1993 Mercury Marquis Repair Question
Asked on November 4, 2011
1993 mercury grand marquis.
Have taken 2 recent trips of 500 miles. When I get to around 300 miles, the car starts bogging down and will not go over 45 mph. It will snap out of it for awhile, then bog down again. While it is doing this, it uses twice as much gas as usual. When I get diagnostic reading at the parts store, all they can tell me is it's a fuel problem but cannot find specifics. Any ideas
Asked by dobybearsAnswer
Replied on November 5, 2011
so the CEL does not come on? what motor is it?
Replied on November 5, 2011
you need to know the fuel pressure when this happens.also remove the o2 sensor to check for a pluged exhaust.
Replied on November 5, 2011
so it only does this on long trips? is it all highway (300)?
Replied on November 6, 2011
Yes, it is only on long trips on the interstate. It seems to run fine in town. But after driving 300 miles non-stop when it's getting down to about 1/4 tank of gas, that's when it starts bogging down.
Replied on November 6, 2011
i'm thinking it could be an EGR valve issue? or fuel pump issue?