GRAND .

1993 Mercury Marquis

Tiny

dobybears

November, 4, 2011 AT 11:46 PM

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

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6 Answers

Tiny

fixitmr

November, 5, 2011 AT 3:10 AM

So the CEL does not come on? What motor is it?

Tiny

dobybears

November, 5, 2011 AT 4:21 PM

It's a v8

Tiny

cadieman

November, 5, 2011 AT 4:32 PM

You need to know the fuel pressure when this happens. Also remove the o2 sensor to check for a pluged exhaust.

Tiny

fixitmr

November, 5, 2011 AT 5:11 PM

So it only does this on long trips? Is it all highway (300)?

Tiny

dobybears

November, 6, 2011 AT 6:14 AM

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.

Tiny

fixitmr

November, 6, 2011 AT 4:46 PM

I'm thinking it could be an EGR valve issue? Or fuel pump issue?

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