Awful gas mileage 2002 Ford Ranger

DAWGFAN21

MEMBER
2002 FORD RANGER
6 CYL
2WD
AUTOMATIC
134,000 MILES

My 2002 Ford Ranger went from getting about 20 mpg to about 12 mpg. After I had the mass air flow, and coil pack replaced. The plugs and plug wires are only a couple months old. The decrease in gas mileage only happened after I got it back from the shop that changed the MAF, and Coil Pack. They say they didn't do anything else that would have caused the drop in gas mileage. Any idea on what could have caused this?

Sunday, June 26th, 2011 AT 4:04 AM

3 Replies

DANLESABRE

MEMBER
230 POSTS

Why did you replace the mass air flow sensor and coil pack? Was/Is there a check engine light?

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Sunday, June 26th, 2011 AT 6:13 AM

CJ MEDEVAC

MECHANIC
11,005 POSTS

Heavy Foot?

Does your Check engine light verify it works, upon start up?

Is it on?

Most popular parts stores will scan your codes for FREE!

Been performing scheduled maintenance?

Any Wild--non-stock modifications. Wheels/ tires?

Midnight Siphoning Neighbor?

Sneaky Teenagers?

Odometer Accurate?

Emergency Brake On?

Your Rebuttle Time!

The Medic

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Sunday, June 26th, 2011 AT 6:19 AM

RASMATAZ

MECHANIC
75,992 POSTS

Could be running too rich due to the following

Tires and wheel alignment problems could reduce it to include a slipping transmission. Have the shop to read the fuel trimmings live data

1. Excessive fuel pressure can be cause by restricted fuel return line
2. Defective Oxygen Sensors.
3. Leaking injectors and fuel pressure regulator.
4. Coolant temperature sensor out of calibration.
5. Restricted air intake system.

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Sunday, June 26th, 2011 AT 7:51 AM