2009 Ford Crown Victoria Ignition Coil Packs

 

2009 was the last year Ford used the designation P71 on the VIN for Police interceptors and fleet vehicles. The next year the numbers were specific to whatever the vehicle was ordered as instead of P71 used for all fleet vehicles (non civilian cars). The 2v 4.6L V8 was still shared in all of these Crown Victorias, and all of these 4.6L V8 engines used the same DG508 ignition coils. These coils were still a common failure point in these engines. There was never an expected lifetime for these. People in humid states saw coils failing sooner, and people in dry states saw coils last a lot longer. The only thing we know for sure is that if the coils are around 7 years old, and one fails, it's best to replace all 8 coil packs at the same time rather than changing just one at a time. Getting the whole bundle of 8 coil packs is a lot cheaper because you save on shipping costs, and you won't have to re-diagnose the misfire more than once. Buying 8 coils at your local store is also not worth it as these can run $50 or more at the local auto parts stores and dealers. We have the full set of 8 coils at just a little more than the price of one ignition coil, and they are the same or better quality. How can we do this? This is our number one question. You see, the local parts stores may buy 8- 16 coils at a time where we purchase over 3,000 coils at a time, allowing us to get these oils at incredible wholesale prices, and pass the savings on to you. We not only want to help you save money on the parts. We want you to save money on the entire process. That is why we offer how to diagnostic advice for each year crown Victoria, right here.

 

How to Find a Misfire in Your 2009 Ford Crown Victoria

 

There are 2 misfires. The easy one to find, which is when your check engine light turns on, and the hard one to find, which is when there is no check engine light. We will start off with the hard one first. There is one tool you will need for this. An OBDII scanner with Mode 6. These start at $50 online, and they are worth every single penny. The PCM records and stores all misfires, and with these scanners, you are able to see everything the computer sees. To find these hidden misfires, turn the ignition to the ON position, but do not start your Crown Vic. All of the lights on the instrument cluster should be ON, and the engine should be OFF. Plug the Mode 6 OBDII scanner into the OBDII port (also called the Data Link Connector/DLC). Follow the instructions on the scanner. When everything is loaded up, go to the Non Continuous monitors (sometimes called Onboard Diagnostic Monitors). Select Test ID $81 (for 2007+ Fords). From here you will be able to see the cylinder numbers, and how many times exactly the misfire was detected. From here you can go to the specific cylinder and inspect the ignition coil, spark plug, fuel injector, and wire harness connection. We recommend to swap the ignition coil to another cylinder. Reset the computer with your scanner, or by unplugging the battery for one minute. Drive your 2009 Crown Victoria until the check engine light comes back on. Rescan the check engine light to see if the new code follows the ignition coil, or not. This way you will know for sure if you have a bad ignition coil. The coils are held in with 7mm bolts. You will need a socket, and extension, and a 5/8 spark plug socket if you plan on changing the spark plugs as well. If you do have a check engine light on, all of these steps are skipped. You can get a basic $10 scanner online, and scan for codes directly. If you get a code P0301 through P0308, then you have a misfire for sure. From here, you can go straight to the cylinder and follow the steps we listed above.