Question about 2003 GMC Envoy

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Hi,every time i turn on air or heat the car idles up and down then car dies and reads low oil pressure.when heat and air is off car is running fine.Help! Thank You Kim

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Time to have the throttle body cleaned, grime build up in this area prevents the throttle plate from closing completely and causing a lean condition.

Posted on Sep 29, 2010


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Has 358000 miles, just had leaks repaired. Twice since my oil pressure gauge reads no pressure but not all the time? Why

1. Oil Pressure Gauge Not Working You will notice this happens when your oil pressure gauge is not reading, whether the engine is turned off, idle or running. Try to step on the gas to rev up the engine. If the oil pressure gauge still doesn't change its reading, your gauge is busted. It's best to replace it as soon as possible because you won't have any idea if your car is already overheating or not.
2. Oil Pressure Gauge Reading Too Low When your engine is idle, the oil pressure gauge will have a low reading. When the engine starts running or when you're already cruising or on the freeway, your gauge's reading should have increased. If it stays on a low reading, then you now your oil pressure gauge is broken.
3. Oil Pressure Gauge Reading Too High Another common oil pressure gauge problem is when your oil pressure gauge is reading too high when your engine is idle or when it's turned off. Rep

Oct 24, 2015 | 2001 GMC Yukon XL

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2004 Dodge Ram 1500 5.7 4x4 will not stay running. It will turn over and runs really rough with the gas pedal all the way down but wont idle.


Nov 15, 2013 | Cars & Trucks

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At idle the oil pressure light comes on

i would say the car is safe to drive.IF the pressure sensor was working correctly, and your engine was a complete dog, then you would expect there to be some loss of oil pressure, but not 0 to 4bar in a blip of the throttle.given that the oil pressure sensor is a common fault (and it controlls the oil pressure light, it is not a seperate switch), i would say the sensor has a 'dead' spot on it, and a blip of the throttle just sees it outside the dead zone of its reading, and pings back to 4bar (its natural to get a slight rise in oil pressure when higher revs are acheived). 4bar is the right value, its what mine sits at. maybe a tiny bit under (3.95) when the engine is very hot/in traffic the oil pressure is reading just over 4 at all times, dosent go up or when accelerate or down at idle is this normal, used to mercedes W124 where it can register .3 up on idle but when accelerate it should goto max, ie 3 bar Whats the mileage on the car. Sounds like It certainly is suffering from low oil pressure at tickover, but loads of cars do and continue running for thousands of miles. blue/white smoke on start up and that points to valve seals and, yes, the head would have to come off to replace them, but it's normally just blue smoke. White smoke points more to head gasket, but that would be replaced anyway when doing the valves.Bet the engine sounds smooth as silk too
Oil pressure is determined by the rate at which oil flows through the internal combustion engine of a car. Low oil pressure is a real danger for engines, as it indicates that the bearings in an engine have worn, allowing the oil to flow more easily and at a lower pressure. However, high oil pressure is generally not a concern for motorists. Oil pressure fluctuates with the heat of a machine, and though high oil pressure can indicate a serious problem, it generally means the engine is in an adjustment period.Oil Pressure at Idle For many cars, oil pressure is much higher upon start-up or while idling. The reason for this has to do with the temperature of the engine. When an engine has been sitting turned off, it cools down, as does the oil that flows through the machine. Upon start-up, the engine temperature begins to rise. As it rises, so to must the oil heat up to find a level pressure to flow through the machine. Cooled oil is thicker, causing it to flow more slowly and at a higher pressure through the machine, until it reaches its optimal operating temperature.Pressure Relief Valve Recurrent high oil pressure, even after the machine has been running for a while, can indicate a problem with the pressure relief valve. The pressure relief valve is responsible for regulating oil pressure throughout the internal combustion engine. It is a safety device intended to keep vessels or piping from experiencing extreme pressure. When this device is malfunctioning, it will cause high oil pressure in an automobile.Types of Oil The type of oil put into an engine can also account for extremes in oil pressure. Low-weight or thin oils will operate with low oil pressure, as they will pass through the machine quite easily. Thicker oil will pass through the machine at higher oil pressure readings. Generally, after an oil change, when fresh oil is introduced into the machine, oil pressure will increase. This, however, is only a sign that the oil that formerly operated your car was too thin for optimal performance.

Oct 19, 2011 | 1995 Jaguar XJ6

1 Answer

97 plymouth breeze 2.4 never no problems until driving oil light came on idle was rough went to turn it died,we put few quarts oil in it it started up drove a couple miles it died again.down for a month...

take compression test
if it has fuel and spark and timming is good
compression could be low do to low oil level at one time
if commpression low need to rebuild or replace engine

Apr 08, 2011 | Plymouth Breeze Cars & Trucks

1 Answer

After 15 miles of running, the oil light will come on.? I have already change my oil and the level its at. in park it will feel like its dying or something.. Could this be a oil pressure sensor?

If the idle speed drops to a low enough point when the oil is hot, then the oil pressure light will come on because the oil pump, which is driven by the engine, is not turning fast enough to maintain proper pressure. You'll need to find out why the idle is dropping and almost dying. It could be a bad IAC valve, dirty throttle valve or something like a vacuum leak. It would be helpful if you had a scan tool to monitor IAC (idle air control valve) counts as this is happening as it would help you find the cause. This may be a job for a shop, but don't let them sell you an oil pump until the low idle problem is fixed.

Aug 20, 2010 | 1988 Chevrolet Corsica

1 Answer

Truck runs fine until you turn on a/c or heater. then idle hunts(goes up and down) will sometimes die

Hi: Its sounds almost like you are Low on R-34 Coolant and being low makes your Compresor to your A/C Cycle Al The Time Its Trying to keep up with the Rest of the A/C System,Causing it also sometimes it will die.You Have a Pressure Sensor that Tells your system when it needs to Run your Compressor to Keep your system running and Cooling Properly.Check or Have your R-34 Frefrigerant Check See if you Need to Recharge Your System.You might whatto let a Garage /Shop do this so they can Vacum your System Down 1st.This Clears all the Air, Refrigerant and Most Commpressor Oil. They will or Should Recharge it with new refrigerant ,Oil, And Bring Your System Back up To Specs.And as Far as it Dying on you off and On. Possibly is really low on R-34 or your Compressor CLUTH is Going Out And Trying to Lock Up. Hope this Helps you Solve your Problem,Let Me Know Please by Voting my Advice i Have Given Your, Thanks Much The WYOCWBOY

May 29, 2010 | 2004 Chevrolet TrailBlazer

2 Answers

Low oil pressure after engine warms up in 94 blazer with 4.3

I have a 99 blazer and ever since I have owned it, it reads lower in pressure when idling, but will go up too 40 while driving. This is normal for the vehicle. If the pressure gets real low, and stays low, it means its time for an oil change.

As long as the pressure goes up when you give it gas, it is fine.

Jan 09, 2010 | Chevrolet Blazer Cars & Trucks

1 Answer

Car shuts off when I stop

Try cleaning the two cross wires inside the mass air flow sensor. (use Q-tip and carb cleaner) It is also possible that your oil pressure switch has a low pressure cutoff feature. If the pressure is low at normal idle, it will shut the engine down. Check oil pressure with a mechanical gauge and if it's good change the sending unit. (check to see if voltage flow through switch stops just at shutdown first though)

Oct 13, 2009 | Chevrolet Corsica Cars & Trucks

1 Answer

My car will turn over but then kills right away.low oil pressure

Well when your computer sees that the oil pressure is too low it will shut the fuel pump down as a safety precaution. What could be causing the low oil pressure could be a few things. You could just be low on oil (5 qts is standard on most vehicles), your piston rings could be going bad causing you to lose compression, your head/valve cover gaskets could be breaking down which could cause you to lose compression, and your valves could be covered in carbon build up and not seating completely.  Try this; put a quart of oil in and try running some 44k power enhancer through your engine. If you are still getting the low pressure light it could be a mechanical problem such as your rings, gaskets, Etc.
The high idle could be a number of things. Your Throttle cable could be adjusted a little short, your Engine Coolant Temp sensor could be constantly reading that your engine is cold which would then dump more fuel into your cylinders. Your O2 sensor could be going out therefore constantly reading that there is too much oxygen in your exhaust and telling your computer to dump more fuel into the engine. Its a long shot but you may also have a timing problem.... Good luck and if there is naything else I can help with just let me know...

Mar 12, 2009 | 2004 Ford Taurus

1 Answer

Low Oil Pressure and rough idle

Please understand, all I can offer you are suggestions, since I don't have access to hands on testing. You might first change oil and filter.
If going by the oil pressure guage, low oil pressure can mean worn crankshaft bearings, as the clearance between bearings and crankshaft is what determines oil pressure.
Of course a worn oil pump can cause the same problem.
You might want to connect an external oil pressure guage to the engine to verify the pressure reading.

The rough running at this point would be hard to pin poit.
Because I do not know the extent of the rust, I can suggest that you consider having it undercoated.

Again, I can only make suggestion because you need an absoluate diagnosis.

Nov 27, 2008 | 1986 Alfa Romeo Spider

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