Ignition coil failure

Tiny
IAN55
  • MEMBER
  • 2006 FORD ESCAPE
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 80,000 MILES
With key on (not running):
Test light connected negative battery terminal to solid red wire on coil connector = light on.
Test light connected to positive battery terminal to orange/yellow wire on coil connector = test light on. Ran the same test on coil # 5 = no light on light green/yellow wire.
My PCM is a 3 connector type, I would appreciate some help with the proper wiring color/punch out diagram for isolating further this apparent short to ground.

Your assistance is greatly appreciated.
Sincerely, Ian
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Monday, September 2nd, 2019 AT 2:50 PM

36 Replies

Tiny
KEN L
  • ADMIN
Hello,

Here is a good guide on how to check the wiring with the engine wiring diagrams below so you can see how the system works and which injector wires to test:

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Please let us know what happens. Can you please shoot a quick video with your phone so we can see what's going on, that would be great. You can upload it here with your response.
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Tuesday, September 3rd, 2019 AT 6:47 PM
Tiny
IAN55
  • MEMBER
Ken, thank you very much for the quick response and schematics. Although (diagrams 4 and 5) show this a single PCM connector, I needed the (Red coil wire diagram)(thank you for that ). Interesting during my research using 2carPros I found a previous thread for a 2005 Escape diagram. Request providing the attached pinout on a 3 connector type PCM. (Fyi attached ).

I did resolve my issue on #6coil / #22 pos. PCM. I ran a new wire: (in sep. Loom spliced/soldered/heat shrink at both ends of connectors.) (I know not prof. Protocol) but we are back up and running.
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Wednesday, September 4th, 2019 AT 12:54 PM
Tiny
KEN L
  • ADMIN
Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help.
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Thursday, September 5th, 2019 AT 11:26 AM
Tiny
SHAWN.MCKINNEY1
  • MEMBER
  • 2005 FORD ESCAPE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 97,000 MILES
I brought my vehicle to autozone and they told me the problem, was that I had coil packs, A and C, that were bad. I replaced the coil packs, but the car still runs unsatisfactory. When I get to about 40 miles an hour, it will start shaking and I have to let off the gas in order for it to stop. However, if I am on the highway and going about 80MPH, it won't shake. What do you think it could be?

Thank You
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Thursday, September 5th, 2019 AT 11:28 AM (Merged)
Tiny
BLUELIGHTNIN6
  • EXPERT
Could be dirty fuel filter or clogged fuel injectors restricting proper fuel flow. is engine light on?

This guide can help

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Please run down this guide and report back.
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Thursday, September 5th, 2019 AT 11:28 AM (Merged)
Tiny
SHAWN.MCKINNEY1
  • MEMBER
Yes, the check engine light is on. I already paid the money to get the fuel injectors taken care of. I know the 2 cylinders are misfiring. Could it be an electrical issue? If so, any specifics that you could think of?
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Thursday, September 5th, 2019 AT 11:28 AM (Merged)
Tiny
BLUELIGHTNIN6
  • EXPERT
Since 2 are misfiring and the coil packs are good then it could either be the spark plugs, plug wires or yes even electrical wiring to the coil packs that are not hitting.
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Thursday, September 5th, 2019 AT 11:28 AM (Merged)
Tiny
IRISHKJR
  • MEMBER
  • FORD ESCAPE
I have a 2003 Ford Escape 3.0 V6 2WD with 86000 miles. The check engine light came on and the dealer ran a test and said it was a number 6 misfire. They told me it would cost me $600 and that wasnt icluding the diagnostic check that they already did. The guy told me I needed a new ignition coil. I took it back and started working on it myself. Since it was ready for a tune up, I replaced the first three spark plugs and in order to get to the next three I needed to take off the upper intake, which was interesting seeing I had never done it. But I actually fiigured it out. My actual question is, how do I determine the bad coil? Which one is #6?
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Thursday, September 5th, 2019 AT 11:28 AM (Merged)
Tiny
KIN CHAN
  • EXPERT
In ur case easy. Look up firing order on the website about ur car. Swap #6coil with any others. Buy a cheap obd2 code reader from any of these vendor on this site. Read ur code and see if the misfire move to another cylinder. Or else.U gonna need a scope to compare wave forms which is kinda professional approach
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Thursday, September 5th, 2019 AT 11:28 AM (Merged)
Tiny
2CARPRO JACK
  • EXPERT
As you look at the truck. Drivers side farthest back is #6. Fords go through coils. Wouldnt be too surprised if a new one fixes it. You can get an OEM, which I reccommend or save a few bucks and install an aftermarket. Either way you should be able to do it a little cheaper. Good job going after it, now you have a better understanding of your truck
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Thursday, September 5th, 2019 AT 11:28 AM (Merged)
Tiny
KKELSO555
  • MEMBER
  • 2004 FORD ESCAPE
  • 6 CYL
  • 124,000 MILES
Hello. I had my check engine light come on so I got it diagnosed and the code came up at Cylinder #6 misfiring. I want to know if I should replace just the one ignition coil misfiring and maybe the spark plugs or If I should go ahead and replace the back three coils because of the car already being disassembled to get to them. I really want to know if one coil goes bad, do they all soon after? I just had a front coil replaced three months ago. These are getting to be expensive repairs so I just want to make the right decision.
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Thursday, September 5th, 2019 AT 11:28 AM (Merged)
Tiny
SATURNTECH9
  • EXPERT
So we know the coil is for sure bad?You don't have spark on number 6 cylinder?You swapped the coil to a different cylindert o see if the misfire follows?If you only have one bad coil I. Would just change the one that's bad. That's whati would do if it was my car. Also inspect the plugs.
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Thursday, September 5th, 2019 AT 11:28 AM (Merged)
Tiny
KKELSO555
  • MEMBER
I don't how to tell if the coil is definitely bad. This is what the auto repair place said when they did the check engine light diagnosis. I dont know how much they evaluated the situation but I might have to ask them to change the coil around to be sure.
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Thursday, September 5th, 2019 AT 11:28 AM (Merged)
Tiny
SATURNTECH9
  • EXPERT
It hard to say what they tested or didn't test unless they told you. So is the misfire a constant one?Like the one cylinder isn't firing at all?
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Thursday, September 5th, 2019 AT 11:28 AM (Merged)
Tiny
SATURNTECH9
  • EXPERT
Also you are doing the replacing of the coils or the shop that diagnosedi t?
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Thursday, September 5th, 2019 AT 11:28 AM (Merged)
Tiny
KKELSO555
  • MEMBER
Yes the engine light is constantly on and sometimes will flash and the car jerks even when in park and very much when it accelerates. The code on the engine light diagnosis came up as PO316 and PO306.
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Thursday, September 5th, 2019 AT 11:28 AM (Merged)
Tiny
KKELSO555
  • MEMBER
I will have an auto repair place replace the coils as I am not very handy with cars haha
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Thursday, September 5th, 2019 AT 11:28 AM (Merged)
Tiny
SATURNTECH9
  • EXPERT
So is the car apart now to accesst the coils?
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Thursday, September 5th, 2019 AT 11:28 AM (Merged)
Tiny
KKELSO555
  • MEMBER
No it is not. I just wanted an opinion before I took in as to what I should do. The repair place said that basically half the engine has to be disassembled to get to the back coils where this one is misfiring. I just was curious if it could be a different problem other than the coils and if I really needed to replace them all as they recommended.
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Thursday, September 5th, 2019 AT 11:28 AM (Merged)
Tiny
SATURNTECH9
  • EXPERT
OK so if the shop that diagnosed the bad coil will stand behind the diagnosis then I would have the coil replaced. It's up to you if you want to replace all three while there in there. If the spark plugs haven't been done in a while now might be the time also.
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Thursday, September 5th, 2019 AT 11:28 AM (Merged)

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