2006 Mercury Milan V6 With Melted Coil
Hey guys, first time posting so go easy on me lol.
this one came in, tech put new coils and plugs, never told us cyl 1 was melted(coil). So 15 minutes later ofcourse we had a mis and a new genuine burnt coil(again)...now im being asked to look at it. I scope it and find normal signal present but no actual spark ofcourse...I check the harness and confirm no short to ground on driver side of wiring. Then I had him reinstall a used working coil and I found the signal starts normal and rapidly declines. My question is when the ground side is hovering around 2,5 volts,does that still keep the coil some what energized hence buring it up? I dont want to run it too long to see if it stays at ground eventually. Also I did try a noid light and it does pulse( does not stay lit). I have ordered a pcm but just wanted some clarification. Thank you very much! FORGOT TO MENTION, YELLOW TRACE CYLINDER #1, RED IS #4, AND GREEN IS CURRENT AT FUSE LOOP (FUSE 43).
This is pretty common I have done a few PCM for this issue. The ones that I had messed with were always grounded constantly. So it sounds like this one is on its way to that. Chris
Needs PCM, it needs programmed (PMI) and DO NOT ERASE THE KEYS. It WILL need a parameter reset. More common than an ice cream cone melting in the sun in summer.
I have programmed dozens and dozens if not over a hundred of these computers for burning up the coils. Looking at the yellow trace 1st capture is only showing voltage of 5v when not commanded on, so I am thinking the voltage is being dropped across that coil all the time also look at the amperage current is flowing !, I am thinking through that coil. I would move my lead around or use other…
PCM is Failed - Replace and program.....
2.5V on the control side, and 11V on the feed side, equals 8.5V drop through the coil. The "somewhat energized" is obvious. However, what you wrote differs from what your scope captures show. The scope says that COP #1 control "off" voltage was about 4.5. Once the driver and/or the coil overheated (second capture), "off" voltage was about 3.5. Still, that is a huge amount of excess…
I remember some Nissan Maximas melting COPs because the main ground cable from battery negative to the transmission would break, from flexing. Some Dodge engines had melted coils because the cmp, ckp sync was wrong and then the PCM would ground some coils on for too long, melting some coil The green channel shows 3 COPs with high amps and 3 COPs with low amps.
This is a good capture from an 07 Ford Edge 3.5L CH B is a COP primary coil winding voltage and the PCM is grounding the winding for a total of 28.52 crank degrees. The initial dwell ground voltage drop measures 0 volt and the second spark time measures 1.43ms. CH C is all 6 COP amps at the fuse and each primary coil winding draws near 8.6A
Thank you so much to all of you. I have ordered the pcm and will receive it some time next week. I will update you all at that time with new screen shots!
There is a TSB on this issue and the coil kit is less than 1 or 2 coils bought elsewhere. TSB 14-0059
There is a you tube video on changing the drivers. I have done a couple. Easy fix. Super common
ok guys this one is down the road! reman pcm did it. was actually able to do the parameter reset using a Launch! It was unsuccessful first try but after a nother 10 minute wait it went right through incase anyone wants to try. I did have the fjds ready on standby ;). here are the final captures after engine was running for a bit.
Sounds …! Next time, set the peak voltage on the scope to the maximum setting.
I’m not sure that can be done in deep recording using the ats. I will check! Thanks