Mechanic has done a tune-up, has replaced coil, air intake gasket...says 02 sensor checks out fine, checked all hoses. Check engine light was coming on, picked up vehicle today, and light doesn't come on but it is starting to have this miss again. Now it doesn't matter if you accelerate or just coast the miss is still there. We replaced the harmonic balancer in the beginning of the year due to previous mechanics mishap with working on the truck, now mechanic is saying there is a possiblity that it still could be the harmonic balancer due to not have been put in correctly to begin with. HELP
MAF mass air flow sensor or any of the sensor that connected to air.
change your spark plug and clean the spark plug well.
SOURCE: 2003 Mountainer location of OBD2 connection
it is under the dash on the drivers side just to the right of the column.
SOURCE: Check charging system icon keeps coming on
I had the same problem with a 99 sable and it was the drive belt
SOURCE: I have a 2003 mercury mountaineer with 71,000
Have it rescanned and see if it is the same code. What engine do you have?
SOURCE: In 97 mercury mountaineer, how to turn off "check engine" light
Go to the local parts store, have them check the codes (they will do this for free usually). It will tell you what sensor needs to be checked/replaced. Once the part is replaced, it will clear on its own. They can also reset the code, but it will come back if the trouble persists.
SOURCE: 2004 Mercury Mountaineer fuel gauge not working
The most likely failure that will cause your problem is the fuel level sender in the gas tank. The sender will cause both the fuel gauge problem and the check engine light to be turned on. The sender will need to be replaced to repair the problem.
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