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ryan
Dodge Dakota
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9/08/2005
17:35:08
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 Subject: P0171 will not leave
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I need some help. I have a 00 dakota with 4.7L and it's ran bad for a long time. Had it to 2 mechanics they cleaned throtle body and tps and said to run fuel injector cleaner. Also have replaced all 4 O2 sensors. began to see codes again : injector codes and fuel bank lean. dealer diagnosed fuel rail and 4 injectors bad so I replaced and next day have p0171 and it misses and jumps at highway speed and MPG sucks . After spending over 1,000 dollars and it still runs bad. Where should I go next : a new TPS??
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Rob C
Dodge Dakota
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9/08/2005
23:40:28
|  RE: P0171 will not leave
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Besides replacing parts, what have you inspected? Did you check your fuel pressure? Have you pulled the sparkplugs and looked at their color? When you say it runs bad, how does it run bad? Under what conditions does it run best/worst. Give us some details. Why did the dealer do what they did and send you on your way without fixing it? How many miles are on your truck?
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davec
Dodge Dakota
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9/09/2005
08:42:14
| RE: P0171 will not leave
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We need more information as RobC said. It could be anything from a clogged injector to a missing injector driver from the PCM. First thing I would do is return to the dealer and demand that the car be fixed like they said it was.
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ryan
Dodge Dakota
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9/09/2005
12:34:19
| RE: P0171 will not leave
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my mechanic has inspected and cleaned tps, iac , plugs, o2 sensors, fuel injectors. but never fuel pressure test. The problem with the dealer is they don't care if you have a way to get to work or not. My problem was diagnosed in a day but my fuel rail didn't show up for 2 weeks and then someone forgot to order the injectors. I am tired of dealing with dodge so I took it to another mechanic to get parts put on. The problem seemed like it was fixed when I drove it but the check engine light came back on and it started to act funny.. The truck runs ok now at first but after it warms up the idle begins to pulsate and you can't go down the road at 50mph smoothly. Also, the truck hesitates a couple of secs. when I accelerate from a stop. Then it finally starts to smooth out and after a cloud of thick black smoke will accelerate good. My main problem the whole time is the problem with the idle pulsating when trying to drive a steady speed and the amount of gas I dump in this POS daily. The truck has about 70000 miles on it and runs the worst after the motor is warmed up. I have read some fixed their idle proble with the TPS and some had success with a dealer reflashing the PCM. Isn't there a recall for reprogramming the PCM due to poor peformance and bad emissions.
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daddio
Dodge Dakota
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9/09/2005
12:41:39
| RE: P0171 will not leave
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i'd have that mechanic check the fuel pressure and the MAP sensor to make sure they are within spec. and i'd also go back to that first place and either demand some money back or get them to fix it right this time.
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JerryM
Dodge Dakota
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9/09/2005
16:15:49
| RE: P0171 will not leave
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Ryan,
What does the exhaust look like? Do you get black soot coming out of the tail pipe.
Also did the truck run better when the o2 sensors were changed.
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ryan
Dodge Dakota
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9/09/2005
23:54:10
| RE: P0171 will not leave
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yes I do get black soot coming out of the tailpipe. Not as bad now since o2 sensors and injectors were replaced. Still get it bad if I get into it from a standstill.
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Kowalski
GenIII
9/10/2005
09:33:44
| RE: P0171 will not leave
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I think its been posted that a bad TPS can set injector fault codes - hope that helps.
Lead, follow, or get out of the way
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ryan
Dodge Dakota
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9/10/2005
13:00:31
| RE: P0171 will not leave
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Do you think if TPS is bad I would get black soot from the exhaust?
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JerryM
Dodge Dakota
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9/10/2005
18:33:25
| RE: P0171 will not leave
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Ryan,
I got something for you to check. Last year my 2000 4.7 liter started running rich, intermittent engine codes, and also black soot coming from the tail pipes.
It's kind of crazy what it turned out to be. Right off the power steering pump discharge line is a two wire connector to a pressure switch. This switch blew (oil inside the connector) and leaked power steering fluid into the wiring harness and right down to the drivers side pre-cat o2 sensor. The sensor wiring and harness must be clear to get an accurate o2 reading. I replaced the pressure switch myself for about 15.00 and also replaced the o2 sensor and cleaned up the wiring. I think it's worth it for you to pop off the connector on the power steering line switch and check for fluid build up inside.
Sounds crazy but true. Also have seen other posts with same problem.
Good luck and let me know what you find.
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ryan
Dodge Dakota
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9/12/2005
01:11:14
| RE: P0171 will not leave
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Yes I had that switch go bad too. Replaced the switch and the pre cat o2 sensor. Didn't solve all my problems.
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davec
Dodge Dakota
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9/12/2005
14:41:09
| RE: P0171 will not leave
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You are definately dumping some fuel if you blow a cloud of black smoke out. Sounds like you may have an injector stuck open, although you said they were replaced. If it were me, I would remove the fuel rail with the injectors in place, disconnect your coil wire and turn the key to look at the fuel pattern coming from each injector. If you see one dribbling out a lot of fuel replace it. They should have a fine, even mist in a circular pattern. Next would be secondary ignition and the o2's. Good luck man...
Dave
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Kowalski
GenIII
9/12/2005
17:13:49
| RE: P0171 will not leave
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Did you check the TPS ? If it incorrectly reads wide open at light throttle that will call for more fuel too; and yes, that would cause the black soot from a rich condition.
Lead, follow, or get out of the way
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ryan
Dodge Dakota
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9/19/2005
18:34:07
| RE: P0171 will not leave
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I replaced the tps and reset the computer. It ran fine for a little while but then back to the usual. I'm just wandering if this code is stored into permanent memory and a dodge dealer will have to reset it.
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DB
Dodge Dakota
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4/13/2010
13:53:12
| RE: P0171 will not leave
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2001 Jeep Grand Cherokee 4.7L V8 134K miles P0171.
Just replaced Plugs, PCV and Fuel Filter. Left bank plugs 1.3.5.7 were severly carboned but dry. P0171 came back plus new P0300, P0301, P0303, P0305. Still idles rough in Drive. Next day only P0171 and runs smoother but still not right. 8 pre-10 post MPG. What's next?
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DEB
Dodge Dakota
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4/17/2010
11:16:45
| RE: P0171 will not leave
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YOU MAY WANT TO CHECK EMISSIONS HOSE . THIS SMALL HOSE IS UNDER THE TRUCK HALFWAY BACK IT IS U SHAPED AND CONNECTED TO A SMALL BOX . I HAD THIS GO BAD AND WAS DOING SAME THING YOU WERE TALKING ABOUT . ONE SMALL CUT OR HOLE AND TRUCK WAS RUNNING LIKE CRAPE AND CHECK ENGIN LIGHT WAS ALWAS ON HAD COMPUTER PUT ON IT FOR A CODE AND IT SAID IT WAS IN THE EMISSIONS SO BOUGHT NEW GAS CAP AND IT WORKED FOR A WHILE UNTILL A FULL TANK OF GAS GOT DOWN TO 1/4 TANK AND IT WAS BACK . SO I LOOKED UNDER TRUCK AND FOUND THIS HOSE WITH CRACKS AND WAS ROTTING AWAY REPLACED IT AND NO PROBLEMS
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GREG DANIELS
Dodge Dakota
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1/18/2011
20:49:09
| RE: P0171 will not leave
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2000 DODGE DAKOTA WITH V8 4.7.PO 171 LEAN CODE IN SYSTEM. SCAN TOOL READS THAT 1/1 O2 IS ALMOST 0. REPLACE FT. OXYGEN SENSOR HAD P/S FLUID IN CONNECTOR. CLEANED CONNECTION & REPLACE P/S SWITCH. STILL CAN NOT GET RID OF LEAN CODE.I DID CHECK VOLTAGE,GROUNDS & SIGNALS AT O2 SENSOR. CHECKED FOR VACUUM LEAKS, DID NOT FIND ANY. CLEANED INJECTORS WITH MOTOR VAC. DID NOT MAKE A DIFFERANCE. CAN ANYBODY HELP?
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Jeff Stivers
Dodge Dakota
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2/28/2011
19:33:28
| RE: P0171 will not leave
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Chasing the same problem on a 2000 R/T with 5.9L
V8. What did you find?
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GREG DANIELS
Dodge Dakota
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2/28/2011
20:48:43
| RE: P0171 will not leave
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2000 Dodge DAKOTA 4.7 ENG.power steering fluid in o2 harnass. replace right front oxygen sensor & cleaned harness connector. work perfect after that. warned customer harness may have to be replaced if vehicle check engine light came back on with the same code. (po171 lean code) The harness has been discontinue. hope that helps.
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motospike925
Dodge Dakota
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3/01/2011
19:28:14
| RE: P0171 will not leave
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a po171 ____ right rear fuel system lean a lean air fuel mixter has been indicated by an abnormal rich correction factor
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Jeff Stivers
Dodge Dakota
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3/02/2011
21:36:39
| RE: P0171 will not leave
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Same code still on our 2000 with the 5.9L, V-8, I do not see a power steering pressure switch on any schematic for the 5.9, maybe the engine coolant sensor or plugged/melted CAT? 142K on it. Coolant was a mess until recently flushed. PCM rebuilt and reflashed by A1 Cardone so we think it is ok. Check out the service manual from
http://www.pdfee.com/dodge-dakota-service-manual-2000.html
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