On the V-6 engine, oil in the spark plug tubes can cause a misfire. Resealing the tubes as part of replacement of the valve cover gasket and replacing the spark plug wires will commonly repair this issue. On newer models the misfire can result in illumination of the Check Engine Light.
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Newest reported 1994 Honda Passport problems
A worn vehicle speed sensor driven gear can cause the speedometer not to work. Replacing the worn out speed sensor should correct this concern.
Fuel injector "leakdown" can cause a long crank time after the engine is warmed up. The fuel injectors need to be replaced to address this problem.
Varnish build up in the engine can cause one or more hydraulic lash adjusters to stick and cause a ticking noise in the engine. The noisy hydraulic lifter will need to be located and cleaned to stop the noise.
Dry suspension components can cause a spring-type pop when it moves. Lubricating the suspension will stop the noise.