My mountaineer's check engine light just recently came on (133,000 miles) and it has almost no power. It starts right up but when you take it down the road it hesitates,spits & sputters, and seems to have a miss especially going uphill. You can smash it to the floor and it barely moves and this thing used to fly! Motor is the 5.0 w/ auto tranny. It had been sitting for about 4 months and I just started to run it full time recently. All gauges are giving normal readings! I know you have to check the codes but does anyone else know from experience?
Indicates a failing cat converter blocking the exhaust pipe ' have a muffler shop check the condition of the cat converter
SOURCE: Car is hesitating at time as if timing was out of whack
try cleaning out the idle control Valve. also called an IAC. Using brake cleaner remove the duct from the air cleaner and spray directly at the valve. It sits near the opening . It is a small component with 2 small hoses. If you can, remove it and spray right into the 2 holes on the underside.If that is not the problem it could be the EGR valve.Sludge bulidup in the IAC is a common problem.
SOURCE: engine first runs good, but progressive chug/misfire.
Check for vaccum leak, if not check or replace mass air flow sencor.
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.
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