Oil Pressure 1995 Jeep Grand Cherokee

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Jan 092017

1995 Jeep Grand Cherokee LaredoI have a 1995 Jeep Grand Cherokee with a 5.2L v8. About 80,000 miles. I recently had an alignment done, and now I am having trouble with my oil pressure. (Probably not related.)
When the engine is idling, the oil pressure is about 2/3 of the way up, and as I speed up, the oil pressure gauge wiggles and twitches, and sometimes drops to about half way. When I drive fast, (60mph or faster), the gauge stays around the 2/3 mark.

What concerns me most is that there is sort of a clicking noise coming from the engine. It doesn’t sound quite like a “no oil” piston slap or whatever, but still it doesn’t sound good.

I had the oil changed after it started, and I’ve checked it several times, and the oil levels are good. Also, no check engine lights or anything, and the engine temp and voltage and idle and everything seem normal.


The most common reason for odd oil pressure readings would be a failing or faulty oil pressure sending unit.

Oil Pressure Test

Check for proper oil pressure at the sending unit passage with an externally mounted mechanical oil pressure gauge (as opposed to relying on a factory installed dash-mounted gauge). A tachometer may also be needed, as some specifications may require running the engine at a specific rpm.

  1. With the engine cold, locate and remove the oil pressure sending unit.
  2. Following the manufacturer’s instructions, connect a mechanical oil pressure gauge and, if necessary, a tachometer to the engine.
  3. Start the engine and allow it to idle.
  4. Check the oil pressure reading when cold and record the number. You may need to run the engine at a specified rpm, so check the specifications.
  5. Run the engine until normal operating temperature is reached (upper radiator hose will feel warm).
  6. Check the oil pressure reading again with the engine hot and record the number. Turn the engine OFF.
  7. Compare your hot oil pressure reading to that given in the chart. If the reading is low, check the cold pressure reading against the chart. If the cold pressure is well above the specification, and the hot reading was lower than the specification, you may have the wrong viscosity oil in the engine. Change the oil, making sure to use the proper grade and quantity, then repeat the test.

Low oil pressure readings could be attributed to internal component wear, pump related problems, a low oil level, or oil viscosity that is too low. High oil pressure readings could be caused by an overfilled

Oil Pressure Sending Unit Testing

  1. To test the normally closed oil lamp circuit, disengage the locking connector and measure the resistance between the switch terminal (terminal for the wire to the warning lamp) and the metal housing. The ohmmeter should read 0 ohms.
  2. To test the sending unit, measure the resistance between the sending unit terminal and the metal housing. The ohmmeter should read an open circuit (infinite resistance).
  3. Start the engine.
  4. Once again, test each terminal against the metal housing:
    • The oil switch terminal-to-housing circuit should read an open circuit if there is oil pressure present.
    • The sending unit-to-housing circuit should read between 15–80 ohms, depending on the engine speed, oil temperature and oil viscosity.
  5. To test the oil pressure sender only, rev the engine and watch the ohms reading, which should fluctuate slightly (within the range of 15–80 ohms) as rpm increases.
  6. If the above results were not obtained, replace the sending unit/switch with a new one.

Oil Pressure Sending Unit Replacement

oil pressure sending unit

  1. Disconnect the negative battery cable from the battery.
  2. Unplug the oil pressure sending unit wiring harness connector from the sending unit.
  3. Unscrew the sending unit from the engine block.
    To install:
  4. Install and tighten the new sending unit.
  5. Plug the electrical wiring harness into the sending unit.
  6. Attach the negative battery cable.

Air Bubbles 1995 Jeep Cherokee

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Dec 012016

1995 Jeep Grand Cherokee LaredoAir bubbles in the transmission fluid and slippy when its cold


Air Bubbles in the Transmission Fluid

This is an indication of the transmission fluid level being low. This may be from a leak in the system or under filled at the last transmission service. The transmission fluid level needs to be checked when the engine is hot and running, the transmission is in park and the vehicle is parked on a level surface.

When the fluid level is low the transmission will indeed slip. Continued driving like this will damage the internal clutches. Repair as soon as possible to prevent any damage. If the fluid looks burnt it may already be too late and may require a rebuild. Top off the fluid level and test the operation.

Belt Diagram 2007 Jeep Compass

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Oct 312016

2007 Jeep CompassI need a diagram for serpentine belt.


Serpentine Belt Diagram – Gasoline Engine

Serpentine belt diagram 2007 Jeep Compass

The accessory drive belt (2) is a serpentine type belt that is driven by the crankshaft pulley (6).

The belt drives the A/C compressor, generator (3), power steering pump (1) and water pump (7). Belt tension is maintained by an automatic belt tensioner (8 ).

Serpentine Belt Cleaning

Clean all foreign debris from belt pulley grooves. The belt pulleys must be free of oil, grease, and coolants before installing the drive belt.

2005 Jeep Liberty CRD 2.8 turbo charged engine

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Oct 152016

2005 Jeep LibertyMy Code reader indicates the following:
P1267 Cylinder #7 high to low short side
P1265 Cylinder #5 high to low short side
P1261 Cylinder #1 high to low short side

This is on my 2005 Jeep Liberty CRD turbo diesel with only 4 cylinders. Could this be a fuel injector issue? or maybe glow plug issue? Thanks!


Cylinder High to Low Short Side

Check valve cover wire harness connections first, including under the valve cover.

Possible causes
– Faulty Fuel Injector
– Faulty Fuel Injector Interface Module
– Fuel Injector harness is open or shorted
– Fuel Injector circuit poor electrical connection

P1261 Description

A fault is detected by the fuel injector interface module in the secondary (rearward) fuel injector circuit.

Panic Alarm Goes Off 2008 Jeep Patriot

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Oct 012016

2008 Jeep PatriotMy remote to open my doors would not work so I used the key. The panic alarm goes off and it would not shut off I disconnected the battery for 5 mins and when reconnecting it still the panic alarm goes off. How do I turn this off.


Try This:

  1. Disconnect battery
  2. Insert ignition key and turn it to the “ON” position(not “START”)
  3. Connect battery
  4. Move ignition key from “ON to “START”


Limp Mode 2013 Jeep Patriot 2.0

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Sep 082016

2013 Jeep PatriotWill only run 40mph


Your transmission could be stuck in limp mode. This is very common. Anything from a transmission internal malfunction to a bad speed sensor can cause the computer to put the transmission in limp mode. Chances are there are trouble codes in the computer that will point you in the right direction. Your local auto parts store will do this for free for you.

Limp Mode

If there is a fault detected with the accelerator pedal position sensor, the PCM will set the engine speed at 1100 RPM.

There are four preprogrammed modes from which the GPEC1 bases initial valve timing.

  • Starting
  • Idle or Part throttle
  • Wide open throttle
  • Limp-in or Default

From each preprogrammed mode, the GPEC1 adjusts valve timing based on operating conditions.

GPEC1 has calculated optimum intake valve timing of 112 degrees after Top Dead Center and optimum exhaust valve timing of 97 degrees before Top Dead Center. The GPEC1 pulse width modulates the oil control valves to advance or retard the camshaft to their desired location. The spool valve inside the intake oil control valve is energized and moves to allow pressurized oil into the advance chambers of the intake cam phaser. At the same time, the spool valve inside the exhaust oil control valve is energized and moves to allow pressurized oil into the retard chambers of the exhaust cam phaser. Oil enters the advance chambers of the intake phaser and the retard chambers of the exhaust phaser. Oil pressure releases the lock pin from its locked position and pushes against the rotor vane. Both the rotor vanes are moved, advancing the intake camshaft and retarding the exhaust camshaft.

Cooling Fan 2001 Jeep Cherokee

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Aug 192016

2001 Jeep Grand CherokeeWe changed our water pump and thermostat because my  2001 Jeep Grand Cherokee Limited 4.7l v8 would run hot while sitting. Well after we got everything done, we took it down the road. It started to run hot, check gauges light came on so I turned it off and then released pressure from radiator cap. And then tried to crank but it wouldn’t start with out foot on gas. It shuts off when you take your foot off the gas and is running like crap and is shaking. I’m stumped please help thanks


Sounds like you drove it a bit too long with the engine running hot before turning it off. If it ran just fine until the check gauges light came on, you probably blew a head gasket.

The cooling system needs to be bled and then topped off. If the top and bottom radiator hose are getting hot, then the thermostat is opening. Most common reason for overheating at idle only would be the fan is not coming on. This can be from the cooling fan relay, the fuse,  the cooling fan motor, PCM or the wiring harness.

2001 Jeep Grand Cherokee Cooling Fan Wiring Diagram


Electrical Issue 2000 Jeep Grand Cherokee

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Aug 132016

2000 Jeep Grand Cherokee LaredoMy 2000 Jeep Grand Cherokee Laredo has some electrical issue. First the windows are stuck in up position. The switches don’t work right. The left switches changed, center interior light stays on when vehicle in motion. And the information box overhead don’t work. All other gauges work fine.


Power windows use one fuse #12, 50Amp to power them. Check for power going tot he switch. If no power is going to switch check the fuse and power at the fuse. If the fuse is good and power is found, look at the wiring harness. Most common place for break in wiring harness is at the door jam where the door is opened and closed often.

The dome light is turned on with the multi-function switch. Make sure it isn’t turned on first. Then the light is turned on as a courtesy when the door is opened. If the BCM – Body Control Module thinks the door is open still the light will remain on. This can be from a failing door latch switch or the wiring harness as described above.

As for the overhead Vehicle Information Center, there are two fuses to check. Check #8, 15 amp and #22, 10 amp fuses.

Overhead Information Center Wiring Diagram 2000 Jeep Grand Cherokee

Aug 042016

2000 Jeep Grand Cherokee LaredoI was driving down the road in my 2000 Jeep Grand Cherokee Laredo 4.7 L V8 Power Tech. It lost power, backfired and stopped running. I thought the timing chain broke . I pulled it home and took it apart to see the timing chain. It has 3 chains, the left and front chains are tight and the right chain is a little loose. I can move the loose chain about a 1/2 inch . So can you help me please.



NOTE: This procedure must be performed with the timing chain cover removed.

measuring timing chain 4.7 engine Jeep Grand Cherokee

  1. Remove the timing chain cover.
  2. To determine if the secondary timing chains are worn, rotate the engine clockwise until maximum tensioner piston extension is obtained. Measure the distance between the secondary timing chain tensioner housing and the step ledge on the piston.
  3. The measurement at point (A) must be less than 15mm (.5906 inches)
  4. If the measurement exceeds the specification the secondary timing chains are worn and require replacement.


CAUTION: The 4.7L is a non free-wheeling design engine. It is an interference engine. Therefore, correct engine timing is critical.

NOTE: Components referred to as left hand or right hand are as viewed from the drivers position inside the vehicle.

NOTE: The blue link plates on the chains and the dots on the camshaft drive sprockets may not line up during the timing verification procedure. The blue link plates are lined up with the sprocket dots only when re-timing the complete timing drive. Once the timing drive is rotated blue link-to-dot alignment is no longer valid.

Engine base timing can be verified by the following procedure:

timing marks 4.7L engine Jeep Grand Cherokee

  1. Remove the cylinder head covers.
  2. Using a mirror, locate the TDC arrow on the front cover. Rotate the crankshaft until the mark on the crankshaft damper is aligned with the TDC arrow on the front cover. The engine is now at TDC
  3. Note the location of the V8 mark stamped into the camshaft drive gear. If the V8 mark on each camshaft drive gear is at the twelve o’clock position, the engine is at TDC on the exhaust stroke. If the V8 mark on each gear is at the six o’clock position, the engine is at TDC on the compression stroke
  4. If both of the camshaft drive gears are off in the same or opposite directions, the primary chain or both secondary chains are at fault.
  5. If only one of the camshaft drive gears is off and the other is correct, the problem is confined to one secondary chain.
  6. If both camshaft drive gear V8 marks are at the twelve o’clock or the six o’ clock position the engine base timing is correct. Reinstall the cylinder head covers.

timing chain marks 4.7 engine Jeep Grand Cherokee

Engine Warm-Up Mode This is an open loop mode. The PCM adjusts injector pulse width and controls injector synchronization by controlling the fuel injectors ground paths. The PCM adjusts ignition timing and engine idle speed. The PCM adjusts the idle speed by controlling the idle air control motor.

Engine Timing The PCM cannot detect an incorrectly indexed timing chain, camshaft sprocket, or crankshaft sprocket. The PCM also cannot detect an incorrectly indexed distributor.(*)

Aug 042016

1997 Jeep WranglerI have removed the skid plate on my 1997 Jeep Wrangler SE 2.5 l 4 cylinder 5 speed manual many times without issue. This time when I went to take it off the transmission wants to come down with it. As far as I know there is not a top transmission mount? what is letting it come down?


There is no top transmission mounts, you are correct about that. There are two engine mounts and one transmission mount. It is normal for the transmission to want to lower. You should place something under it to support it when removing the skid plate.

skid plate 1997 Jeep Wrangler


The transmission and transfer case crossmember is integrated with the transfer case skid plate.



  1. Raise and support the vehicle.
  2. Place a support under the transmission.
  3. Remove the nuts attaching the transmission mount to the skid plate
  4. Remove the bolts attaching the skid plate to the frame
  5. Separate the skid plate from the vehicle.


  1. Position the skid plate on the vehicle.
  2. Install the bolts attaching the skid plate to the frame. Tighten the bolts to 74 N·m ( 55 ft. lbs.) torque.
  3. Install the nuts attaching the transmission mount to the skid plate. Tighten the nuts to 28 N·m ( 21 ft. lbs.) torque.
  4. Remove the support under the transmission.
  5. Remove the support from under the vehicle and lower the vehicle.