i have an 01 dakota 4.7L 4x4 quad cab and i noticed about 2 weeks ago that when i go up a hill and give a little more gas to power up the hill it hesitates sometimes and runs a bit rough and slows down until i kick down and floor it to power through the hesitation/rough idle. after the initial shudder it will come and go at steady highway speeds and my truck will slow and then kick back to normal after a few seconds.

i also receive a check engine light at that time aswell the second i feel the shuddering. the check engine light goes away after a day or 2 and will come back in a day or 2.

the check engine light codes are
p0152 - 02 sensor circuit high voltage bank 2 sensor 1
p0138 - 02 sensor circuit high voltage bank 1 sensor 2

i had an 02 sensor go a couple months ago and i had 2 engine codes both saying the same bank and sensor and my brother(a truck mechanic) said that if i have 2 codes for the same sensor it will most likely be that 02 sensor(which it was and is now fixed), but if i ever have codes for multiple 02 sensors, it would most likely be a something controlling multiple sensors.

this brings me to the question of what could this be?
PCM? ground/short? MAF? fuel pressure? vacuum?\

thanks for any info

 

the more i read up on this problem the solutions to me seem to be MAP sensor or PCM because of the high voltage with 1 or more O2 sensors.

anyone confirm?

 

Check your power steering pressure switch for leaks. Then, pull the connector on the PCM and look for power steering fluid there. Finally, look at the 02 sensor harnesses themselves.

There are known problems with oil migrating along the wiring and causing codes indicating 02 sensor problems.

 

the PCM is very clean and all connectors are spotless with no corrosion or oil on them. the o2 sensor wires are not on any exhaust and are fully intact and connected properly with clean connections.

1 of the o2 sensor codes is a brand new 02 sensor that i put in about 1 month ago.

i was gonna try to put in a MAP sensor to try just incase because they are pretty cheap and easy to replace but, they are into my plastic intake and when i try to loosen the bolts they just spin from inside the intake and i cannot remove them without removing the intake if i can even get into my intake with it off of my truck.

I unplugged my Map sensor and drove to see if the problem is still happening(if it was then the problem probably wont be a MAP sensor?) and it still happened along with my truck wanting to stall on idle.

 

What brand O2 sensor did you put in?

For some reasons Dakota's hate Bosch.

 

no not a Bosch. the brand of O2 sensor is Prime Choice i bought off Ebay.

if it was just that sensor giving a warning i would think it could be the o2 sensor itself. but with 2 sensors and the voltage fluxuating a lot on idle when my brother put his scanner up to it it sounded to me like something which could control the voltage of the O2 sensors from opposite banks giving 2 different sensors the code of high voltage.

 

First thing. What emissions package do you have? In other words, 2 or 4 O2 sensors?

I'm thinking 4 by the codes but want to be sure.

High voltage means the mixture is rich. It could be a vacuum leak or a MAP sensor. Do you have a vacuum gauge to check?

 

yes i have 4 o2 sensors. 2 pre-cat and 2 post-cat

i believe i can get the vacuum tested from my brother ill try it.

i tried to remove my MAP sensor but the screws just spin. its beside my a/c unit at the front of my engine into my plastic intake. i was gonna remove put a new one it but it seems to be giving me problems. i may have to pry outwards and unscrew at the same time but i dont know if it has a nut on the end and will never pull through? or if it just has stripped threads?

if its not a Vacuum leak then good chance it would be MAP sensor?

 

I can't say for sure it would be the MAP sensor.

The weird thing is that on bank one it's the post cat, and on bank two, the pre-cat that are acting up. I would expect to see both pre-cats to read "high"

The bolts are stripped? It may be causing a leak. There is an o-ring there to seal the map sensor to the manifold.

 

the threading in the plastic intake is stripped. i can unscrew but it wont unscrew itself outwards to be removable.

it only read both o2 sensors once and ive checked my engine light a few times after and its only saying the new o2 sensor is having high voltage warning. im guessing because the new o2 sensor will be the most sensitive?

is it worth putting some casket sealer over my bolts and the seam to see if it goes away? it still feels tight but i guess any little bit can throw it out