Question about 1990 Jeep Cherokee Limited

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How can I recover the power (performance/horse power) of 1990 JEEP CHEROKEE LIMITED? this jeep has been stopped for long time and i want to make back powerful as as close to manufacturer state as possible. What things should i change?

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  • Jeep Master
  • 5,317 Answers

First thing to do is have a compression test of the engine, to determine its internal condition and worthiness. Go from there. Low compression in any cylinders from worn rings or poorly sealing valves translates into poor performance and horsepower. What you want is good compression (about 140 psi minimum) across all cylinders, and near evenly balanced-all with nearly even figures. As a rule of thumb, all cylinders should be within 75% of the highest reading cylinder

Posted on Oct 25, 2012

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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Mikey108
  • 475 Answers

SOURCE: 2005 Jeep Grand Cherokee Problem

I would start by checking all the fuses under the hood.
There is a fuse called IOD which the factory leaves out and gets put in at the dealer.
That fuse could be bad.

Posted on Oct 31, 2008

SOURCE: 1995 Jeep Grand Cherokee squeaking and power steering

The squeaking is definately from the belts.
Have you tried adjusting them ?
Since now the power steering has failed it could be due to the power steering pump bearings,may be tight to rotate and thus the squeaking noise, or you may just need to replace the belts.
WD-40 wouldnt work permanently..try using STP belt dresser.
Hope this helps!

Posted on Aug 07, 2009

  • 52 Answers

SOURCE: 1996 jeep grand cherokee limited v8 5.2, A/C instructions?

  1. Disconnect battery. This must be done to prevent accidental airbag deployment.
  2. Using on A/C recovery unit, remove all R-134a refrigerant from the A/C system. See: Service and Repair
  3. Remove the shift knob by pulling sharply upward.
  4. Place the transfer case in low range. Pry the shift indicator bezel out of the console using a trim stick.
  5. Apply the parking brake and place the transfer case in neutral. Remove the parking brake trim insert. Remove the console attaching screws. Lift the console up and disconnect the 4WD indicator lamp hamess. Remove the console.
  6. Remove the passenger side knee blocker. Remove the single end screw. Remove the screws below the glove box. Remove the screw at the courtesy lamp. Remove the ash receiver and the screws behind it. Remove the instrument panel armature screw behind the ash receiver. Open the glove box and remove the screws behind it. Lower the panel and disconnect the lamp harnesses. For additional instrument panel service procedures to complete steps 6 thru 25, refer to Instrument Panel, Gauges and Warning Indicators/ Instrument Cluster / Carrier/ Service and Repair/ Procedures. See: Instrument Panel, Gauges and Warning Indicators\Instrument Cluster / Carrier\Service and Repair
  7. Remove the pod switch bezels on both sides of the steering column with a trim stick.
  8. Remove the drive side knee blocker. Remove the end screw and screws located at the bottom of the knee blocker.
  9. Remove the cowl top trim panel by prying it up with a trim stick. Remove the solar sensor if equipped.
  10. Remove the "A" post trim panels.
  11. Remove the remove the bolts that attach the lower instrument panel reinforcement to the instrument panel armature and remove the reinforcement.
  12. Disconnect the park lamp switch.
  13. Pull back the carpet at the transmission tunnel from the base of the instrument panel center bezel. Remove the nuts from the upper studs and bolts through the floor that secure the instrument panel center bracket.
  14. Remove the bolts that secure the instrument panel center bracket to the drivers side of the transmission tunnel.
  15. Remove the screws securing the Vehicle Information Center and remove it. Remove the screw fastening the mounting bracket.
  16. Unplug the vacuum harness connector or vent tube on ATC equipped vehicles and the wire harness located under the passenger side of the instrument panel.
  17. Remove the screws holding the passenger side kick panel, along with the screw from the kick panel shroud.
  18. Unplug the antenna cable near the right cowl side panel.
  19. Unplug the instrument panel wire harness connectors from the junction block at the right cowl side panel.
  20. Remove the bolts that secure the instrument panel armature to the windshield fence.
  21. Remove the nuts that secure the top if the instrument panel armature to the windshield fence.
  22. Remove the bolts that secure the ends of the instrument panel to the cowl side panel.
  23. Remove the nuts that secure the steering column to the brake pedal support and lower the steering column.
  24. Remove the bolts that secure the instrument panel armature to the brake pedal support.
  25. Place a protective cover on the seats. Lift the instrument panel off the windshield fence studs and maneuver the instrument panel out and lower it onto the seats.
  26. Disconnect the refrigerant lines from the evaporator tubes. Make sure to install plugs or tape the ends of the lines and fittings to ensure that excessive amounts of moisture do not contaminate the A/C system.
  27. Remove the vacuum line at the tee from the main vacuum supply harness. This line runs through the body with the upper refrigerant line.
  28. Disconnect the heater hoses from the heater core and clamp the ends closed to prevent coolant loss. See: Heater Core\Service and Repair
  29. Remove the coolant overflow bottle.
  30. Remove the Powertrain Control Module with connectors intact and set aside.
  31. Remove the heater A/C housing mounting nuts from the studs on the engine compartment side of the dash.
  32. Remove the heater A/C housing from the vehicle.
  33. To Install the components, reverse the procedure stated above. Torque Specifications: Instrument panel center bracket to floor transmission tunnel fastener: 28 Nm (250 in. lbs.) Instrument panel to windshield fence bolts and nuts: 12 Nm (105 in. lbs.) Instrument panel to cowl side inner panel bolts: 12 Nm (105 in. lbs.) Instrument panel to steering column support bolts: 12 Nm (105 in. lbs.)

Posted on Aug 11, 2009

ZJLimited
  • 17970 Answers

SOURCE: 1996 Jeep Grand Cherokee window relay

Check in the Fuse Block, the cavity 2, fuse 30 Amp c/Brkr (Section (8W Page 7)

More details about electrical system for ZJ Grand Cherokee, you can find here: ZJ-Secc-8W-Wiring-Diagrams

I hope help you with this (rated this help). Good luck.

Posted on Sep 24, 2009

  • 6982 Answers

SOURCE: PERFORMANCE CHIP FOR JEEP GRAND CHEROKEE

Have actually done some research on those and found that the horsepower increase advertised is in the higher RPM band (where in essence it is unusable). As far as fuel consumption goes, there is always a "trade-off" when it comes to that. On earlier carbureted engines it was fairly easy to squeeze more mpg from what you drive. Today's injection systems are very precise, and more difficult to get much more than factory standards from them. Three items you can do to get better mpg are: Keep the air filter clean (vacuum and shake out once a month), Use a good quality synthetic oil in the engine. Make sure your ignition system is in good condition and not arcing anywhere. Keep wires clean and plugs properly gaped (if you can't light the fire, you waste the fuel in that cylinder).
A new problem we all face is the introduction of alcohol into our fuel...It does not produce the same btu's of heat when it burns...heat is power.
the more alcohol in a system the lower the mpg is because it takes two times the quantity of alcohol to make the same amount of power.
One other forgotten item is the fuel injectors. Even the most well filtered fuel carries a certain amount of abrasive grit with it. As it passes through the nozzles it enlarges them. This alters the amount of fuel going into the engine. That, coupled with even a small amount of gunk (they all get that to some degree) alters the spray pattern and decreases efficiency.
Back to the "chip" ...I haven't seen anything there that would in any way justify the cost there. If $ were no object, I'd be more likely to put a turbo-charger on the engine and start looking at add-on overdrive units.
That's where you can get good solid results! (but expensive)

Posted on Feb 15, 2010

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