Problem Reports
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1995 Jeep Grand Cherokee
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).
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.
Water Leak and Sloshing Due to Clogged Evaporator Drain
The AC evaporator drain commonly clogs and causes water to leak onto the passenger side floor. A sloshing noise may also be heard from the water inside the heater housing. Decaying organic debris in the housing may cause an odor. A service bulletin (TSB 24-06-96) was released; it describes how to clean the drain tube without removing the heater AC housing.
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.
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.
Oil filter adapter may seep oil between adapter and engine block
On the 3.9L V6 and 5.2L V8 it is often misdiagnosed as a leaking oil filter gasket, the oil filter adapter can seep from between the adapter and engine block.
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.
Engine oil leaks at distributor may be misdiagnosed
On the 3.9L V6 and 5.9L V8 the engine oil leaks at the distributor can be misdiagnosed as leaks from the intake manifold seal, oil pan gasket, or rear crankshaft (rear main) seal. A revised distributor is available if oil is found inside the distributor.
Replace oil pump if oil filter casing shows signs of distortion
If the oil filter casing shows signs of distortion from excessive oil pressure, the oil pump should be replaced.
New sway bar bushings available to solve sueaking issue
Revised speed sensor will solve internal leaks in sensor/adapter
Damage to oxygen sensor and wiring harness
If the downstream (rear) oxygen sensor wiring harness contacts the propeller (drive) shaft, it can damage the oxygen sensor and the wiring harness for the sensor, and/or cause Check Engine Light illumination. The wiring harness should be repaired and secured away from propeller shaft.