Question about 2004 Mercury Sable

1 Answer

The car was hestitating so I changed the fuel filter and now the check engine light is on. Why is the check engine light on?

At first my wife put bad gas in the car. And it was running bad and the engine light came on. We put SeaFoam in with the next fill up and the light went off but the car still hesitates. Then I changed the fuel filter and the engine light came on because I ran the car out of fuel by taking the fuel pump fuse out. Why would the engine light still be on and the car still hestitates but not as bad?

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1 Answer

Bad gas isn't too likely

Sea Foam is a waste of your money

You don't diagnose & make repairs by adding
a Genie in a bottle

You have an OBD Check Light on,so why have you
not retrieved the codes & diagnosed from there?

If you run the fuel pump dry you can ruin that
It depends on fuel to cool & lube it

Fuel filters don't fix a thing either,they filter fuel & last 3 to
6 years with todays plastic fuel tanks that have little debris
vs the old steel tanks of 30 years ago

Once you get the codes you will find you have cylinder misfires,
bad ignition coils
The oxygen sensors get replaced at 100,000 miles,that is another
Have to clean the MAF Senser at least once a year

Need to do some studying

Posted on Jan 16, 2013


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SOURCE: I have a 2001 Mercury Sable 24 VOHC. Got P0303

It is likely one of you coils. You can buy one and keep moving across all the cylinders until you find the bad one or wait for it to set a code to tell you which one.

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SOURCE: 1998 Mercury Grand Marquis Fuel Pump Replacement

you can try just resetting the fuel pump switch located in the car

the switch is originally in the car for in case of an accident, however, if changed, chances are you also have to reset it

in my 98 grand marquis, the switch is on the left side of the trunk

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SOURCE: 2000 mercury cougar hesitating/jerking

I had the same kind of problem and I ended up solving it by actually checking for recalls for the 2000 Cougar and when you do, you'll see that there is a fuel pump recall. I dont' know if you've already done this but I figured i'd post this and try and help out!

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SOURCE: I have a 93 mercury topaz 4cyl 2.3L that stalls

It sounds to me like you replaced everything but the most likely cause of a stall while driving...The crank sensor.

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