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Loss of power

Tiny
BUDD97
  • MEMBER
  • 2003 DODGE NEON
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 76,000 MILES
I replaced, timing belt, water pump, tensioners, pulleys, intake gasket, tune up, MAP sensor, coolant temperature sensor, TP sensor, new transmission filter, and fluid, radiator, and cam position sensor. All pretty much when I got the car for my wife, and we just got the car. It just started acting like it doesn't want to accelerate when I press the gas and starts to slow down. When I let off the gas and press it again it will start speeding up. At idle it will start to run rough then act like its about to stall then catch its self. I have a bank 1 sensor 1 code, transmission pressure sensor code and I think 2 transmission gear out of sync codes I believe and a few more codes related to the transmission. I can get the actual codes if anyone needs them I'm trying to figure out if a 02 can cause this, but the o2 looks new and puts out the correct voltage. Or is the problem related to a transmission output sensor or control module? I am a mechanic and went to school to be one but to be honest I'm just starting out and still learning and my electrical diagnosing skills could use some sharpening up, it was always a hard subject for me to learn. Does anyone have any ideas or advice on were to start and how to go about diagnosing?
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Wednesday, February 13th, 2019 AT 4:52 PM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

I would do a couple of checks first to be sure the other systems are correct.

1. Check the compression to be sure there is no internal damage.

https://www.2carpros.com/articles/how-to-test-engine-compression

2. Check the catalytic converter. It may be clogged not allowing the engine to breathe.

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

3. Verify actual fuel pressure.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Roy
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Thursday, February 14th, 2019 AT 4:56 AM
Tiny
BUDD97
  • MEMBER
  • 3 POSTS
Hello, compression is good, catalytic converter is good, fuel pressure is good. I found the output speed sensor bad and replaced. It runs better but now I have a po134 and po132 code, and the car bogs down around thirty miles an hour, if I let off the gas and press it again it speeds up no problem. It only does this when driving at low speed 30 to 40. But it doesn't always do this. When its cold its fine problem starts when the engine is warm but doesn't do it every time I'm at low speed. Sometimes I can drive for a bit and its fine but after fifteen to twenty minutes it will start now and then. Can a upstream o2 cause a problem like this? I have never know one to do this though. At idle both o2s seem to work and put out the voltage there suppose to.
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Friday, February 15th, 2019 AT 10:56 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Got it. I wish you would have given me numbers. Okay is not good for me.

Anyway 132 below. Looks like a wiring issue with the O2 sensor.

Roy

P0132
Descriptor
1/1 O2 Sensor Shorted To Voltage
O2 Sensor 1/1 Voltage High
Probable Causes
Intermittent Condition
Oxygen (O2) Sensor
Oxygen Sensor (O2S) Above 3.7 Volts
Oxygen Sensor (O2S) Ground Circuit Open
Oxygen Sensor (O2S) Operation
Oxygen Sensor (O2S) Return Circuit Open
Oxygen Sensor (O2S) Signal Open
Oxygen Sensor (O2S) Signal Shorted to Voltage
Powertrain Control Module (PCM)
Powertrain Control Module (PCM) Return Circuit
Powertrain Control Module (PCM) Signal Circuit

134 is for O2 staying at center. Possibilities below but also could be from clogged cat converter.

Roy

P0134
Descriptor
1/1 O2 Sensor Stays At Center
Probable Causes
Intermittent Condition
Oxygen Sensor (O2S) Ground Circuit Open
Oxygen Sensor (O2S) Ground Circuit Voltage Drop
Oxygen Sensor (O2S) Operation
Oxygen Sensor (O2S) Signal Circuit Voltage Drop
Oxygen Sensor (O2S) Signal Open
Powertrain Control Module (P
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Friday, February 15th, 2019 AT 12:49 PM
Tiny
BUDD97
  • MEMBER
  • 3 POSTS
The funny thing is that it only does this when I clear the code then when it happens and once the engine light comes on the car drives fine. How do I check the wires to the o2?
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Friday, February 15th, 2019 AT 1:45 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, first clearing codes does nothing. All it does is make the ECM forget the code until it sees the same readings and set the light again.

The reason for the engine to run different is the ECM puts a good value in for the bad values so it runs well until you get it fixed.

https://www.2carpros.com/articles/how-to-check-wiring

Roy
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Friday, February 15th, 2019 AT 2:03 PM

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