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Piece_of_Ford

New PCM, coils, and plugs but it still won't start!

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Hi all,

 

I'm completely stumped and needing some help. I have a 2006 Ford Fusion SE with 96,000 miles. Last weekend it began running really rough, so I got it to an auto parts store and ran the codes. Cylinder 5 was misfiring. The ignition coil was cracked. I replaced the spark plug and ignition coil and tried starting the car. It started, but was still idling really rough. It ran for 10 seconds or so and then died. Then it would only crank, never fire. After reading up on this forum and others, I saw that it's common for the PCM to go bad when a coil goes bad. So I removed the PCM, and sent it to Circuit Board Medics. I also bought 6 new spark plugs and coils. When I got the PCM back, I changed out all 6 spark plugs and coils (yes, even the new one), reinstalled the PCM, and tried to start the car. But again, it only cranks and won't fire. I'm getting fuel and air to the engine, so I just need the spark. I really have no idea what else to check. At this point I'm wondering if the PCM repair was faulty. The company stresses that they program the PCM and so I don't have to when I receive it. It's also not the security system - when I turn the key to 'on' the security lights up for a few seconds and then turns off. Any other ideas? I'm completely stumped right now. Thanks for any and all help!

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How did you verify that you are getting fuel into the cylinders and that you are not getting a spark at the plug?

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Thanks for the reply. The fuel pump is running when I turn the key to on, and when I push in on the shrader valve on the fuel rail I get fuel. I guess I don't 100% know I'm not getting spark, but it's not firing at all so I'm pretty sure I'm not.

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Too early for a fuel pump failure but could be. Does the 2006 have a separate control module for the fuel pump? Worth checking associated fuses & relays. Also get a pressure gauge so you can see the fuel pressure level, and if it holds steady while cranking.

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Crank it and then immediately pull a plug to see if it shows any sign of wetting.

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Thanks for the suggestions. Unfortunately I had to leave town for work so I'm away from the vehicle right now.

 

Circuit Board Medics (who repaired the PCM) contacted me and suggested checking fuses #43 & #48. Apparently it's not uncommon for those to have blown. I had the car taken to a dealer since I'm out of town, and they found a blown fuse for an injector. I don't know if that matches #43 or #48. They replaced the fuse, and the car started right up but blew the fuse and died again. They are now chasing down a short in the wiring harnesses.

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Now I think we are on the right path. Could be rodents or other pests gobbling up wiring also.

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Just to round out this thread, the dealer was able to find and repair the short, and the car is up and running again. Thanks everyone for your suggestions!

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