Question about 2004 Chevrolet Silverado 1500 Crew Cab

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Check engine light is on. oil pressure is up when

Check engine light is on. oil pressure is up when driving but drops when idleing.

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May have bad oil preasure switch,i would have a garage check oil preasure with a gauge,this way you will know if it a switch or mechanical,

Posted on Sep 30, 2009

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  • Master
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Oil pressure isnt going to cause the Check Engine light. you will need it checked by a shop.

Posted on Sep 30, 2009

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  • Master
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The sender is most likely the problem with the oil pressure. There's only one other question for you, because this can cause a clogged oil pressure sender: Is your silverado losing coolant, but you don't see a leak? There were a bad batch of cylinder heads that were made for GM, and they have a tendency to crack, releasing coolant into the oil. This sludges things up, and can mess with your oil pressure sensor(plugs it). May not be so with yours, but is something to check out.

Posted on Oct 03, 2009

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  • Master
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Go to autozone and they will loan you a OBDII scanner for free. Could be a bad sending unit.

Posted on Sep 30, 2009

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Posted on Jan 02, 2017

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SOURCE: 1999 Chevy Blazer - idle fluctuates

oil pump might be going bad

Posted on Aug 03, 2009

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SOURCE: 2002 trail blazer runs good unil its stopped @

Thank you for being very clear, most of the people on this site write very little or very poorly.

On that note, on to options. It's either (in my expert opinion) an internal engine problem, or your computer/spark plugs needs to be replaced.

Step 1: Get a tune up, (100 bucks) if already done, than I'm proud of you.
Step 2: Go to a mechanic and shell out 50-80 bucks to get a specialized computer hooked up to your car to tell you any and all of the problems with your car.
Step 3: get overcharged by said mechanic to fix it, or do it yourself and grow some chest hair.

Hope it helps.

(excuse the sarcasm, I'm bored at work solving random car problems)

Posted on Dec 12, 2010

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2 Answers

High temp low oil pressure light comes on after driving for a few minutes, then off when engine at driving rpm. At stop light (idle or low rpm) light comes back on. Normal driving it goes out.


You need to find out why you have low oil pressure. It is normal that as engine rpm's increase, the oil pressure will rise- the oil pump is moving oil faster. Even though your light goes out, you could still have critically low oil pressure. There should be sufficient pressure at idle to keep the light off. The light will come on when your oil pressure is almost nil- I believe for some it's as low as 8 psi. Normally, oil pressure at idle is specified anywhere from 15 to 40 psi. You would have to check specifications for your Expedition. To verify oil pressure, hook up a mechanical gauge at the oil pressure sending unit on the engine block. Check with a local shop.

The causes run from easy, simple to budget busting ruin. Low oil level, wrong grade oil, real old oil, oil leaks, internal oil leaks, worn oil pump, worn crankshaft bearings. It was pretty common on older very high mileage cars to have a fluttering oil light at stops and idle. It was time for a rebuild, or time to look for another car.

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00 lincon navigator 5.4 oil pressure drop's low and light comes on , engine idles rough when pressure drops ,then pressure return s to normal range ,light goes out ,engine runs perfect. Is it my oil


Sounds more like an engine idle issue than a oil pressure issue. If the engine idle drops too low, the oil pump cannot provide sufficient oil pressure. If there is no oil light when the engine is idling normally, then there is no problem there.

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Dodge v10 loss oil pressure ownly win idleing


Old engine tend to wear piston ring in time,if you use wrong viscosity grade oil ,during idling the oil could not reach all moving parts because there is no enough oil pressure in the system,try 30/ 40 oil grade .

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Oil Pressure Drops


Did the mechanic drive the truck with a mechanical gauge to check the pressure ? The engine bearings or oil pump could be worn enough to allow pressure to drop at idle after it warms up.

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Losing oil pressure when at idle. pressure is fine when driving


A comparatively quiet engine is often a worn out engine.( Much of the knocking sound in an engine is caused by compression and expansion of gasses, which in a worn out engine is reduced due to leakage of gasses beyond the piston rings or valves.)

You will first have to have the engine pressure tested on each cylinder to ascertain the overall condition.
Usually there are one of two reasons for a low oil pressure warning light or gauge reading.


No.1: The engine is badly worn and oil pressure can leak beyond the piston rings and into the cylinder.


No.2: The oil pump is close to failing or has already failed.


There is also the slight possibility that both of these faults have occurred at the same time.

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Oil pressure light at idle


when the light comes on at idle do you notice any engine noise different from the norm.if not then the oil pressure sensor(ops) is bad/weak and will need to be changed.if you hear abnormal noise with the light on then you will have to have teh oil pressure checked to see if its within specs.

Dec 06, 2011 | 2001 Mazda Tribute

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2001 Jeep Grand Cherokee Laredo approx 147000 miles. Recently notices oil pressures going up to 80psi periodically when driving. If I turned off the engine and restarted it would read normally. Within...


Very first thing you need to do is install a mechanical pressure gauge on there to verify what you see on your gauge. If the actual pressure is low, then it's time to start looking inside the engine. If not, then you need to trace out the electrical problem but will know the engine is safe.

Jan 29, 2011 | 2001 Jeep Grand Cherokee

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Oil pressure drops at idle


If there is no engine noise associated with this ow oil press reading then replace the oil pressure sending unit on the engine, it is defective, this is common on all cars.

Dec 18, 2008 | 2002 Jeep Liberty

2 Answers

Oil pressure light on at idle


Don't delay on this. Take the vehicle in and have the oil pressure sensor checked. It could be just the sensor or it could be something more serious. A drop in oil pressure could lead to catastrophic engine failure.

don

Sep 30, 2008 | 2003 Dodge Neon

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