Monday, April 29, 2013

1998 Dodge Dakota/ Obd Codes P300,P301,P303,P305,

Dodge OBD Codes P300,P301,P303,P305,


1998 Dodge Dakota Problem:

1998 dakota 3.9, get 4 codes p300,p301,p303,p305, with a loss of power no rough run, mostly shows up between 1/2 to full tank. 

AutoParts replaced are both heads checked out being cracked, pcm (dodge) spark plugs, cap,rotor, wires,coil, this code has been coming up since before any repair has started,after I replaced the heads  the codes came back, I also replaced the evap solenoid on the fire wall, any thoughts.
Vehicle is run 132,000 miles



Possibly Of Fuel Level:

If it truly is correlated to the fuel level being higher then it could be happening because liquid fuel is being pulled into the evaporative emissions system. If the rollover valve on the tank is allowing liquid fuel to be pulled into the canister and evap system it will cause the engine to run rich. 

Options To Be Tried:

You can try removing the purge solenoid's vacuum line off at the intake and capping the nipple and then see if the problem goes away. 

Another Possibility Can Be Fuel Injectors:
You could have an injector issue. At out Auto repair garage we see lots of these trucks with debris plugging the injector inlet screens. The fuel line comes into the rail on the same bank as all the misfire codes are setting on, these three cylinders are the ones you would expect to have problems with if there was debris coming in from the line.So check the injectors.

Reasons for Cylinders To Run Lean:

On the bottom of the intake is the plenum pan which seals to it with a paper gasket. These were troublesome and the gasket would suck out in sections between the bolt holes. If the gasket was sucked out it could cause some cylinders to run lean and it can also cause oil to be pulled out of the valley and be burned in the engine. If the plenum pan gasket wasn't replaced when the intake was off this could be part of your issue.
So get the plenum pan gasket inspected.

Getting this suggested possibilities checked will help
Thanks.

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