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Brett
Dodge Dakota
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2/11/2010
15:01:54
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 Subject: 2000 4.7L sooty exhaust bad gas mileage
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I have a 2000 4.7L Quad Cab 4x4. My check engine light came on and I have started only getting about 8-9 miles to a gallon (down from about 17). I made the mistake of taking it to a mechanic who told me the O2 sensors were bad and needed to be replaced, this did not fix the problem. Does anyone have any suggestions? Any idea how many O2 sensors there are?...mechanic told me 2 but that didn't seem right? Thanks in advance!
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daddio
Dodge Dakota
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2/11/2010
17:32:23
| RE: 2000 4.7L sooty exhaust bad gas mileage
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First off, Is the CEL still on? If not check for codes anyway and post them here. You can check them yourself by turning the key on/off/on/off/on(by "on" I mean "on" not "start"). and the codes will display in the odometer as PXXXX and when it's finished or there were no codes it will display Pdone.
It could be the power steering pressure switch leaking into the wiring harness and causing a false O2 sensor code. It's been posted about on here before.
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Brett
Dodge Dakota
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2/11/2010
17:42:58
| RE: 2000 4.7L sooty exhaust bad gas mileage
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The check engine light is still on. I tried the "on, off, on, off" technique but no codes popped up in the odometer...is there a certain number of times I have to do it, or a certain amound of time to wait between the on/off/on transition? If not I will have to take it to auto zone and get them to read it.
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Brett
Dodge Dakota
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2/11/2010
17:50:37
| RE: 2000 4.7L sooty exhaust bad gas mileage
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Correction, after a second attempt I was able to get the P-codes, I had never heard of that before but it worked great, my apologies....the P-codes are as follows, and there are a lot
P0133
P0138
P0141
P0171
P0551
Any help/advise/ideas are greatly appreciated
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Long Time Reg
Dodge Dakota
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2/11/2010
19:35:01
| RE: 2000 4.7L sooty exhaust bad gas mileage
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Your Codes
P0133 HO2S Slow Response Bank 1 Sensor 1
P0138 HO2S Circuit High Voltage Bank 1 Sensor 2
P0141 HO2S Heater Performance Bank 1 Sensor 2
P0171 Fuel Trim System Lean Bank 1
P0551 Power Steering Pressure Sensor Circuit
Range/Performance
& with the last code being proof of what daddio
said above
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Long Time Reg
Dodge Dakota
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2/11/2010
19:37:16
| RE: 2000 4.7L sooty exhaust bad gas mileage
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Get that pressure switch changed
and the O2 Wires/Plugs cleaned
(Maybe brake parts cleaner)
that fluid is going to be a real B*tch to clean off
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Brett
Dodge Dakota
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2/11/2010
19:42:53
| RE: 2000 4.7L sooty exhaust bad gas mileage
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Long Time Reg and Daddio:
Thanks for the advise, I hadn't imagined that any of this was going to be easy. Do you think it would be better to just replace the O2 sensors as opposed to tring to clean them? I had thought about trying to clean the O2 sensors before but wasn't sure what to use, and the guy at Autozone had no idea...so break cleaner should do the trick?
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daddio
Dodge Dakota
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2/11/2010
20:21:18
| RE: 2000 4.7L sooty exhaust bad gas mileage
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You do not need to clean the O2 sensors. Did you read all of my post?
You will need to change that power steering pressure. When you remove it, clean all of the power steering out of the wiring harness. Then disconnect the O2 sensor on that side and clean the connector. You can use contact cleaner which should not harm the wiring or connectors at all. You need to make sure they are thoroughly cleaned.
Install the new pressure switch and reconnect everything and you should be good to go. You can reset the PCM snd remove the codes by disconnecting the positive cable from the battery and turning the key to start for about a minute. Then reconnect the battery and start the truck up. It may idle a little a weird until the PCM relearns the idle settings.
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brett
Dodge Dakota
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2/11/2010
21:49:12
| RE: 2000 4.7L sooty exhaust bad gas mileage
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My apologies, I don't think I quite understood the first time....makes perfect sense now. Thanks for the help, I will let you know the outcome.
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Long Time Reg
Dodge Dakota
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2/11/2010
22:00:00
| RE: 2000 4.7L sooty exhaust bad gas mileage
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I worded that wrong.
Use the cleaner to get the fluid off wires/plugs
I see not it reads wrong,
Hey be sure to give us an update
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Ron
Dodge Dakota
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2/14/2010
12:06:09
| RE: 2000 4.7L sooty exhaust bad gas mileage
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trying to take of front drive shaft but the four bolts on the front are very very hard to turn.should i heat them some?
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WD 40
Dodge Dakota
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2/14/2010
12:26:04
| RE: 2000 4.7L sooty exhaust bad gas mileage
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I would spray them
WD 40 or Liquid wrench let it set and do again.
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wvdak
Dodge Dakota
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2/15/2010
18:10:13
| RE: 2000 4.7L sooty exhaust bad gas mileage
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i also have a 2000 with a 4.7 i did that code trick and it gave me p1491 this code is not in the book i have does anyone know what this one is
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daddio
Dodge Dakota
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2/15/2010
19:24:37
| RE: 2000 4.7L sooty exhaust bad gas mileage
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P1491 Rad Fan Control Relay Circuit (Chrysler, Jeep)
You guys that are jumping all over this thread know that you can start your own thread and get quicker responses right?
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matthew
Dodge Dakota
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1/23/2012
12:24:54
| RE: 2000 4.7L sooty exhaust bad gas mileage
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How do I clean the transmission/drain/replace on my 4.7
2000 dakota, I hit 191000 today
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JerryM
Dodge Dakota
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1/24/2012
02:09:51
| RE: 2000 4.7L sooty exhaust bad gas mileage
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Brett,
Daddio has a good suggestion, as it happened some years ago to my 2000 4.7 liter. Took some time to figure out. Here is what happens:
Check you PS fluid reservoir. If it is low, the power steering high pressure switch blows, leaks fluid to the drivers side pre cat O2 sensor and fouls it causing issues like you have. I replaced the PS switch, cleaned the sensor with carb cleaner, and wiped fluid from wiring. No more issues, and good luck!
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