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Hey Everyone. Been a while but life got in the way of quite a bit. Going to simply copy and paste this, as it’s a bit of a long post- But every hint might bring us closer to getting this old gal back on the road.
Short story begins now:
Question for the group:
2005 Dakota 4.7 (not the H.O.)
Original symptom: Running rough at idle and off idle for a few minutes usually after a warm restart. (Does so mildly on a cold start) Runs fine once it figures itself out.
Codes set: Usual P0300 random misfire (no kidding?)
Work done: Plugs and coil boots. (OEM Champion plugs installed) Had to replace 3 O2 sensors before this truck went on the road. (2 broken off by last owner, 1 had dead heater) Issue still occurs. Noted we did have some weepy injectors (fuel pressure test showed system wasn’t able to maintain fuel pressure beyond 10 minutes.)
Most recently: Cleaned throttle body. (Did this on car using exact instructions on can) Found coating of black crud. Removed the IAC and gave it a light cleaning with some silicone lube. Also found negative battery terminal was loose. Removed, cleaned, and reattached. What I was able to reach with the intake and the butterfly air valve held open? Super clean now!
Gave it a test drive: Truck promptly fell on its face. Refused to accelerate with a lot of bogging down. Idle wasn’t the greatest. If you punch the gas-It downshifts as usual and takes off like a scalded dog until it upshifts. Computer set a few codes: (do not remember the IDs) One was System rich bank 2 sensor 1. The other was bank 2 sensor 1 circuit high. (This is the only O2 sensor we did not replace with the others)
Yesterday did more work on it: Replaced the weepy injectors. Factory injectors (obtained from the local P&P yard. I hooked them up to the fuel rail and gave it a test to ensure they all had a decent spray pattern and didn’t slowly weep out. All good) New O-Rings as well. No fuel leaks.
Yesterday’s test drive: Idle had mild improvement. Made sure to clear all PCM codes so we have fresh data. Truck did manage to accelerate much better. Idle still is crappy. Fair power but had a noticeable stumble at various sections of the power band. Not as bad as before, but noticeable.
Returned back to our work area and checked for codes. Had a couple of doozies in the pending area: P0175 System too rich bank 2. And one code I was hopeful NEVER to see… P0430 Catalyst system efficiency bank 2. (Hopeful that once we get the “Rich” code fixed, that efficiency code might become less problematic)
I’m off tomorrow (Friday) and will be doing the following: Replacement of the Bank 2 sensor 1 O2 sensor. Thought process is that the circuit ‘high’ code that it tripped, might point to a wonky sensor. Should be interesting, as that sensor is in an unholy place. I can’t see the fuel injectors causing the “Rich” condition, as they have been changed and verified to have a good pattern and not leaking. (Also did a resistance check. Each injector ran about 12.3. 2 were slightly less (11. 8 ), but within tolerance.
Also picked up another IAC motor and a TPS from the local P&P yard. Those will get swapped out as well to see if things get better or worse. Also, I have a borescope camera. So, I’ll be sticking that inspection camera into the O2 hole and seeing what the converter looks like.
Sorry for the short story. Any input or constructive advice is helpful. Really trying to get this Dakota back full force. But that one 02 sensor is going to be a treat…
There ends the copy and paste express! I posted this on a Dakota group page over at the “Book of Faces”. But so far no one’s really responded. I’ll be working with this tomorrow on my day off from work.
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