Question about 1997 Mercury Grand Marquis

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Engine code p-406

Engine light came on when down shifted accerate up hill in gruise control

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The code is for the sensor for the EGR valve. The sensor is sending the computer a high voltage when it should be low.
The sensor and valve would need to be tested.

Posted on Jan 11, 2013

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Common problem is the passages to the egr under the upper intake get clogged up with junk and tend to set codes such as this one.

Posted on Apr 14, 2013

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1 Answer

When climbing hills and the transmission shifts down the service engine light flashes on and off. I also start to lose power as I'm climbing the hill. Whats causing this?


You did not post the year make and model BUT you should not drive the vehicle because when the check engine light flashes, you can cause damage to your engine. You need to get an OBD reader from a chain autoparts store and see what codes are present.

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Misses badly when accelerating or under a load. shift out of overdrive on incline due to power loss


Have you checked for codes?

Any dash lights lite?

Any testing done so far?

Have to do something then tell us,can't
guess and don't have the car to drive.

You most likely have ignition issues,if the
engine is hot & your going up hills

It down shifts based on shift strategy & vehicle
speed & many pcm inputs from sensors

Could be egr issues

Do you ever do any preventative maintenance?

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