2010 Ranger, 4 cylinder - No power.

[shumpertdavid]

You've pretty much summed it up.

It's hard to e-diagnose, but I am certain it's not trans related. If you'd hear it, you'd see that it's clearly running bad.

I guess in a round about way, the trans could be shitting out and binding up - but it would likely make noise etc?

I'd think you'd have enough experience to detect binding. I don't do much in the transmission department, but it's pretty well always acted like foot braking when I've had one bind. You try to rev the motor, it puts alot of load on it, and the rpm don't really go up a whole lot. I doubt it's binding the trans if you're getting good rpm climbs on the downshift. The lack of upper end acceleration and the lean bank codes lead me to believe you have a fuel\air issue. Be it a weak pump, restriction in the exhaust, air inlet \ sensor problem, etc. Some decent scan data while it's happening would be a help if you know someone with a scantool you could borrow.

[CJ]

Have you tried putting a fuel pressure gauge on the rail and tape it to the windshield and see what happens when you have the problem? Maybe it's a fuel filter or some kind of debris in there. And a lean code is symptomatic of that.

[franks]

Check the coil, my brother said they are bad about breaking down. Is it dohc or single? My 08 is dual but I think they changed it at some point

Also have you used a scanner he said sometimes they will have a pending code that hasn't been thrown the light off yet.

[goofygrin]

Rangers = coil pack issues. Hard to diagnose without spending $$ either unfortunately.

[KBScobravert]

buy a used coil from pick and pull. start at the front, replace and drive, repeat until you find the at fault cylinder then put a new coil in there.

[turbostang]

Have you tried putting a fuel pressure gauge on the rail and tape it to the windshield and see what happens when you have the problem? Maybe it's a fuel filter or some kind of debris in there. And a lean code is symptomatic of that.

I was actually going to do that yesterday, and flat forgot about it - too many things going on at one time.

I did put a filter on it already though.

One thing I noticed, this wasbn't too long after I had parked it - but the fuel was so hot that I couldn't get it on my hands, and it had a LOT of residual pressure on it when I broke the lines loose. It took several minutes of me cracking the line over and over to bleed enough off to keep it from getting sprayed everywhere.

[Rotortrash]

I had a 93 escort that had a problem very similiar to this, lack of power, and no CEL. After a LOT of hit and miss, turned out to be a dirty mass air sensor. Cleaning it helped, but I ended up replacing it, no more problem. It'd be a simple thing to take it apart, and clean it with some contact cleaner just to rule it out.