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1991 Ford Ranger FUEL MILEAGE

Tiny
THEWAVE2064
  • MEMBER
  • 1991 FORD RANGER
  • 6 CYL
  • 4WD
  • MANUAL
  • 104,000 MILES
I am only getting 11 miles to the gallon! I have replaced O2 sensor, MAFTA air flow sensor, other sensors that I can't recall at this time. At sixty-five mph it will get a slight miss( flutter ). Diagnostic test shows all sensors working but that it is running very rich(930). If you pull the vacuum cap it drops to around(3-4). I have tried Fuel Injector cleaner but hasn't made a difference. I have to fill up every 3 to 5 days and mileage is consistently
11.45 to 11.75 ( Also replaced fuel filter and air filter )
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Sunday, August 16th, 2009 AT 7:01 PM

8 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
When was the last tune up? Also, has anyone checked to see if the catylatic converter is plugging?
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Sunday, August 16th, 2009 AT 8:37 PM
Tiny
THEWAVE2064
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  • 5 POSTS
I had the plugs and wires replaced about 3 months ago, and the catylatic convertor replaced about the same time. The truck had 2 convertors in line, they were replaced with one ( heavy duty I guess ). All the repairs that I have told you about, sensors etc, have been made in the last 3 months. Thank you so much for your quick reply.
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Monday, August 17th, 2009 AT 1:42 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Can you explain what you mean by Vacuum Cap (3 to 4)
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Monday, August 17th, 2009 AT 9:33 PM
Tiny
THEWAVE2064
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https://www.2carpros.com/forum/automotive_pictures/397234_DSC00010_1.jpg

It is the cap to the left of vac. hose to brake booster. When they pulled that cap the reading of running rich(930) dropped to ( 3 or 4 )
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Tuesday, August 18th, 2009 AT 4:15 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Sorry, I can't tell which is the booster vacuum hose. Are you refering to the rubber cap that is plugging a vacuum port? If so, that makes sense because you are allowing more fresh air to the engine. I reviewed our past posts. Has the EGR been checked to make sure it isn't plugged with carbon? I didn't see any mention of that.
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Tuesday, August 18th, 2009 AT 10:24 PM
Tiny
THEWAVE2064
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Honestly I do not know if it was checked.
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Wednesday, August 19th, 2009 AT 8:01 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
It is located on the intake. A vacuum line will be going to it. If you remove it, just check to make sure it isn't plugged with carbon as well as where it attaches to the intake.
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Wednesday, August 19th, 2009 AT 6:13 PM
Tiny
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EGR checks out fine.
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Monday, August 24th, 2009 AT 2:38 PM

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