The radiator cooling fan may fail to turn on resulting in an engine overheating condition, or The fan may not turn off once it is on. Chrysler has released a service bulletin to address this issue. The repair involves install a jumper wire harness and new cooling fan relay.
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Repairpal verified 1998 Plymouth Neon problems
There have been reports of premature head gasket failure; an updated gasket design is available to correct this problem.
When a no start condition is caused by a faulty camshaft or crankshaft sensor, related fault codes stored in the powertrain control module (PCM) should not be trusted. Our technicians tell us that under certain conditions a fault code can be stored for the "good" sensor. Care should be taken to properly diagnose this condition.
Spark plug tube seals fail, causing the tubes to fill with engine oil and the engine to misfire. As a result, the engine may run poorly and fuel economy can suffer.
If a Check Engine Light illuminates indicating leak detection pump (LDP) failure, the cause is often pinched or disconnected vacuum lines to the pump. Vacuum lines should be inspected before replacing the leak detection pump. Contamination (carbon or debris) in the pump can cause failure and any hoses should be cleared before a new pump is installed.
If the screws holding the case of the powertrain control module (PCM) are not tight, the tachometer may fluctuate or bounce from 300 to 1000 RPM while driving at a steady speed.