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Oil pressure rises with engine rpm - TrailBlazer EXT Chevrolet Cars & Trucks

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  • Anonymous Feb 20, 2009

    oil pressure rises and falls really low,to hear values tap hard.

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My oil gage is reading 80 whats goin on i have a 2004 chev surban

Posted on Nov 20, 2009

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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.

Jul 06, 2015 | 2003 Ford Expedition

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Low oil pressure


55 is max (pressure relief)
20 is typical hot engine at 800 idle. and rises as RPM rises.
your post tells neither , temp, or RPM

Mar 06, 2014 | 1986 Suzuki Samurai

2 Answers

The oil pressure on my 94 Trooper flucuates from around 10 at an idle up to 55-70 when I'm driving down the road. I changed the oil sending unit when I changed my oil thinking they both might help but I...


This seems pretty normal. So long as the pressure does not fall while driving, you're good.
When Idling there is very little stress on the engine, and it requires little oil pressure to maintain.
Additionally, the pressure is directly related to the rpm of the engine as the oil pump is driven by the engine. As the rpm increase, so does the pressure. The pressure should be stable at a given rpm.

The pressure on the high side is good. On the low side is adequate (idle). You did not say how many miles, but the only way to change this is to rebuild the engine with new bearings and seals. I don't think that's somthing you want to do. Sounds fine for now. Leave it alone.
Don't fall for a new oil pump. That is very rarely the issue.

Feb 07, 2011 | 1994 Isuzu Trooper

2 Answers

Oil preser lowers at lights


Hi there,

That is natural. The oil pressure rises in response to engine rpm's.

Idling at a light? Low oil pressure

55 mph on the highway? Higher oil pressure

Good job keeping an eye on it. And remember to change your oil every 3,000 miles.

Best regards
Mike a6b05ec.gif

Aug 14, 2010 | 2002 Jeep Grand Cherokee

1 Answer

I have a '99 Jeep Grand Cherokee and occasionally the oil gauge falls then rises even though there is plenty of oil in the crankcase. what's going on??


could be a poor connection at the pressure sending unit or a partially obstructed oil pump pickup screen. If internal, often adding marvel oil will help dissolve any carbon or sludge and help with that. Also check the connection at the sender. Can also be the sender itself going bad. Pressure will normally rise and fall with engine rpm but should remain steady if rpms do not change.

Mar 08, 2010 | 1999 Jeep Grand Cherokee

1 Answer

2002 tundra oil pressure fluctuates


Assuming you have made sure your oil level is full, I would replace the oil pressure sending unit. The sending unit is located right next to the oil filter on the lower left side of the engine. If I recall it's right on the filter attachment housing. You'll see the sending wire attached to it.

That is the fastest, cheapest and most likely solution.

Aug 31, 2009 | 2003 Toyota Sequoia

2 Answers

When the engine temperature is cold the oil pressure will climb depending on the RPM's. If I keep the RPM's below 1800, the oil pressure will remain at 3/4. If I go beyond 1800 RPM's with the engine block...


You need to have a mechanical test gauge hooked up to see if this is a false reading, this special gauge goes into the oil sender tap in the block and will let u know for sure if the pressure is to high cold, if it is the most common issues are wrong weight of oil, do u use oil heavier than 10W-30W? any other oil like 10W-40W will cause high oil pressure readings, the reason is the very tight rod and main bearing clearance's the engines now use, it is only about 1/2 the clearance of older engines, that is so the new fuel saving thin oils can be used.

May 13, 2009 | 2000 Jeep Wrangler

1 Answer

Pressure of oil


You probably have a high mileage engine. Change the oil and go to a heavier oil viscosity and use a quality oil filter. This should help a little. If the engine has many miles on it this is about all you can do to boost the oil pressure. I don't know what engine you have. So you have one of two possibles here. A 302, a 351. A high mileage engine in either of these two engine configurations should have at least 20 pounds pressure at an idle and should rise as the engine rpm's increase. Good luck.

Mar 06, 2009 | 1990 Ford F150

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