We have a 1994 Grand Marquis. Sometimes when driving the check engine light comes on and suddenly she doesn’t want to accelerate very fast at all. If you do try to hit the gas, it sounds like the engine speeds up but there is no change in acceleration. It is also hard to get to/over 50mph. If you pull over and rev the engine a few times (slowly) there is an audible click from somewhere inside the engine. It will happen a few times and then the car seems fine. Inevitably the issue will come back a some miles down the road.
It doesn’t get driven every day and so far we have not had the light come on when we are near anyone that can read the error. Also, it resets and is not on if you turn the car on and off, even if the problem persists. It only comes on while driving (though it will stay on if put into park and left running).
Oh, and possibly related, it seems that the air that is put out form the defroster is very damp when this happens (sometimes).
We are perplexed…
The trouble code that makes the CEL come on is stored in the cars computer and can be retrieved by any auto-parts store…It will point you in the right direction…Post the code(S) back here…Oh-Oh…'94 models use a more primitive trouble code system. Few shops can read the codes…Sounds like dirty injectors, plugged fuel filter, bad spark plugs / wires…
Take your car to your mechanic and have him/her read the “trouble codes” stored in the car’s computer.
The codes will help your mechanic diagnose and repair the problem.
If you continue to ignore the problem it will get worse, until your Grand Marquis won’t run at all.
Follow <a href=“http://www.extreme-check-engine-light-codes.com/Ford%20OBD1%20Decoder.htm” target = _blank"> these instructions to pull your own trouble codes and then post them.