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Deadpool392Merc

Deadpo ... 10/11/2019

2016 Dodge Charger R/T 8 Cyl 5.70L

Engine

P0174 and P0300 after a few mods

I actually have a 2017 dodge charger Scat Pack 8 Cyl 6.4L, it just didn't come up as an option.
I had long tube headers installed in Houston at one shop and a PCM swap and lower hellcat intake box at another shop on October 1st. Started throwing a CEL on the way to the second shop in Houston but I thought it was just because it needed a tune. I live in San Marcos so by the time I got to Luling, it was throwing a P0174:
Rough idle
High fuel consumption
Misfiring
Hesitation
Late that night I installed a tune from Flying Ryan. Ran decent after that until the next morning when it threw P0174 again. October 5th took to a local shop who due to Saturday hours couldn't do much. They tightened down the headers. Ran a little better for an hour then threw code again. October 6th it started throwing P0300 as well. Went back Oct 7 and had Bank 2 Sensor 1 O2 sensor replaced. Ran beautiful for 32 hours then threw P0174 again. Today it just started P0300 again and rough idle and misfiring like

3 Answers


Jimm

Jimm 10/11/2019

P0174 = System Too Lean (Bank 2)

A code P0174 may mean that one or more of the following has happened: The MAF (Mass Air Flow) Sensor is dirty or faulty (if equipped). Note: The use of "oiled" air filters can cause the MAF to become contaminated if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. There could be a vacuum leak downstream of the MAF sensor Fuel problem (rail/injectors/pump/regulator)

Possible solutions include:
In many cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling Inspect all vacuum and PCV hoses, replace if necessary Check for a dirty fuel filter and proper fuel pressure.

P0300 = Cylinder Misfire (random cylinders)
It may mean that one or more of the following has happened:

Engine vacuum leak
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective engine control computer (ECM or PCM)

Possible Solutions

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.





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Jimm

Jimm 10/11/2019

P0174 = System Too Lean (Bank 2)

A code P0174 may mean that one or more of the following has happened: The MAF (Mass Air Flow) Sensor is dirty or faulty (if equipped). Note: The use of "oiled" air filters can cause the MAF to become contaminated if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. There could be a vacuum leak downstream of the MAF sensor Fuel problem (rail/injectors/pump/regulator)

Possible solutions include:
In many cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling Inspect all vacuum and PCV hoses, replace if necessary Check for a dirty fuel filter and proper fuel pressure.

P0300 = Cylinder Misfire (random cylinders)
It may mean that one or more of the following has happened:

Engine vacuum leak
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective engine control computer (ECM or PCM)

Possible Solutions

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.





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0
Deadpool392Merc

Deadpool392Merc 10/12/2019

We've had two separate shops do a complete diagnostic. First one replaced Bank 2 Sensor 1 02 because it was giving voltage readings all over the place but nothing else found. Second one could not find anything at all, no vacuum leaks, no exhaust leaks, all parts are in excellent condition. Long tubes are catless. They suggested either a bad tune or a bad PCM. Had our tuner look into his tune again and he says nothing he did affects the separate banks. So we're calling Diablo Monday morning.

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