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John Matthews
John Matthews Posted on Apr 15, 2019
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My 2008 Ford Fusion V6 #3 coil has power but is not getting signal from the computer. I tested with a coil and plug grounded to the chassis. All other cylinders sparked but the number 3 didn't

The vehicle will start but is missfireing. The diagnosis say that there are no missfires.I replaced all plugs and coils. The number 3 coil was burned badly with bulging and a large crack in the housing.

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Jeff Armer

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  • Ford Master 3,418 Answers
  • Posted on Apr 15, 2019
Jeff Armer
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You need a new PCM - engine computer . The transistor inside is fried . This is a problem on ford coil on plug ignition systems , the spark plug gap gets to wide causing the coil to work harder ,gets hot an shorts out frying the transistor inside the computer . Watch this video on testing computer drivers ( transistor)
https://www.youtube.com/watch?v=8FnYllf5D9E&t=13s

You can't just replace the PCM with a used either , needs to take a trip to the dealer to be programmed .

youtube.com

How to test computer transistor driver without scan tool

5 Related Answers

Anonymous

  • 1 Answer
  • Posted on Jan 26, 2009

SOURCE: Missfire

You may need a new wiring harness. They have to be ordered from Germany. This is my guess. (I am having a similar issue with my '94; rough idle, #4 cylinder not firing intermittantly, replaced plugs and 8 ignition coils; new harness is my mechanics guess)


cheers and buena suerte

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Anonymous

  • 167 Answers
  • Posted on Jul 08, 2009

SOURCE: Missfire on number 3 coil on 2001 S type Jaguar 3.0 V6 Sport

Check the igniter module.
I assume you have a ecu code telling you #3 coil is missfiring ?
If so also check the crankshaft angle sensor .
If it is not an error code do a compression test and check the injector.
Hope this helps
Regards
George

mike mountain

  • 1916 Answers
  • Posted on Jun 01, 2011

SOURCE: i have a 1994 ford

check your compression, you might have low compression in that cylinder-also check your fuel injector in that cylinder, it may be damaged (wiring/connection) or defective.

pal03246

Phil Lovisek

  • 726 Answers
  • Posted on Aug 20, 2011

SOURCE: I have a 2002 Nissan

i would definately replace the coil. pretty certain that will solve your problem. do not drive with misfire or that can cause fruther damage such as catalyst failing, which is prety expensive.

Anonymous

  • 1 Answer
  • Posted on Apr 14, 2012

SOURCE: Missfire

just replaced plugs and COPS on 01 f-150 check engine light went out for a day. now it hesitates to start, has terrible miss at idle but runs fine. the codes say running to lean? btw, during plug replacement i removed an after market ford CNG assembly. did that assembly require different 02 sensors to compensate for the flash point differance between compressd natural gas and good ole gasoline.

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None from the ignition switch . A fuse in the BJB - battery junction box, (under hood fuse box) . The PCM - engine computer triggers the coils by transistors inside . Your best bet, take it to a qualified repair shop. These vehicles have been known to fry these transistors if the spark plug gap gets worn to big.


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