Question about 2004 Ford F150

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Just replaced coils&plugs on my f-150 now the truck is running to lean, code said o2 sensor replaced that and still have the same prob the truck idels fine but when in gear it knocks and pings and wont go

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I would double check the wire as they may have gotten out of order when you were replacing the coil and plugs

Posted on Jul 19, 2010

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I have a 2008 Mercury Mariner V6 Premier 4x4. It is running very rough and makes a deep popping noise at idle. I had it connected to a computer. The computer says, misfire #4 and lean. I have changed the...


Smoke Test the intake manifold

When the Spark Plugs were replaced,
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You either have a misfire on a coil that
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I may have mis read what you said.

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1999 vw jetta 2.0


Sounds like two problems. P0300 and P0303 are possibly spark plugs. They could be a coil pack but I'm leaning toward a spark plug problem because of the other two codes - they're indicating O2 sensor problems. If the O2 sensors are screwed up, the car reverts to preprogrammed, rich fuel maps that send excessive fuel through the engine. The reasoning is, if the ECU can't trust the O2 sensors to determine how much fuel to burn optimally, it'll pump a bunch of extra fuel through the engine to keep it safe. Having too little fuel (aka running lean) can destroy an engine, so the ECU plays it safe and runs rich (too much fuel) instead. The consequences of rich running are relatively minor compared to lean running, but can and do tend to create excessive carbon buildup on the catalytic converter and O2 sensors, as well as fouling spark plugs.

First thing to do though is to swap the wires on your coil packs and see if you end up with a misfire code for the same cylinder #3. If you do, then it's the plug or wire. If it moves, it's the coilpack. Replace whichever part is faulty. You'll probably need oxygen sensors too, before you can clear all the codes.

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