codes: misfire, front bank

[BodybyFisher]

OK, duh, I just read that you tried a new coil pack..... Let me research that to see if you have some sort of a control module, ill come back later

Maybe someone will chime in

[BodybyFisher]

Here is a list of things to check for a P0300

Check the affected bank for a loss of ignition module assembly power and/or ground.

Check for the following conditions:

• Incorrect CKP System Variation data stored in the PCM. Run the CKP System Variation Learn Procedure using the scan tool.
• System grounds -- Ensure all connections are clean and properly tightened.
• Damaged accessory drive belt or driven accessory -- A damaged serpentine belt or belt driven accessory can cause engine load variations sufficient to set a misfire DTC.
• Fuel pressure -- Perform a fuel system pressure test. A malfunctioning fuel pump, plugged filter, or malfunctioning fuel system pressure regulator will contribute to a lean condition. Refer to Fuel System Pressure Test .
• Fuel injectors -- Refer to Fuel Injector Coil Test - Engine Coolant Temperature (ECT) Between 10-35 Degrees C (50-95 Degrees F) or Fuel Injector Coil Test - Engine Coolant Temperature (ECT) Outside 10-35 Degrees C (50-95 Degrees F) .
• Contaminated fuel -- Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
• Extended Idle -- Excessive open loop operation caused by extended idling or short trip driving may leave deposits on the heated oxygen sensors. The deposits cause oxygen sensors to respond slowly to exhaust oxygen content, affecting fuel control and causing a misfire to be indicated at idle. This condition is not permanent. To determine if this condition is causing the DTC P0300 to be set, review the freeze frame and failure records data for DTC P0300. If the DTC P0300 occurs at high engine speeds, the condition described above did not cause the DTC P0300 to set. If the DTC P0300 occurs at idle or very low engine speeds and at engine coolant temperatures below 80°C (176°F), the condition described above is very likely the cause of the DTC P0300 being set. The deposits on the heated oxygen sensors can be eliminated by operating the vehicle fully warm at mass air flows above 15 g/s.
• Running the vehicle low on fuel -- This DTC may set if the vehicle misfires while running out of fuel. If no misfire is currently present, but the History Counters indicate random misfire was once present, ask if the vehicle has been run out of fuel. If this is the case, no further repair may be necessary.
  Important:
  Incorrect CKP System Variation data in the PCM may cause DTC P0300 to set with no apparent misfire. Any of the following conditions can cause incorrect CKP System Variation data:
  • Replacing the engine
  • Replacing the PCM
  • Reprogramming the PCM
  • Replacing the CKP sensor
  • Performing internal engine repairs that affect the CKP sensor to crankshaft reluctor wheel relationship

  If any of the above conditions apply to this vehicle, the CKP System Variation Learn Procedure must be performed before proceeding with misfire diagnosis.

[BodybyFisher]

Check your FUEL INJECTOR FUSES and SOCKETS, INJ1 and INJ2 for corrosion and continuityand power

[Ranger]

Here is where I am now. I have narrowed it down to the connector to the coil pack. When it is running rough pull the connector, no difference, plug it back and jiggle it and it catches and runs smooth. My question is there another connector upstream that I need to worry about? I just noticed a little backfire poof sound from exhaust when idle rough? This lousy little seven pin plastic connector..........cost $$$$$$95 bucks!!!!!!!!!! There is only one in town!!!!!!! Before I run off and buy this.......can anyone think of anything else this could be. ...again, many thanks.......dj

I can't picture that exact connector, but I have had luck before by pulling the wires from the connectors and spreading the contacts to get a better connection and then reinstalling them.

[donljacobs]

I found a connector, only one in town..........$96........carefully soldered it in...then plastic coated and DOES NOT WORK. Same symptoms. I have not checked ground, don't know where they are? I believe it is electric. I will check fuses also. When the CKP has an issue, don't you just stop, no start, nothing? Again, Car starts with touch of key, idles for about 2 minutes and goes rough, if you let it sit, it will smooth out and go rough again. Sometimes on take off, it will start rough and then immediately catch, sometimes it will shutter for a minute or two and then catch. You can hardly tell anything at Hwy speed. Anymore ideas, I really thought connector was it. Again recent repairs are new head gaskets, done right, and rack and pinnion. The symptoms started just before i took in for head gaskets......I thought maybe the connector got fried by heat.........Thanks again........I got to have a car for work, new job, and I am about to dump this, I have to have a car.

[KHE]

He did not put freon back into AC ...do they undo brake lines when they drop engine? My brakes are pulling wildly, like need bleeding......

Evacuating and recharging the A/C should have been part of the job. If the compressor would have been wired out of the way, discharging the system would not have been necessary...

If the entire powertrain was dropped to do the headgaskets, it is possible they did not bleet the system. It is also possible a caliper is hanging up. If it pulls to the right, check the left caliper.

[donljacobs]

I bled brakes, check calipers, full peddle, acts like I am on ice.........thanks