2005 hemi- misfire - no power

[NoAlternative8188]

Hey guys - I just bought this 2005 1500 Hemi 5.7 with 186k. The truck ran fine about 2 weeks ago. The original owner had a cherry bomb exhaust on the truck so I cut it off and since then it has developed this issue. I tried starting it the other day with no exhaust on it and now it runs like crap. It misfires, has no throttle response and will occasionally stall. I can smell fuel as well so it's definitely running rich.

The codes are
p0202
p0203
p0208
p2323

When I first bought it, it only had codes p0137 and p0157. The owner said It most likely needed o2 sensors and maybe cats, which I was planning on changing on my own.

However I'm not sure where to start with this issue. It's been a while since I've dove into an engine like this so any advice on troubleshooting would be greatly appreciated. Besides the old exhaust the truck is stock.

Here's a video of it running.. barely

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[LoneWolf3574]

The first 3 are injector 1, 3, and 8 malfunctions and the last is a failure of coil 8. Check your harness for breaks and rubs on those wires. That or Fievel found those wires rather tasty.

P0202 Dodge: Code Meaning, Causes, Symptoms, & Tech Notes

Engine Control Module (ECM) checks the injectors circuit resistance and monitors the voltage drop during normal operation. The ECM will trigger the P0202

www.engine-codes.com

P0203 Dodge: Code Meaning, Causes, Symptoms, & Tech Notes

Engine Control Module (ECM) checks the injectors circuit resistance and monitors the voltage drop during normal operation. The ECM will trigger the P0203

www.engine-codes.com

P0208 Dodge: Code Meaning, Causes, Symptoms, & Tech Notes

Engine Control Module (ECM) checks the injectors circuit resistance and monitors the voltage drop during normal operation. The ECM will trigger the P0208

www.engine-codes.com

P2323 Dodge: Code Meaning, Causes, Symptoms, & Tech Notes

The current flow, or dwell, through the primary ignition coil is controlled by the Powertrain Control Module (PCM) by providing a switched ground path

www.engine-codes.com

The P0137 and P0157 are post-cat open circuit codes, so I'm guessing you have no catalytic converters. You are going to run rich because the PCM is not receiving any data from the post-cat O2 sensors.

P0137 Dodge: Code Meaning, Causes, Symptoms, & Tech Notes (With Video)

The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst

www.engine-codes.com

P0157 Dodge: Code Meaning, Causes, Symptoms, & Tech Notes (With Video)

The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst

www.engine-codes.com

 

[NoAlternative8188]

Thanks for your feedback. I dove into the truck the other night and found an issue to start with! Looks like Fieval was living like a King.
The Throttle boddy wires are chewed badly and I do not have a photo however the main wiring harness that feeds all coils/plugs has been chewed at the main connection. (will post a photo later)
How would you recommend fixing this? Replacing the whole wire harness with a used one? If so do you have any clue where I could find one? Maybe a junk yard

As far as the cats go... the truck does have cats installed. Not sure where to go from there. Maybe new o2 sensors, or would I need to just replace the cats altogether?

 

[NoAlternative8188]

update incase anyone else runs into a similar issue... I replaced the wire harness, and the throttle body itself was shot. Also changed the intake gaskets which were worn. Truck runs like a charm.

Just need to fix the o2 sensor now.