Problem Reports
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1997 Jeep Grand Cherokee Problems
Brake Pulsations Due to Warped Front Brake Rotors
Due to warped front brake rotors or variations in the thickness of the rotors, brake pulsations may develop. The best method to reduce pulsations is to use an "On the Car" brake lathe (as long as the rotors are suitable for turning). "On the Car" equipment can correct variations (or "runout") in the rotor surfaces because it also corrects variations in other components (e.g. the hub).
Temperature Blend/Recirculation Doors May Fail and Cause AC Problems
Temperature blend and recirculation doors commonly fail, which can cause the AC modes not to change or the temperature to be different on the left and right sides. If replacing blend air doors, a recirculation door, a door link, or a sub-assembly housing, new heating, ventilation and AC (HVAC) sub-assemblies are available that improve reliability.
Front and Rear Differential Pinion Seal and Transfer Case Leaks
Leaks at the front and/or rear differential pinion seal and from the transfer case are common. Leakage from the transfer case normally occurs at the case-mating surfaces and require removal of the transfer case to reseal.
Loose/Worn Suspension/Steering Components May Cause Wobble in Steering Wheel
Loose or worn suspension and steering components can cause a wobble or shaking in the steering wheel. It may happen at a certain speed and subside as the vehicle accelerates through the range. Tire balance can contribute to this as well.
HVAC Air Flow Switching to Defrost When Accelerating
The AC/heater (HVAC) system may unexpectedly switch to the defrost mode when accelerating. This system is operated by engine vacuum and should be inspected for any vacuum leaks if this problem develops. There is also a revised vacuum check valve available to address this concern.
Ticking Type Noise Due to Cracked Exhaust Manifold
A ticking type noise may be noted from the engine area due to an exhaust manifold that has cracked where the pipes are welded; cracked manifolds should be replaced.
Offset Upper Ball Joints May Help Alignment Problems
When normal alignment practices do not bring components into the alignment specifications, offset upper ball joints are available.
Various Engine Oil Leaks
External oil leaks from the valve cover gaskets, intake manifold gaskets (front or rear), and the rear crankshaft seal area are common. The rear main seal is an unlikely source. Normally, leaks in this area are from the bearing cap mating surfaces as well as the sealing surface between the oil pan and bearing cap.
Increased Oil Consumption Due to Intake Manifold Gasket Leak
On 3.9L V6 and 5.9L V8 engines, the intake manifold gasket may leak and cause increased oil consumption and a spark knock during acceleration; the gasket should be replaced.
Carbon buildup at top of piston may cause noise
One the 3.9L V6 and 5.9L V8 the carbon buildup on the top of the piston is common. As the buildup increases with mileage and over time, symptoms may vary from light ticking, to ticking/hammering, to hammering/knocking noises. Fuel injector cleaner often solves the problem.
Seat Heater Inoperative Due to Damaged Element
A broken seat heater element located in the seat cover may make the seat heater inoperative. The condition usually occurs in the seat bottom; two repair kits are needed for each seat.
Noise When Driving Over Bumps From Transmission Area
If a thumping or creaking noise is heard from the transmission tunnel area while driving over bumpy roads, a transfer case shifter repair kit is available which should correct this concern.
The Fuel Tank is Hard to Fill and/or the Fuel Fill Nozzle Shuts Off Repeatedly While Fueling
The fuel tank may become hard to fill and/or the fuel fill nozzle may shut off repeatedly while fueling. Our technicians tell us that various items including the fuel tank, vapor recirculation tube, fuel fill tube, or EVAP system canister control valve may be at fault. Proper diagnoses will be required to determine the exact cause of this concern.
The Check Engine Light may Illuminate Erroneously
"False" trouble codes may cause erroneous illumination of the Check Engine Light. Updating the PCM software can often correct this concern.
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