The following is from the "Check Engine light" diagnostic: Cylinder misfire detected #2 cylinder. Ignition Coil Vacuum leak Large Vacuum Leak
What was the diagnosis-- misfire-- lean condition
SOURCE: diagnosed with ignition coil problem,
2006 3.9 has to be a T-Bird or LS
There are no spark plug wires
It has Coil-On-Plug individual coils
Plugs don't fail --they get changed at 60,000 miles
give or take,say every 3 years
The front (2) O2 Sensors get repalced at 100,000
miles. The ones closest to the engine
Clean MAF Sensor at least once a year
I have no idea how you inspect a pcm,if your
at home & have no scanner or PC Based Software
Egr Valves fail early on those & other fords
You could test,not look at,actually put an oscilloscope
on the TPS Sensor
Any oil on a spark plug requires a new valve cover gasket
If a coil was replaced based on a code alone,you may have
replaced a good one,not what needed to be replaced if any
SOURCE: 2005 gmc envoy runing rough po302 i replace plugs and "2 coil now po300 runs rough
have you replaced the fuel filter. also check the battery new cars use a lot of power and that could cause a random misfire code. if those are all good then check for a vacumm leak. you can do that with carb cleaner by running the vehicle and spraying around the intake manifold or vacumm lines and listen for a change in the motor
SOURCE: what causes 2000 taurus engine rough idle but no codes
I had a head gasket going when I have a rough idle. Just weeping coolant past the number 1 cylinder. When I pulled the head the piston was all shiny and steam cleaned. $500 dollars all good now.
SOURCE: engine running rough why?
Might be a bad vacuum line, check all vacuum lines for cracks or dry hose and replace as needed
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