Question about 1999 Chevrolet Blazer

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Oil pressure my oil pressure dropped suddenly to zero and was leaking oil on the pavement. i still have tons of oil in the engine when i checked the dip stick (even now a day later), but i cannot get my pressure gage to move from around zero. the engine starts and every thing like its fine but i have been overheating lately and have gone through a gallon of engine coolant once a month for the past four months. my fear is that i cracked the engine or something. however when my oil pressure suddenly dropped to zero my engine was not overheated. what do you think bear?

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  • dwmayo Jul 29, 2008

    i figured it out. it was my oil sending unit. its located behind the distributer accessible from the top of the engine. its a pain to get to cause it is in the middle (left to right) and all the way against the fire wall. make sure if you have a v6 1999 blazer with 4wd you get the oil sending unit with one prong in stead of three (nothing worse than finally getting it on and having to take it of and put a different one on). also it will probably help to buy the oil sending unit socket or else you will fight the thing all day. hope this helps someone

  • Anonymous Mar 24, 2014

    Had my 2002 Silverado 5.3 liter idling about 10 minutes when I went in the house. Came out drove it and noticed the oil gauge was at 0. I had only gone 2 miles and the engine quit. Is there a safety feature that prevents that engine from overheating or running without sufficient oil or is it seized up? I noticed that there is oil in the coolant.

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Hi dw,

Excellent descriptions on both the problem and the solution.

Have you considered joining this site as an Expert? I think you'd enjoy the experience.

Regards
Mike258

Posted on Oct 19, 2008

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1 Answer

Oil pressure problem at idle , ok at light throttle


If your problem is that the oil pressure gauge shows zero or very little oil pressure, or if the warning light flashes or remains on, at idle, but pressure returns at light throttle, you need to get your engine checked. Make sure your engine has sufficient oil - reading on dip stick is in the normal range. At idle, your engine is not getting sufficient lubrication. If you have high mileage on your vehicle, the bearings (crankshaft, rod, cam) may be worn. Or you may have impending oil pump failure. Have the oil pressure checked with a direct reading gauge. If you do not get this checked and repaired as necessary, your engine may fail from the lack of lubrication.

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- Park the car on a level floor.
- Check engine oil level on the dip stick and mark it with nail polish. Let it dry. Confirm the oil level. Put the dip stick back.
- Apply about 10 psi external pressure to the coolant system, while keeping caps in place.
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Internal leakage can be determined by checking the engine oil level again.
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- Internal coolant leakage could be due to:-
1. Cylinder head bolts loose or under torqued. (Re-Torque the bolts).
2. Burnt cylinder head gasket. (Always use original spares).
3. Cylinder and head surfaces warped. (Surface grind the cylinder head on surface grinding machine and replace the gasket).
4. Any corroded lid in the cylinder block or cylinder head assembly.
5. Oil cooler, if any.
If the test report of above mentioned procedure is found to be OK, start the engine, pull up dip stick a little, open breather tube from the tappet cover, keep it open and keep the engine start for as long as the water vapors coming out of these points disappear and the engine oil will become clear to its original color.
At times it happens that immediately after replacing the cylinder head gasket some coolant may flow into the engine unavoidably and keep contaminating the engine oil for quite some time.
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