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On the 3.9L V6 and 5.2L V8, rerouting the ignition coil wire and spark plug wires can help solve a misfire and/or surge problem that occurs at approximately 45 mph. A service bulletin was published that outlines the specifics of the repair. It states the rerouting procedure should be performed before other repairs are done for misfires, surging or spark knock.

On 3.7L V6 and 4.7L V8 engines the camshaft position sensor may fail causing the engine to crank but not start or it can cause intermittent stalling. A failed camshaft position sensor will require replacement.

The distributor pickup plate commonly fails causing intermittent stalling, or the engine may not start (usually when the engine is hot).

A surging or bucking during acceleration can be caused if the distributor is moved or mis-indexed. This is a result of the cam and crank position sensors being out of synchronization. Wear of the oil pump drive gear can cause similar symptoms because it allows excessive free play in the distributor drive. The distributor drive gear and bushing should be replaced if the rotor tip moves back-and-forth more than 3/16th of an inch when checking drive gear free play.

If the transmission delays initial gear engagement after being parked overnight or longer, it may be due to a suspect transmission cooler return filter. If the transmission was recently serviced and the part number for the cooler return filter contains an "AB" suffix at the end, a new filter should be installed.

Various drivability problems can be caused by vacuum leaks. This engine has plastic tubes that become brittle and crack over time. These tubes can be replaced by normal vacuum hose but be careful when changing the Tee fittings or hose connectors because some have built in restrictor orifices (usually color coded). If the restrictions are missing, drivability problems will most likely result.

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.

If the HVAC (heater) housing is not properly sealed at the bulkhead (firewall), water can leak into the passenger compartment. Foam sealant should be used to seal any gaps and the evaporator drain tube can be modified to prevent further water entry.

Coolant can leak from the area where the water pump mates to the water pump housing because the sealant degrades over time. Coolant can also leak where the water pump housing mates to the engine block, which is sealed with an O-ring.

 

Coolant can leak from the area where the water pump mates to the water pump housing because the sealant degrades over time. Coolant can also leak where the water pump housing mates to the engine block, which is sealed with an O-ring.

 

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.

Exhaust manifold bolts commonly break, exhaust manifold gaskets should be replaced and replace bolts as needed.

3.7L V6 and 4.7L V8
Exhaust manifold bolts commonly break, exhaust manifold gaskets should be replaced and replace bolts as needed.

Black smoke from the tail pipe, hard starting, and a rough idle can be caused by a leaking fuel injector. With the air cleaner removed and the engine idling, fuel can be seen leaking from around the injector (O-ring leak), or from the nozzle (fuel injector leak).