1993 Dodge Caravan gas mileage

2CHEROKEES

MEMBER
1993 DODGE CARAVAN
6 CYL
2WD
AUTOMATIC
160,000 MILES

Getting less gas mileage after new fuel pump installed replaved fuel pressure reg. There are new wires, pluga, air filter and throttle body has been cleaned. Timeing has not been changed car runs well has been well maintained since new. Getting 60 miles or more less per tank oxygen sensor has been changed one time compter showa no fault codes need some advice thanks for any advice

7 Replies

BUDDYCRAIGG

MECHANIC
2,262 POSTS

What is you MPG?

I suspect that it's been running lean all of this time either from a weak fuel pump or bad regulator. Just not lean enough to make the check engine light come on.

Now everything is working like it's supposed to.

Do a mileage test and compare the results with what it was advertised new.

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Tuesday, July 7th, 2009 AT 6:00 PM

2CHEROKEES

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New fuel pump was installed along with all the rest of the stuff I mentioned could it be o2 sensor but not registering as a fault code? Why lean versus rich computer shows no fault codes and viecle runs excellent. New pressure reg installed twice mileage used to be 18 city now around 12

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Tuesday, July 7th, 2009 AT 6:24 PM

BUDDYCRAIGG

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Have you done an actual mileage test? Or are those kinda "soft" numbers?

12 is really bad.
My 1967 Pontiac with a 455 gets 14 all day long.

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Tuesday, July 7th, 2009 AT 6:54 PM

2CHEROKEES

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Thans for reply 14 sounds great did actual test guess what 220 miles on 20 gal. Tank used to get 300 or more 3.0 eng. Got any sugestions i've tried to resolve this need to keep car awhile longer car has 90% highway miles and gets almost normal gas mileage on highway again thanks

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Tuesday, July 7th, 2009 AT 7:20 PM

BUDDYCRAIGG

MECHANIC
2,262 POSTS

You say you are getting normal MPG on the highway?
Check the brakes.

I worked on a Grand Am once that got horrible city mileage, but normal on the highway.

It ended up being a caliper was locking up every time you stepped on the brakes.
But after a few minutes, it would release.
So driving on the highway, it was normal.
But driving in town, where you have to use the brakes all the time, the caliper was constantly causing a dragging on the wheels.