New to the site...and a newbie to Fords in general.
83 Grand Marquis with 139k miles. 302 FI engine...all original. Will start fine but recently had a scary incident: travelling at about 60mph, the motor started losing power. Required more gas pedal...but was soon only doing about 20mph with gas floored. Did begin to smoke some out the exhaust.
Not sure if this is a 'full tuneup' kinda fix, or symptomatic of something far worse.
Also, on this model, is the FI a throttle-body design or are there injectors at each cylinder??
83 huh, not sure, but check under the hood. You should know what an injector looks like. I'd start with the simple and obvious (yes I'm an optimist). When was the fuel filter last changed? A quick disconnect tool, a new fuel filter and a trip under the car will let you find the filter (most are located on the driver's side frame ,inside frame, and are snap in and out cannister types) and change it for little money. Word of caution though, get out the air hose and blow the road debris out of the quick disconnect fittings BEFORE using the tool, or you will have a fitting which is neither quick, nor will it disconnect.
If this fixes the problem, great. Throw in a bottle or two of injector cleaner in the tank and be done with it. If it doesn't fix it, then I'd look at the CAT also.
I spent half an hour in the parts store parking lot searching for the filter on the driver's side, because that's where I was told it'd be.
Looked under the passenger side, found it, and had the thing swapped ten minutes later. Hehehe.
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