Scratchin my bald-ass head here.

[cbxer55]

So, I read anarticle on my phone on MAF testing. Stated if you pull the plug while warm and idling, the engine should die. DIdthat today, pulled plug on warm idling engine. NO CHANGE. Nothing. Sat there purring like a kitten. Hmmmm.....

Read another saying if you remove the oil filler cap while idling and placeanapkin over the opening, it should try andsuck the napkin in. Or puff it out if the PCV system is plugged. Once again, BIG NOTHING. Didn't suck it in, didn't puff it out. NOTHING. So, I had a threaded crankcase breather on my grudge shelf. Put it on, revved the engine, VROOM, just like always.

Drove it to work after doing both of the above. Perfectly fine, Filled the tank at the half mark yesterday, checked mileage. 20.55 mpg. On a 3.0 Ranger with 4.10 gears.

What gives here? How is my truck even running. The o2 sensors are 28 years old and have 209,000 miles on them. I'm certain they are bad, but it still runs just perfectly fine. 20.55 mpg on a 3.0 Ranger is actually outstanding.

Is my truick haunted?

 

[Li'l Work Truck]

 

[SenorNoob]

Sounds like you just got the one that was built for the quality department to inspect. LOL

I'd bet that's actually more common than the group here would lead you to believe. Lots of people get here because they had a problem.

 

[pentode]

I was just typing "sounds like you have a healthy truck" when the above came in.

I don't actually know the fueling strategy on the 3.0 computer but I would guess it knows it's running from either the cam and or crank sensor and just defaults to a safe value if the maf signal is lost. I would think it would throw a code pretty soon though.

I also wouldn't expect much pressure or vacuum under the valve cover if the valve guides and valves are healthy (and rings too I suppose)

My 3.0 has 240k on it and AFAIK has the original O2 sensors and they work just fine. And I would guess yours are too if you're getting 20 mpg.

The 3.0 gets no love but it's a great little gutless motor.

 

[alwaysFlOoReD]

I've been thoroughly impressed with my 3.0 in my 2011 Escape. About 200,000 miles on it. There is a check engine light to do with an emissions component but that hasnt affected the drivability much.

 

[Curious Hound]

It's a 3.0l. They're great.