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2002 Runs rough and lacks power


bcstoy

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Phoenix AZ
Vehicle Year
2002
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Ford Ranger
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2WD / 4WD
2WD
Yep and they are costly, but I rather make them myself. This version is really difficult to do it, has a column shift.
 

bcstoy

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short update, damn truck nothing makes it run better. Still p1152, p0171, p0175. Lean on bank1 rich on bank 2. I am actually thinking about looking at the old motor to see if the rings were not installed correctly. It looks like it was recently rebuilt.

I did install a ford O2 and a Bosch O2, with the PCM re-flashed, I am really sick of it.
 

Brain75

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1990
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Ford Ranger
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2.9 V6
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Manual
2WD / 4WD
2WD
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215/70R14
where did you land on injectors? did you pull em and test, clean & test the OEM and reinstall?
 

bcstoy

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Yes B75 I had two sets, a cheap brand I got in offer up for $20 bucks and the factory ones. Tested both and measure resistance. Ended reinstalling the factory ones. For a truck that had three bad cylinders the truck ran well except for the rough idle. So I did not think the injectors were bad before. My scanner did not find any issue with the injectors either or any other sensors. The only thing I can think of is that the PCM is trying to compensate for a lean condition in bank 1 and in doing so it ends up opening all the injectors longer than it should resulting in a rich condition for bank2. I do not know how the PCM activates the injector drivers so I am merely speculating here.
I graphed the traces for SFT from both banks. The one on bank 2 was always above the one of bank1 suggesting something I already knew, rich condition.

At this point I doubt the lean condition is caused by something outside the engine. It could be something related to the valve train in bank1. I will pull the head to see if there is something going in there. There is a video where a guy found the seat receding too far into the head causing a lean condition, not quire remember now. Will search for it and watch it one more time.

I cannot give up on this. My friend wants his truck running. I should have sold him one of mine. I have 3 tacomas & 4x4 85 EFI long bed. There are more but will keep the list short since some of the are work in progress.
 

Brain75

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Location
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1990
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Ford Ranger
Engine Type
2.9 V6
Transmission
Manual
2WD / 4WD
2WD
Tire Size
215/70R14
RE:injectors - accepting that the resistance is good, how did they spray? fog of mist, jet streams or?

valves getting recessed is something known on 4.0L's if I remember right... I have no idea how common it is in 3.0L's. If you had valves that weren't closing due to recess you would be getting misfire codes too. The 4.0's/2.9' (cologne block) have nothing in common with the 3.0's (vulcan block) - so issues common to the 2.9 (head cracking) are almost non-existent on the 3.0's

A leakdown test will show you the valves. Unless you love tearing into the engine and replacing gaskets I would do a leakdown before opening it up.

A systematic look at what those 3 codes have in common:

P0171:
P0175:
  1. Faulty oxygen sensor
  2. Clogged fuel injectors
  3. Fuel pressure regulator issues
  4. Vacuum leaks in the intake system
  5. Malfunctioning mass airflow sensor
P1152: (I had to look this one up - not ran into it)
  • Faulty upstream heated oxygen sensor bank 2
  • Air leaks after the MAF or PCV or between them, which would cause a lean condition resulting in Rich Bank 2.
  • Bad MAF sensor
  • Faulty fuel pump
  • Lack of Upstream heated Oxygen Sensor Switch Sensor Indicates Rich Bank 2.
  • Bad PCM (less likely)
  • Vacuum leak on engine

Well as you can see all 3 have a bad O2 sensor on their list, that is the most likely in my books. Your aftermarket new O2 sensor could be like your 1 bad new injector - crappy aftermarket junk.

MAF shows up on all 3 lists... I've re-read 3 times now trying to get a good handle and I can't remember by the time I get to the post screen - where are we on MAF, cleaned the old, installed new?

There's something else that has to be on all 3 lists and you already said "the harness is lousy" - this all could be a wiring nightmare. I've never had to deal with any wiring problems other than breaks/cracks.... benefit of living in the desert (but at 30 years in the desert all plastic,rubber, wiring insulation is just about done - you only touch what you absolutely have to, and plan on replacing everything you touch...)
 

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