Hey guys i have a 99 ford ranger witha 2.5L and latley the gas milage ihas been getting worse. It idles rought and is weak going up some hills. i have replaced all the plugs and wires a couple months ago along with a new fuel filter. Any ideas as to whats wrong with it?
Thanks
David

 

The 2.5l's just a weak engine to start with. I average 20mpg with my 98 2.5l. Mine does alright going up hills though. Did you check the filter? Maybe a K and N filter will help.

 

You might wanna go to "muffler masters" or a place like that and get the catalytic converter checked. Usually they'll check it for free. I have an 88 ranger that was loosing power and gas mileage big time and it turned out to be the catalytic converter was in really bad shape.

 

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Or clogged injectors. I'd take a $10.00 roll of the dice on a bottle of techron.

 

How many miles are on the truck? Is the CEL on? Did the plugs and wires cure the rough idle? If not replace the coil pack(s)...

 

David: Does it "ping" going up hills?

As far as cleaning up your fuel and combustion systems - there is a thread in the Ranger forum which details how to "decarbonize" your engine. I personally have had excellent luck for years with a product called "Seafoam Deep Creep". It comes in both liquid and aerosol cans. I use the power brake line to introduce the product to the engine and intake. After the "soak" it will smoke like a chimney for a while and then stop. This tends to clear up a lot of ills. The aerosol is also excellent for cleaning up your throttle body - do not use carburetor cleaner as it has an adverse effect on the coating inside the body.

Give it a go and keep us informed. Were here to help.

Russ