Acceleration problems

Tiny
MONKEYS69
  • MEMBER
  • 2001 DODGE DAKOTA
  • 2.5L
  • 4 CYL
  • 2WD
  • MANUAL
  • 134,000 MILES
I just bought this truck it starts right up idles and revs just fine but when I put it in gear and go it jerks and pops. If I just press the gas it does nothing if I feather it I can keep it running barely. I put a new o2 sensor, map, and TPS sensors. I suspect possibly a fault in the harness. Because I am still getting code for the o2 sensor and MAP.
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Tuesday, May 30th, 2017 AT 10:18 AM

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Tiny
CARADIODOC
  • EXPERT
Please list the exact fault code numbers. There are over a dozen for each sensor, and they mean very different things with different diagnostic procedures.
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Tuesday, May 30th, 2017 AT 11:43 AM
Tiny
MONKEYS69
  • MEMBER
P0107 and P1236 are the codes I keep getting I've checked the voltage at the map sensor and it's receiving 5v. It also comes back with a ho2 bank 1sensor 2 low Voltage once in a while. It also has a new pcm
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Thursday, June 1st, 2017 AT 3:33 PM
Tiny
MONKEYS69
  • MEMBER
Also it seems to run better when I disconnect the map until it warms up Then starts sputtering again and dies
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Thursday, June 1st, 2017 AT 3:36 PM
Tiny
CARADIODOC
  • EXPERT
P0107 - Manifold Absolute Pressure/Barometric Pressure Circuit Low Input

The MAP sensor has the biggest say in fuel metering calculations. A signal voltage that's off by as little as 0.1 volt will have a big effect on engine performance. As with most 5.0-volt sensors, the acceptable range of signal voltages is between 0.5 and 4.5 volts. Code 107 means the Engine Computer is seeing less than 0.5 volts. When you unplug the sensor, that is also detected, and the computer "injects" its own value to run on. It picks that value by looking at other sensor readings and operating conditions. The engine will run better, but not perfectly.

Most sensor circuits use a pull-up resistor to force the signal wire to go to 5.0 volts if it is cut or has some other break. That sets a different fault code for "MAP voltage too high". Most of the time the only way to get a "voltage low" fault code is for the signal wire to grounded. Inspect the wiring harness first, especially where it lays on the sharp edge of a metal bracket or where it rubs back and forth on the inner fender.
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Thursday, June 1st, 2017 AT 4:47 PM

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