why am I getting bad gas mileage ?? - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 07-23-2014
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Icon4 why am I getting bad gas mileage ??

filled up my tank today and I have burned a quarter tank today only going 30k!!!!! my truck is all stock..

someone help
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Old 07-24-2014
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Reads like a fuel leak, could be filler hose, gas leaking out on each corner you go around.

I would start smelling around.

Pull a spark plug and have a look, if it is getting blackish residue you are burning the fuel.

What is idle like cold and warm, cold should be 1,000rpm, warm 750rpm

If idle is not dropping engine may be running to cool, that's bad for MPG
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Old 07-24-2014
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Quote:
Originally Posted by RonD View Post

Pull a spark plug and have a look, if it is getting blackish residue you are burning the fuel.
This advice is like telling someone in the year 2014 "start a fire by rubbing 2 sticks together"

Why not just use a match?

Your ECU monitors through closed loop the fuel mixture. It keeps track of how many times the mixture switches from lean to rich. This information is used to trim the fuel map. If the truck is running rich, the injector pulsewidth is reduced. You can see this with a scanner.

much easier than reading a sparkplug.
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Old 07-24-2014
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are you using motorcraft spark plugs or another brand

i was getting horrific mileage with my former fx4

turns out after i traded it in , the ECM is programmed to read emissions from iridium spark plugs

platinum spark plugs are crap in the 4.0 engines
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Last edited by RonD; 07-24-2014 at 11:33 AM.
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Old 07-24-2014
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Quote:
Originally Posted by Jp7 View Post
This advice is like telling someone in the year 2014 "start a fire by rubbing 2 sticks together"

Why not just use a match?

Your ECU monitors through closed loop the fuel mixture. It keeps track of how many times the mixture switches from lean to rich. This information is used to trim the fuel map. If the truck is running rich, the injector pulsewidth is reduced. You can see this with a scanner.

much easier than reading a sparkplug.
Ah, the young.

"start a fire by rubbing 2 sticks together", those that forget this will spend a cold night when their technology(or matches) fails them.
Computer controlled systems are way better than "the old systems" but they are not smart.

Spark plugs simply can not lie, and as easy as it is to do it is certainly worth a look.
The fact that the MPG has dropped and there is no CEL(check engine light) mentioned would indicate a leak OR the computer isn't seeing a problem with an over rich mixture, the fuel trims might look just fine on a scanner because computer, or one of it's sensors, is the problem.

Last edited by RonD; 07-24-2014 at 11:29 AM.
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