Mystery Ranger Death Syndrome...

[freedom5]

OK - I wont refer to you by your psuedo anymore. Me, I'm not ashamed of signing my real name or handle.

 

[gjm4l]

^ What? Either your nuttier than a squirrell turn or just messing with adsm08, I hope the latter. But regardless that post makes NO sense.....

 

[Bronclow2]

F***ed Again!

Ok, So when I disconnected the O2's it ran better overall, and WOT was perfect. Idle was not great though. So I assumed it was the O2's .

Today I replaced both with brand new and went for a test drive....back to the same as before so now $150 further in the hole and no progress.

I need Ideas other than sensors because they have all been replaced or tested good. places to look things to test .
HELP!

 

[Andy D]

This is all generic O2 factoids, not specific Ranger info. In open loop , the ECU is running .45-.55 v . If it is lean it is .1- .45 , rich is => toward .9 v . A good sensor should be dithering rapidly . I 'd be looking for a vacuum leak if the new sensors didnt take.

 

[MrRangerSir]

Ok, So when I disconnected the O2's it ran better overall, and WOT was perfect. Idle was not great though. So I assumed it was the O2's .

Today I replaced both with brand new and went for a test drive....back to the same as before so now $150 further in the hole and no progress.

I need Ideas other than sensors because they have all been replaced or tested good. places to look things to test .
HELP!

Unplugging the O2 sensor only forces open loop mode. It does not necessarily mean a bad O2 sensor. Since the engine ran better in open loop mode, you now have to diagnose what is causing it to run poorly in closed loop, (normal) mode.

Back to basics. CEL light? codes?

 

[Bronclow2]

Still Junk

CEL comes on for mabee a minute...sometimes, but it doesn't store any usefull codes. (I'll try to catch it while it is on)

After disconnecting the O2's " better overall" is misleading it still was not drivable. It convinced me I had got the problem ...onward...

I now know the O2s are good, and I know its lean... giving more fuel fixes it.

Vacuum leak? I kinda doubt, because it would have to be somewhere I couldn't hear, or so large that it wouldn't hiss. Ideas?

I revisited the MAF today, tried a junkyard sensor, same result and again tests good according to the haynes manual.

In the process of doing this I disconnected the MAF while the truck was idleing and it didn't stall... it runs better, like perfect. Iv'e done this before and it usually stalls the engine.

Should it run with that disconnected? what does yours do? (anyone)

I left it disconnected to make it drivable but I really want to fix this POS.

 

[Bronclow2]

Since TRS has been down for a while I spent some time hunting other forums to hopfully find somthing to steer me in the right direction.
I found the following link relating to ECM failures and got the answer I was looking for.
http://www.explorerforum.com/forums/showthread.php?p=2898548#post2898548
I Checked the capacitors in the ECM of my ranger and sure enough crap!

Top picture shows the puddle of goo and burnt stuff and the lower you can see has leaked and certainly on its way to failure

I don't know why the picture wont show but you can see it at: http://tinkerandfiddlewith.com/ranger.htm