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Hi,the inhibitor switch has dual purposes it signals the ecm that the transmission is in park or neutral to allow the vehicle to start it also will signal both the ecm and tcm on gear position so the proper shift controling is possible.The transmission is driven by fluid pressure, when you select the drive gear fluid pressure will push the forward clutch piston up so the clutches apply and vehicle will begin to move.This model year had many problems with the forward clutch piston seal leaking,it sounds like this is your problem,since you rev the engine your directing more pressure and in turn pushing the fluid so more pressure is applied making the transmission is engaged.the inhibitor switch needs to be adjusted properly , will the engine start while in park or neutral ?You may need to adjust the switch but this will not cure the problem your having,thanks.
Thanks for the information,it sounds like the inhibitor switch is adjusted properly.The leak I'm speaking of is internal,from my past experience I have not found any sticking of the valves if that is what you are referring to.After disassembling the transmission I 've found the piston seal ripped meaning nothing like a cfoam will correct the problem not sure if it would help.Does this problem all the time or is it intermittent?
Understood,the absolute best way to make sure this is it is to have the transmission diagnosed at the dealer or a specialty shop.Usually if the inhibitor switch is malfunctioning you would get a check engine light and a no start condition this problem your having because it is mechanical will not give you any warning lights.
It's the forward clutch ,so this is the piston that applies fluid pressure to get the car moving you feel the trans slipping when it is not yet fully applied.From my past experiences there are no warning signs,it is a rubber seal and due to age and mileage it wears.Again speaking from from what I've seen in the past that creates this type of concern ,without being at the car it's a little more difficult to diagnose but your description is very good and that's what my answer is based upon.Thanks