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Lance Bell
Novice
Dec 11, 2015, 7:43 PM
Post #1 of 13
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2005 Dodge 1500
4.7 v8, 133,000 miles
Ok so early in the year the motor blew so I took it to a shop and had a new re-maned motor put in, we had some o2 sensor problems but got them ironed out. But then it threw a, MAP (max absolute pressure) sensor code, I had the parts store check it and the mechanic who put in the motor just to double check, he said fuel pump. I swapped the sensor and it was fine then started laughing a bit and kicked the MAP sensor again. I can't see a sensor going out in 3 weeks but I don't think it's a fuel pump either.
Any help or suggestions please, this is the only rig that we all fit in and we're needing to to head to the in-laws in a week and I don't have the money for another mechanic bill so any help would be great thanks. Lance
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Dec 12, 2015, 2:45 AM
Post #2 of 13
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Re: Need help, mopar
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Not much credible in any of this except a mechanic told you the fuel pump so would be checking fuel pressure.
MAP and more - probably connections as just taking out engine and replacing it disturbs a lot.
Check the fuel pressure and go from there,
T
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kev2
Veteran
Dec 12, 2015, 6:48 AM
Post #3 of 13
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Re: Need help, mopar
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scan for codes post ALL codes here someone will advise. that is easy and FREE
advice - Costly mistake? a code never says a part is bad SO changing the MAP (manifold absolute pressure) may have been unnecessary.
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Discretesignals
Ultimate Carjunky
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Dec 12, 2015, 7:35 AM
Post #4 of 13
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Re: Need help, mopar
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Kev is right! Need the trouble code number for the MAP. Sometimes if the engine is running bad, it can trigger a MAP performance/correlation code. Just because the code description has MAP sensor in it, doesn't necessary mean the MAP sensor itself is the fault.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Dec 12, 2015, 7:36 AM)
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Lance Bell
Novice
Dec 12, 2015, 8:04 AM
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Ok, if/when it kicks again I'll get the code number and post it. My buddy said there new code reader will pin point problem unlike the old one that was more a ball park. I do remember it said it was lean in bank 2. Thanks for the help
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Lance Bell
Novice
Dec 12, 2015, 10:26 AM
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The code on the tester at auto zone is P0174, the print out says fuel trim bank 2 condition, the ecm has detected a rich or lean air/fuel ratio on bank 2.
Probable cause. If bank 1 an 2 are set together suspect a pressure condition or MAP sensor failure , a heated oxygen sensor
Ignition misfire
Fuel injector problem
Engine mechanical condition.
That's everything on the print out I got.
When it happens it lugs lightly like it loses power, could it be a bad wire seeing how it comes and goes. I change the oil regularly, I run good injector cleaner thought it I buy good gas, so its not cause the truck has been neglected. Thanks Lance
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Discretesignals
Ultimate Carjunky
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Dec 12, 2015, 11:58 AM
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P0174 is a lean condition on bank 2 of the engine.
You really need to see how it is running lean by watching your long and short term fuel trims at different engine loads and speeds. Your probably not savvy with drive-ability or have the tooling, so you may need to have an experienced drive-ability tech check it out.
Misfires from not enough fuel, ignition problems, or mechanical issues can cause lean conditions because the oxygen that isn't used by the combustion process during the misfire goes right into the exhaust.
Vacuum leaks can cause a lean condition if they are big enough on speed density fuel management systems.
You could have a stuck lean o2 sensor. You can compare the post cat sensor or do an O2 function test to figure that out.
An exhaust leak before or around where the sensor is can cause it to register lean.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Dec 12, 2015, 12:01 PM)
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kev2
Veteran
Dec 12, 2015, 12:05 PM
Post #8 of 13
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Re: Need help, mopar
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p0174 is lean condition.
check fuel pressure - use a gauge let us know.
check for a vacuum leak - use the old spray trick easy and inexpensive.
PS: Tell us any modifications or use of aftermarket parts.
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Lance Bell
Novice
Dec 12, 2015, 12:36 PM
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No after market parts or modification 's she's all stock, spaying brake cleaner around the manifold didn't do anything. When the motor was swapped and I got it back it threw a lean o2 senor code all 4 sensor's were replaced with Mopar o2 sensor's. When it did that there was no lugging or power loss. On old stuff I do ok but on newer rigs with computers and a million sensors I am a fish out of water. I will check fuel pressure as soon as I can.
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Discretesignals
Ultimate Carjunky
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Dec 12, 2015, 1:07 PM
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Let me add something. Think for second. If you had a fuel volume/pressure issue causing the engine to run lean, wouldn't you see that both banks are lean? The fuel rail does feed both sides of the engine.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Dec 12, 2015, 1:08 PM)
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Lance Bell
Novice
Dec 12, 2015, 2:45 PM
Post #11 of 13
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Discretesignals, please dumb down your post that was over my head. On the second one I understand I think what your saying but I am pretty sure its not a vacume issue all that was ran through when the o2 sensors were replaced. I don't know if it was shody work or what. But it was speratic but becoming more common. I have put almost 100 miles on the truck today and its hitting more common. That's what had me thinking bad wire maybe. Thanks for the help everyone.
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Lance Bell
Novice
Dec 17, 2015, 6:21 PM
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Checked for vacume leak and nothing changing the throttle control sensor tomorrow and if that don't work I'll put i n a new fuel pump.
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Discretesignals
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Dec 18, 2015, 5:31 AM
Post #13 of 13
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Did you take a fuel pressure/volume check? Like I mentioned if you had a fuel pump issue causing a lean condition, you would see it on both sides of the engine. Someone needs to hook up a scan tool and watch long and short term fuel trims. I wouldn't just throw parts at it.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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