Question about 1999 GMC Safari

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99 gmc safari tic toc just like a clock when warm and idleing

Oil pressure is high when cold stared

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Posted on Jan 02, 2017

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SOURCE: low oil when engine warms up gmc sierra 1995

30-40 psi of oil pressure is fine for many vehicles including your GMC. I am assuming that the truck has more than 100,000 miles on it and still has the original engine in it. By rule of thumb you only need 10 psi per 1000 rpms in a typical street driven engine to give adequate oil pressure to keep the bearings from oil starvation. The oil pressure is typically higher when initial start up occurs because it is more viscous due to the temperature of the oil as the engines oil warms up the visconsity thins out and the oil flows more smoothly. The drop in oil pressure is a normal occurance. Above 45 is more than required for a daily driven street engine. I believe that the specs on that engine only list 30- 45 psi.

Posted on Dec 07, 2008

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SOURCE: 2004 GMC Sierra High Oil Pressure

if it is electrical oil pressure sensor I would start there. The best way to see if you have a major problem is to use a mechanical oil pressure tester. Take off the oil pressure sensor and put the mechanical tester on. The tester should come with a Gage. If it comes within your trucks oil pressure range than all is fine and replace the sending unit and see if that don't help your problem.If the tester runs high then the oil pump is bad or your cam-bearings could be the problem. But with cam-bearings you would usually get a low reading.

Posted on Mar 14, 2009

  • 14 Answers

SOURCE: 1992 gmc chevy 350 wont idle when warm

This could be a number of things but i think that your problem sounds like a vacuum leak or an EGR problem. Try listening for leaks and try un-plugging the EGR solenoid valve one time.

Posted on Apr 17, 2009

greg_margo
  • 1959 Answers

SOURCE: 2003 GMC Envoy - High Oil Pressure Reading

Sounds like an oil pressure sensor. Here is a diagram to locate it for removal. Best of luck.
Greg

http://www.chiltonlibrary.com/content/images/21202/images/21202_GDIA_g518.pdf

Posted on May 18, 2009

  • 59 Answers

SOURCE: low oil pressure 93 GMC P/U w/350 motor w/205,000 miles gauge

While engine is running, open the cover where you add oil to engine and see if you see a good flow of oil, if good flow, could be as easy as replacing oil sending sensor. got to realize that if poor maintenance history your engine may not be building enough pressure at iddle to move your hydraulic operated valves, only when you rev it up it will pump enough to run smooth. if running engine too long, you may cause more damage to other engine components such as crankshaft and cam shaft bearings. if you can spare a few bucks, have a good mechanic check your oil pressure with a mechanical gauge. another cheap option is to replace oil pump. last resort if you love your truck as much as we do,replace engine or rebuild it. At 205,000 this is a normal symptom, other than timing chain problems, most engines don't make it that far. hope this helps!

Posted on Mar 01, 2010

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2 Answers

Why is steering hard at idle on GMC safari


This is common for these. The power steering pump does not move a lot of fluid or have high pressure when at idle.

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WHAT TYPE OF OIL DO I PUT IN MY 1999 GMC SIERRA 6 LITER V8?


5w30 in cold months 10w30 in warm to hot months. High milage if its over 75,000 miles.

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2001 GMC safari engine noise- sounds low, like spun rod bearing. BUT.... seems actually QUIETER under a load. NOISIER at idle. Oil pressure is low at idle. I was trying to do a "relearn...


not a bearing problem as they get noisier under load or rpms , not quieter
oil pressure always drops around 10% of full pressure at idle more if the oil is of low viscosity ( 5w10 or 15) use a mechanic stethoscope to determine noise source at idle

Apr 18, 2017 | 2001 GMC Safari

1 Answer

Will intake gasket leak make the lifters tic when first starting


I dont think and intake gasket will cause lifter noise. It may cause a rough idle and or a miss at idle on cold start up . as the engine warms up the miss or rough idle will decrease . As for the lifter noise this could be cause by the lifter bleeding down or poor oil presure . On your model of engine there is no adjustment on the rocker arms for lifter noise . They are a 0 lash type .

Mar 06, 2011 | 2001 GMC Jimmy

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I have a 94 GMC safari with 295K on it. I let an oil change go a year and thought because it was around town it wouldn't burn much, well I had about a litre of oil left, changed filter and oil and changed...


The loud knock you here is a bering knock.(not good)By letting oil change go so long i would assume you have caused internal damage.And you say your oil pressure is 275 psi should be around 25 to 50 psi .Bering can't last long without oil.

Feb 10, 2011 | 1994 GMC Safari

1 Answer

2001 camaro 3800 eng. when eng is cold oil pressure is high after warms up oil pressure drop very low at idle. why??


When the engine and oil are cold it will show a high pressure because of the viscosity of the oil. When it warms up the oil is thinner. If it doesn't drop below 20-25 psi at warm idle I wouldn't worry about it as that is normal.

Feb 07, 2011 | 2001 Chevrolet Camaro

2 Answers

When car is cold oil pressuer is at 75 lbs when car is warmed uped it drops to 40 lbs (v6 3800) when warmed uped and give it gas it goes up to 60 lbs but when i stop it dropes to 45 lbs why is this please...


When the oil is cold it is thinner or watery and the pump moves more oil as it turns making the pressure go up. As the oil warms up it thickens and the pump moves less oil letting the pressure go down. Increasing the engine speed makes the pump turn faster, therefore it moves more oil and the pressure goes up. Changing oil grades will change the numbers somewhat, for example 10W40 will give you different readings than 5W30. I don't see any problem with the readings you put in your posting. I wouldn't be concerned until the warm idle pressure gets down to about 30 or a little lower. Hope this helps.

Oct 27, 2009 | 2001 Chevrolet Camaro

1 Answer

I have a knocking sound in the engine when I first start it up that goes away after a few minutes. 1998 Ford Windstar with about 116,000.


Is it a low down in the engine toc, toc, toc or a lighter tic, tic , tic sound?
The lower one is quite often the main bearings, rather than pulling the engine to fix it run 10W30 oil in it instead of 5W30 and treat the old lady with respect and don't rev or drive her till the knocking stops. It stops because the oil pressure has build up. If it is the lighter ticking this is the hydraulic lifters, don't worry about it, just do the same. Make sure you don't go longer than about 4000 miles between oil changes. I put Synthetic blend in all my cars and run 5000 miles between changes.
Hope this helps.
Sam

May 12, 2009 | 1998 Ford Windstar

1 Answer

Oil pressure high when engine cold. but fine when engine is warm


It is normal for oil pressure to be higher when the oil is cold. As the oil heats up, it will thin out. Since your oil pump is driven faster with the acceleration of the engine, your pressure will also increase. On a engine up to full temp, your oil pressure will probably be around 20 psi and maybe up to 60 at full load. But on a cold engine, you may see 60 psi at idle. I dont know if your high oil pressure is causing your vehicle to stall, but maybe your running the wrong weight/type of oil for your truck. If you live in a extreme cold area, you may want to look into a block heater to help warm up your engine faster.

Mar 14, 2009 | 2001 Chevrolet S-10

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