Why is my oil pressure so low in my Jeep?

I was beginning to wonder about this, and started to get pretty irritated. i installed a mechanical gauge to be certain it was true. i got p!$$ed the other day and dropped my oil pan (with intentions to put in a High Volume oil pump) and say something shiny by my cam…

What kind of engine does a Jeep Grand Cherokee have?

The 4.7 V8 engine also features a modern coil-on-plug ignition system and a hybrid cooling fan system (in-line electric and engine-driven fans). In 2002, Chrysler introduced a “High-Output” version of the 4.7L PowerTech engine as an option for the Jeep Grand Cherokee Limited and standard for the Overland models.

What’s the problem with 5 lb oil pressure?

FOUND PROBLEM! | Jeep Garage – Jeep Forum 5 lb oil pressure at idle… FOUND PROBLEM! I know, everyone is probably saying “Oh man, not another low oil pressure thread” but this has a solution.

What kind of fuel injection does a Chrysler 4.7L have?

The engine has an electronic fuel injection system (sequential multi-port injection). The fuel injectors are mounted to the intake port in the head. The new tuned-length runner intake manifold is made of polymer material. The engine speed is controlled by an electronic throttle body (fly-by-wire).

What’s the fuel pressure on a Jeep Cherokee?

I purchased a fuel pressure gauge and am reading a constant 45 PSI when it is running. I noticed when I shut the Jeep off, the fuel pressure was quickly dropping off on the gauge. From my understanding the fuel pressure should NOT drop when shutting off the vehicle.

Can a Jeep Grand Cherokee Run without gas?

Without gas your Grand Cherokee will not run at all. With that in mind, most of the symptoms of a bad fuel pump revolve around the vehicle stalling out or not running at all. In modern fuel injected vehicles, the fuel pump sits right in the fuel tank and “pushes” the gasoline to the fuel rail (s).

What are the symptoms of a bad fuel pump in a Jeep Grand Cherokee?

Here are the most common symptoms of a bad fuel pump in your Jeep Grand Cherokee: One of the most common signs that a fuel pump is going bad is a whining sound. The whining sound can indicate that the fuel pump is going out before there are any performance based issues.

Where is the fuel gauge on a 4.7L Jeep?

The engine, in your 4.7L Jeep, comes equipped with a fuel pressure test gauge test port called a Schrader valve. It’s to this Schrader valve, located on the fuel injector rail, that we can connect the fuel pressure test gauge to. NOTE: If you don’t have a fuel pressure gauge, take a look at the section: Where To Buy A Fuel Pressure Test Gauge.

FOUND PROBLEM! | Jeep Garage – Jeep Forum 5 lb oil pressure at idle… FOUND PROBLEM! I know, everyone is probably saying “Oh man, not another low oil pressure thread” but this has a solution.

What happens to the oil pressure at idle?

But over this past winter, I noticed a significant drop in oil pressure at idle when the engine/oil is hot. Not too bad, but noticeably lower than the normal mid-point on the gauge. This only happened when hot. Idle at starting or just a few miles showed no change in pressure.

Is there a solution for low oil pressure?

I know, everyone is probably saying “Oh man, not another low oil pressure thread” but this has a solution. I recently rebuilt my engine and have yet to put many miles on it. (working on it little by little to get it how i like) I bought a full rebuilt kit for it. including new oil pump.

What kind of engine oil for Jeep Cherokee XJ 1988?

The table shows all suitable motor oils for Cherokee Xj, made in 1988 — 2001. Print To buy the right oil you need to know SAE viscosity index and API quality oil for diesel or gasoline engine. You can select any Brand from the listed. Example: for gasoline engines Jeep Cherokee (Xj) 1988, suitable multigrade mineral oil 10W-30 quality SG.

Why does my oil gauge keep going bad?

If installing a thicker viscosity oil raises the oil pressure, then something major is wrong inside the engine. Besides, modern cars are designed to use very thin oil anyway. Gauge Problem vs Oil Pressure Problem Dashboard gauges do occasionally go bad, but it is very rare.

Where do I find the oil pressure gauge?

Locate the oil pressure sending unit on the engine (the parts store can sometimes tell you where it is), remove it and follow the instructions that come with your universal oil pressure gauge to hook it up. Then drive the car and see what the gauge does.

Why is oil pressure reading 0 on my Chreokee?

It’s probably just the sending unit going bad, if you don’t hear any tapping or other noises when the gauge is reading 0 your probably ok. You can always get a cheap mechanical gauge and hook it up temporarily to varify the pressure. I believe the sensor on the 4.0 is right by the oil filter.

How do you check your oil pressure while driving?

What should the oil pressure be at idle?

First thing I put my mechanical gauge on it to be sure it wasn’t a sending unit issue and it showed basically no oil pressure at idle when it is hot at 205 to 210 degrees.

Why is my oil pump not working at idle?

The oil flows through the spaces too easily and the pump can no longer maintain pressure at idle. The pump itself is simply a couple of impellers that look like two gears through which the oil passes as they’re turned by the engine.

Is the oil pump OK when the engine is not hot?

And again, perfect pressure on idle at starting or short drives. I gotta think the oil pump is ok, due to the fact that idle pressure is fine when the engine/oil isn’t hot. Furthermore, the pressure is ok while driving when engine/oil is hot.

What’s the oil pressure on a 1990 Jeep?

Jeep lovers I cant figure this one out.. its a 1990 4×4 4.0 L Cherokee, Even after an oil change the oil pressure gauge says 40+ psi when I first start the motor but after warming up to 185 degrees the oil presure drops to around 20 psi and alittle lower at idel speed. The engine dosnt use oil and there is no rod knocking sounds.

Why does my oil pressure drop after replacing the pump?

The only thing it could be after replacing the oil pressure sending unit are the main bearings, camshaft bearings and or the oil pump. The lifters would not affect oil pressure but will be affected by low oil pressure by making noise.

What’s the best oil pressure switch for a jeep?

Shop AutoZone for Jeep Cherokee Oil Pressure Switch. 10% OFF $75. Use Code: DIYSAVE10 Online Ship-to-Home Orders Only

Is the 99 WJ 4.0 camshaft the same?

Since i cannot find a cam for a 99 WJ 4.0, are ALL 4.0L Camshafts the same? some places say yes, some places say no. Im thoroughly lost. Advance Auto Parts lists the same part number for a 99 XJ and 99 WJ for camshafts, so i would believe so… try dealer or Craigslist for a wreck. try dealer or Craigslist for a wreck.

When does the oil pressure drop to 0?

My oil pressure is dropping to 0 when the engine is warm and at idle. When the revs are above idle; or the engine is still cold, the oil pressure is reasonable.

What to do if your oil pressure is low?

Easier to replace the pump than the engine. Definitely install mech. gage, just swapping sensor cost me an engine rebuild. Check the oil pan for sludge (stick a flat head screwdriver in the drain and try to scoop what’s on the bottom of the pan see what comes out)

How to check oil pressure in a jeep?

Click to expand… If i have a sticker on the inside of my hood or core support (dont remember which) with a number hand written on it, saying “This vehicle has had modifications done… blah blah blah” and its a Chrysler sticker, is there a way i can look up that number and find what was done to it?

My oil pressure is dropping to 0 when the engine is warm and at idle. When the revs are above idle; or the engine is still cold, the oil pressure is reasonable.

Is there a problem with low oil pressure?

FOUND PROBLEM! I know, everyone is probably saying “Oh man, not another low oil pressure thread” but this has a solution. I recently rebuilt my engine and have yet to put many miles on it. (working on it little by little to get it how i like) I bought a full rebuilt kit for it. including new oil pump.

Why is my oil pressure reading so erratic?

Contrary to popular thinking, using an engine oil that is too thin will not make the gauge reading erratic on an engine that is in good mechanical condition. If installing a thicker viscosity oil raises the oil pressure, then something major is wrong inside the engine.

Why is my oil pressure sensor at zero?

Oil pressure gauge is at zero Most older cars have an actual mechanical gauge that gives the driver a readout on the oil pressure. If this gauge is reading zero even when oil levels are where they need to be, then the oil pressure sensor is probably to blame. Modern cars that have a oil pressure gauge use an electronic signal.

What happens if your Jeep Wrangler has low oil pressure?

One of the most serious issues that can happen to your Jeep Wrangler‘s engine is if ends up with low oil pressure. Low oil pressure will cause the engine to seize up. When the oil pressure light on, it should be assumed that the engine locking up is imminent.

Can a low oil pressure cause engine to seize up?

Low oil pressure will cause the engine to seize up. When the oil pressure light on, it should be assumed that the engine locking up is imminent. We advise not running the engine until the issue can be properly diagnosed. There are many things that can cause low oil pressure. Below, we’ll review the most common causes:

Where does the oil gauge needle go when oil pressure is low?

The gauge needle will continue to be positioned at the middle of normal range on the gauge scale until the cluster receives a message from the PCM that indicates the engine oil pressure is low, or until the ignition switch is turned to the Off position, whichever occurs first.

What causes a Dodge Ram 1500 to lose oil?

General causes of OP loss would be: Low oil level bad Sender, defective gauge, clogged pump inlet screen, worn bearings, stuck regulator valve in the oil pump, worn out pump, sheared oil pump driveshaft, bad oil filter.

When does the oil pressure go up or down?

When your engine is idle or when you’ve just started your car, the oil pressure gauge will have a low reading. When the engine starts running and heating up or when you’re already cruising on the freeway, your gauge’s reading should increase.

Why does my oil pressure gauge go high when I am not driving?

The gauge should never read very high when you’re not driving because the engine should be fairly cool due to inactivity. If you park or idle your car after driving and your pressure gauge reading does not return to a lower number, the gauge is defective.

Why does the oil pressure drop on my Jeep Grand Cherokee?

When pressure is low, especially in cold weather, getting some engines to turn over and start can be difficult. Others will will start immediately, only to have oil pressure drop suddenly, causing the motor to sputter and engine and oil gauges to light up. Oil pressure will likely drop when an engine starts to leak or burn oil.

Why is my Jeep Grand Cherokee not turning over?

Jeep Grand Cherokee oil pressures problems are responsible for a significant string of symptoms. When pressure is low, especially in cold weather, getting some engines to turn over and start can be difficult.

Is there oil leak in my Jeep 4.7?

I had quite some oil consumption on my 4.7 and also didn’t see any smoke from the exhaust when accelerating, but finally saw it when decellerating and especially at night with an other car behind. Also when idling for prolonged time and then driving away, was showing a short but obvious puff of smoke.

Why does my oil pan keep losing oil?

A rusted out oil pan so rusted thru that it was weeping oil but not when sitting in my parking spot. careful cleaning and observation of the area of the rusty old oil pan showed it was weeping and saturating the rust in the surrounding area and I asume that airflow when driving was wisping it away like an expensive air oiler lol.

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