Question about 2005 GMC Sierra

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Loss of oil/oil pressure and fluctuating oil pressure

Oil pressure dropped dramataclly- added 1 qt - next day warmed engine, smelled burning smell and pressure fluctuates when you step on gas. have seen no oil puddles as yet

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  • Jeremy Lamb May 11, 2010

    the oil pump may be going bad or the oil sender is not workin right start with the sender

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  • 46 Answers

Could be that the screen in the oil pan where the oil is taken up is clogged. not certain--maybe oil change?

Posted on Mar 02, 2009

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What is causing


There is a possibility that you have a bad oil leak some where. Check valve covers, oil pan Etc, Good-Day! The sound you hear from engine, is because there is little oil getting to the tappets on engine for the valves. Sounds like the oil is running down on hot exhaust manifold, and smoking.That is the smell. Have it checked by a mechanic to find cause. Of oil leak!

Aug 13, 2014 | Cars & Trucks

1 Answer

Will not start after warm-up


Try putting a fuel pressure gauge on the injector fuel rail. Start the engine then turn it off, the pressure should hold steady not drop to zero. If it drops you have a bad injector leaking fuel into the engine. Also smell the oil to see if it smells like gas.

Dec 14, 2013 | 2002 Chevrolet TrailBlazer

2 Answers

My oil pressure is 20 at idle and sometimes drops to 0. It stays at 40 while driving and it runs fine, no loss of power, Oil level is fine, no knocking noises.


Chances are that the sending unit has a problem. Could also be a loose wire on it. Only way to test is to put a mechanical gauge on the engine and read actual pressure, or, just replace the sender and see if it helps. No noises from the engine is a good sign. If you had any tapping or knocking, putting a mechanical gauge on there would pretty much be mandatory.

Apr 03, 2011 | 1996 Jeep Grand Cherokee

1 Answer

In the last month car has had three occurances where it runs rough and rumbles. When it happens the car smells like maybe something burning or rotten egg. The temp gauge has been fluctuating at 150,...


Is it a sweet smell or a burnt oil smell? If you are having fluctuation water temps then I would look into the cooling system. That would not explain running rough though. Check your plugs, wires coil pack and fuel pressure.

Nov 20, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

Fuel smell in oil, and also burns aprox. 1 qt. of oil in 300 miles of use. Just had the engine rebuilt due to valve clatter,smoking on acceleration and start-up


Intake, combustion, exhaust system is supposed to be separate from lubrication system. You have a breakdown somewhere in that separation evidenced by gas smell in oil and oil coming through exhaust. Possibly head gasket or piston ring. Take it back to the folks who rebuilt it and ask them about it.

Jun 14, 2010 | 1999 Suzuki Grand Vitara

1 Answer

Valve train noise, engine oil loss, no leak


It is burning the oil,and it is not noticable ,and the oil pump is either weak,or the cam/crank,rod bearings are worn,and the pressure does not make it up yo the valve train.

Jan 16, 2010 | 2003 Nissan Xterra

1 Answer

2000 Tundra 4.7L oil pressure fluctuation


Any smoke from the back end? Did you check the oil level? Have you added oil recently? Its possible it might have been over filled. (which can be worse than underfilled) Also, open the radiator cap and check for white gunge. If its there you have a blown oil seal somewhere which is leaking into the coolant. Obviously, also check to see if you enough oil in there first.

Jan 06, 2010 | 2000 Toyota Tundra

4 Answers

Burning smell under the hood and light came on saying coolant low refill, had it refilled and that is when I smelled burning smell


It could just be the smell of anti-freeze that was spilled onto the exhaust or is sitting in one of the many little "pool"s on the top of the motor. Does it have a sickeningly sweet smell - like molasses? If so, that is most likely the problem . You can try hosing (very light pressure here!) off the engine compartment to rinse off any that has spilled. If you do this and still have this problem - I would check for leaks - both while the car has been running for 10 minutes or so, and also AFTER it has been shut off after running for the same amount of time.

Hope this helps!
KC GTO Dad

Sep 18, 2009 | Saab 9 5 Cars & Trucks

1 Answer

Automatik trans speed works some times, the engine is ok


That can be something wrong with the oil , how long time since you change oil and filter on the transmisjon. A other fault could bee the clutch ore brake band inside the transmisjon. If you smell at the oil , when you tacke up the oil stick , the color on the oil shall bee red , if the color been brown and the smell are smell of burning , the are something wrong with the clutch.

Nov 18, 2008 | 2001 Mercedes-Benz C-Class

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