Mercury Repair Questions? Ask a Mechanic for Answers ASAP
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Is the check engine light on?
Does the O/D light blink on start up or when this is happening?
Many times this condition can be the result of a faulty throttle position sensor. If the computer doesn't know how much throttle you are giving it, it won't know what gear it should be in. This can happen without setting the check engine light because it's all based on voltage. If the voltage is wrong, the computer isn't smart enough to know that, so it will just try to put it in the right gear based off the throttle position. If the speedometer is working fine, then that is the other major input as well as the output shaft speed sensor (OSS) if you don't have a flashing OD light, that usually means there isn't a code stored in the transmission module. It sounds like it's a problem with the TPS
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