Question about 1989 Chevrolet Suburban

1 Answer

Low oil pressure indication in suburban

I have a rebuilt engine in my 1989 Suburban. For the last 15K mile the oil has always indicated around 50PSI at speed and 28-30PSI at idle. I didn't catch the exact moment that it did it but it was within a day of driving. Now the gauge indicates 30PSI at speed and sputters between 0-and 20PSI at idle. Finally settling in at 0. I know there are 3 possibilities: The pump is damaged, The relief valve is stuck or the sending unit is bad. Is there an easy, no cost way to determine which it might be or do the symptoms tell you which it is most likely to be. I was going to spend the money on a new sending unit since it is an original part, but was hoping not to waste $40 if it wasn't bad.

Thanks for your help ahead of time


Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 279 Answers

If your oil pressure actually dropped below 10 psi at idle, your hydraulic lifters would start to collapse. This would cause them to "tick" or "click" at idle. If you are not getting this clicking, change the sending unit.

Posted on Dec 23, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Low oil pressure

Have you checked the oil pressure with a mechanical gauge or are you going by the gauge in the suburban. If you're going by the electric gauge in the suburban I would suggest checking it with a mechanical gauge. If the mechanical gauge confirms the oil pressure is low then you probably have a serious engine problem. If the mechanical gauge indicates normal pressure the O/P sender is probably the culprit.

Apr 20, 2011 | 2004 Chevrolet Suburban

1 Answer

I have a 99 suburban 350 5.7 vortec the engine was just rebuilt and it has 3-5 lbs of oil pressure and drops to zero at ide (mecanical gauge) we replaced the oil pump last night and still has the same...

have you had the gauge tested to do go out of range over time. it could just not read lower readings i would check this before anything else, rule out the gauge having a fault.41 lbs PSI hot and ~55 lbs cold based on the dash gauge should be around these figures plus or minus, could also check vacuum lines for the engine breather. if i remember these also adjust the pressure as well.

Aug 10, 2017 | 1999 Chevrolet Suburban

1 Answer

Engine oil low light message comes on every 3000 miles and is always quart or more low 2007 chevy suburban 1500

Hard acceleration will burn more oil, also the 5.3l V8s are well known burning oil. so just check the oil every time you fiil up with fuel. Seriously, your already waiting for the tank to fill so grab a towel and check the oil level- if its low put a bit in. Trust me, you dont want to have to replace that engine just because you didnt want to pop the hood!

Jan 19, 2011 | 2007 Chevrolet Suburban Three-Quarter-Ton...

1 Answer


swap your motor and cash for a rebuilt, install it. if your oil pressure is low, engine is worn out.

Dec 13, 2010 | 1997 Chevrolet Suburban

1 Answer

Oil presure guage jumps from 30 to 60 whats the normal operating range

Oil pressure should be around 30 at idle and then sit at 60 when engine is above 2,000 RPM. If pressure varies at all engine speeds it indicates a sticking pressure relief valve which is located within the oil pump. You could try using some oil flushing product in the engine oil before the next oil change to see if it removes the gunk that is causing the valve to stick. If that does not improve it you should see a mechanic about replacing the relief valve.

Sep 29, 2010 | 1993 GMC Suburban

1 Answer

My 1989 350 suburban show the oil pressure maxed above 60 on the gauge. this occurred at the same time as a leak occurred in the intake manifold releasing a small amount of water into the oil. I have...

sometimes you can get a little water trapped. you can try removing the sending unit and cleaning it. you will probably have to replace the unit. the pressure is acceptable though as long as youre not pourong oil out through the seals.

Feb 21, 2010 | 1989 Chevrolet Suburban

1 Answer

Suburban low pressure from fuel pump

Try checking the fuel filter and then the pressure regulator on the rail. If the pressure regulator is bad it will not let the pump push enough pressure. And if the filter is clogged then it will also not let the engine get enought pressure. I have seen pumps starter going out by losing pressure. I have also seen aftermarket pumps quit after about a week unles you did not change the whole assembly.

Sep 27, 2009 | 1999 Chevrolet Suburban

2 Answers

Low oil pressure on 2001 Suburban

your oil sensor comes on at less than ten psi, you may have internal engine damage how many miles on engine, any gum up inside engine, you can try to put on a high pressure high volume melling oil pump to try to help for the time being, but you may need to have it torn and repaired.

Aug 03, 2009 | 2003 Chevrolet Suburban 1500

2 Answers

2002 Suburban needs tune up....

Inspect Brakes and Traction Control Evaporative Emissions System (E) Inspect all the fuel and vapor lines and the hoses for proper hook-up, routing and condition. Ensure that the purge valve works properly, if equipped. Replace the components as needed. Exhaust Gas Recirculation (E) Fluid - Differential Inspect front/rear axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. Lubricate Steering and Suspension Lubricate the front suspension, ball joints, steering linkage, transmission shift linkage, transfer case shift linkage, parking brake cable guides, and brake front axle. Ball joints should not be lubricated unless their temperature is -12 degrees C (10 degrees F) or higher or they could be damaged. Replace Air Filter Element (E) Engine Oil (E) Change engine oil and filter as indicated by the GM Oil Life System (or every 12 months, whatever occurs first). Reset the indicator. Never drive the vehicle more than 16 000 km (10,000 miles) without and oil and filter change. The system will not detect dust in the oil. If the vehicle is driven in a dusty area, be sure to change the oil every 5 000 km (3,000 miles) or sooner. Fuel Filter (E) Oil Filter, Engine Rotate Tires

Nov 04, 2008 | 2002 Chevrolet Suburban

Not finding what you are looking for?
Cars & Trucks Logo

351 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

77202 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22265 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides