on the RPM then suddenly drop down around 0. Prior to that occurrence, the vehicle was facing front down on a driveway which rarely happens. (not steep at all) Normally, the front is elevated. When I started the engine it had the momentarily engine clicking which it has done in cold weather. However, that noise was momentarily. I drove approximately 2 miles to the steep grassy incline when the problem first occurred.
After the first indicator I moved the vehicle to level ground and evaluated the condition. The engine was indeed low on oil. I added 1 Qt and re-evaluated. The issue seemed to go away. However, after driving back the 2 miles the problem recurred. Through out all of this the ENGINE NEVER made a ticking noise as if it were low on oil.
DEALER REPLACED THE OIL PRESSURE SENSOR $368
Yesterday I took my Sierra into the dealer and he ran the codes.
Some of these codes are NOT related. However, just for the total picture I will post them also.
P0 Code - Dealers comments
P0521 - Oil PSI Sensor
P0449 - Vent Solenoid
P0442 - Smell (have no idea what smell means)
P0446 - PSI Sensor
P0335 - Crank Sensor
The check engine light was already on because of the fuel tank leak/Fuel cap leaking etc..
I did not have the money to have him repair every issue. I believe I can save a lot of money doing some of these myself.
I did have them fix the issues related to the Oil System. (No chances taken).
They repaired the Oil Pressure sensor.
Approximately 75 miles down the road the problem recurred. As I was pulling off the interstate and the RPM's dropped I noticed the Oil Pressure gauge drop down to around 15 psi. just as I was stopping the warning's came on again to "Stop the Engine" because there was NO oil pressure.
I can tell when the engine is low on oil as the lifters/valves etc.. start ticking/rattling. There was NO sign the engine was in any danger. As I drove the next 150 miles getting home the oil pressure would fluctuate. When the sensors would indicate a pressure drop the the alarms would sound and the lights start flashing. I could get a temporary relief from the issue by turning the engine off and restarting. Today the issue has occurred just one time. However, I have noticed that the Oil pressure is dropping down around the 15 psi mark. Also, moment ago i heard two sounds that sounded like a "back fire" up into a Carburetor. (Air popping noise) on the 2nd pop the Traction Control error came on the truck felt like it was in 4 cylinder mode. This lasted for maybe 1 mile when the truck starting driving normal again.
Any ideas on this issue?
Posted 20 December 2011 - 04:52 PM
Posted 20 December 2011 - 10:17 PM
Retrax Rolling Tonneau, Putco SS/Chrome Side Rails, Bushwacker Bed Rail Protectors,Husky Floor Liners
Posted 20 December 2011 - 10:33 PM
Posted 20 December 2011 - 11:48 PM
When we came down I found the first level spot and shut it down and checkecd the oil. It was low so I put a Qt in. (I dont know why but there was one in my Hunting gear trunk) After this the level was fine and I continued. Initially it was fine, but a short bit later it started again. Now we are at home and we checked the oil level again and it took another Qt at that time. This was very little driving in between the Qts.
For now lets forget all the other codes. My check engine light always came on. I assumed it was a gas cap and never had it checked.
Based on that I would say yes, it did consume some oil. I get it changed at Valvoline Instant. I think I use the 5W30 Durablend oil. I have no idea what filter they use.
Posted 21 December 2011 - 12:13 AM
I'm here all week ,try the Veal !!
Posted 21 December 2011 - 12:22 AM
Posted 21 December 2011 - 12:58 AM
Man fears what he does not understand- Anton LaVey
Old People Drive Slow To Make The Most Of The Time They Have Left
Member of the Red Truck Club
Proud Vortec Owner
Posted 21 December 2011 - 09:19 AM
Posted 21 December 2011 - 09:30 AM
Edited by ChevyTech77, 21 December 2011 - 09:31 AM.
Every screw up is an opportunity not to make another one.
Posted 21 December 2011 - 01:56 PM
Posted 21 December 2011 - 01:58 PM
Edited by ChevyTech77, 21 December 2011 - 01:58 PM.
Every screw up is an opportunity not to make another one.
Posted 21 December 2011 - 06:13 PM
Posted 21 December 2011 - 08:21 PM
I got a call from the dealer that did the work on Monday. As it turns out, the service manager is a friend of mine from High School. He told me that there is a problem with these engines that require oil to be shot/squirted into the bottom of the cylinders etc...etc... yada yada yada.
Anyway, there is a service bulletin for these engines that have fluctuating oil pressure that requires a kit be installed. In some cases the kit is not enough and new pistons and rings are required. It sounds like GM did not do their home work with their reliability testing. I am sure we can find the service bulletin on the net some where. The Service Manager said that they would refund all the work that was done replacing the oil sending unit.
After talking to him, I took my truck by the local GMC dealer and explained the long list and details of the failure mode. We made an appointment for the tomorrow to bring the truck in. As I was driving there the truck started running really rough. However, it was a "good" rough. If that makes sense. It never came close to stalling, it was just rough. The skid control lights came on again. The service guy told me that when something goes wrong, many times the vehicle will switch into a "safe mode". It shuts down many of the "systems" and allows the driver to reach safety and not get stalled. The skid control system was simply turned off therefore the indicators gave a warning. The check engine light was blinking at this point. He told me that a blinking check engine light is bad and we should not drive it. As I pulled out to go home the condition came back so I turned around and went back. He gave me a loaner and they will look at it tomorrow.
Update you tomorrow.
Posted 21 December 2011 - 08:36 PM
Also tagged with one or more of these keywords: 2009, oil pressure, 5.3
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