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Several things need to be checked if a 1999 Mercury Grand Marquis is hesitating when accelerating. Does the hesitation only last a few seconds until the car is slightly warm? Do you hear a poping noice from the engine compartment? Is the check engine light on ? I have had similar problems and this type of problem is typically caused by air or fuel problems. 1999 Mercury Grand Marquis are fuel injected and any vaccume leaks can cause these type of problems. I would check all hoses to make sure they are secure. I would check the PVC valvs, I will check to make sure none of the hoses are blocked, I would check the idle air control valve and its passage, I would check the EGR valve and its passage, I would check the throttle body and bypass valve as all of these items can be gunked with carbon deposits. This should be a good beginning point but the answers to my questions will really help to narrow down the issue.
What else can I help you with?
What causes a car to hesitate and accelerate slowly?
Sounds like it could be a dirty fuel filter, try taking it off and cleaning it.
What causes cars to hesitate?
"What causes cars to hesitate?
What causes your windshield wipers on a 2001 Mercury Grand Marquis to shut off and remain in a vertical position?
system glitch or a short
In 97 Mercury Grand Marquis What causes cylinder 4 and 5 not to fire. I have new fuel injectors wires and plugs?
Have you checked the coil's ?
Are there unbalanced or balanced foces on Mercury?
There are unbalanced forces on Mercury due to its orbit around the Sun, leading to variations in its speed and direction. These forces cause Mercury to experience gravitational interactions that affect its trajectory.
A net force causes an object to?
Accelerate, motion is generated by applying force to mass.
What causes 01 Hyundai sante fe to hesitate when stepping on the gas?
Have you had your spark plugs or wires changed? The hesitiation when you step on the gas could be related to a firing issue. If you accelerate on the gas to go right away does it seem rough?
What causes the abs and traction control lights stay on all the time on your 1999 mercury grand marquis?
Probably a bad front wheel bearing/hub assembly with the abs sensor in it
What causes a low moaning sound coming from the air intake of your 1994 Mercury Marquis?
Isc motor is stuck or sticking causing a "blowing over bottle" effect in the intake tract.
What causes your 1999 Mercury Grand Marquis to start up and then die?
That's something you would have to look at yourself, we can't give you an answer unless you tell us in more... er.. detail.
What causes cigarette lighter to blow fuse after fuse in 1998 mercury grand marquis?
You got a short somewhere. Might be in the wiring, might be in the element itself. Either that, or you're overloading it.
What causes the headlights to come on when hitting unlock button on mercury grand marquis?
It's a safety feature that comes with the car. There's a way to turn it off, but you'd need the owners manual to do it.
