edgeowner509 Posted January 1, 2019 Report Share Posted January 1, 2019 (edited) My 2007 Edge has recently run into the dreaded melted coil/fried PCM issue. I replaced all coils and plugs and sent the PCM in to be fixed by circuit board medics.com. I guess what I am looking for is whether or not there is an updated PCM to correct the issue of failure when a coil fails, or if you just have to stay on top of your plugs and coils once the issue is remedied? Also, After replacing the coils and plugs I ran the car for a few minutes to check if PCM was bad for sure (it still misfired, so I turned it off after a few minutes). What is the likely hood the coils got messed up again? I have read an open driver current on the PCM circuit CAN melt them again, but all of them are perfect looking still. Edited January 3, 2019 by edgeowner509 Quote Link to comment Share on other sites More sharing options...
fishx65 Posted January 1, 2019 Report Share Posted January 1, 2019 I drove my 2008 3.5 Taurus (75,000 miles) with bad coils for over a year. Finally got around to doing the three back coils and all the plugs and she's been running perfect for about 4 months. I'm guessing it would take quite while to damage coils with a bad PCM if it even works that way. I've always heard that bad coils can eventually damage a PCM but not the other way around. 1 Quote Link to comment Share on other sites More sharing options...
edgeowner509 Posted January 1, 2019 Author Report Share Posted January 1, 2019 Ok, thanks for the info fish! In my mind, a fully failed coil is more likely to damage a PCM than a bad PCM damage a good coil. When you send the PCM in for repair CircuitBoardMedics has a repair form that asks if you replaced coils. If you have, it asks if you ran the car with a possibly fried PCM and the new coils on it, explaining it can damage new coils and they won't warranty the fix. I cannot find any surefire way to test a coil, as resistance doesn't seem to be a good determination. My fully melted coil tested fine resistance wise, but its far from fine. Quote Link to comment Share on other sites More sharing options...
edgeowner509 Posted January 1, 2019 Author Report Share Posted January 1, 2019 4 hours ago, fishx65 said: I drove my 2008 3.5 Taurus (75,000 miles) with bad coils for over a year. Finally got around to doing the three back coils and all the plugs and she's been running perfect for about 4 months. I'm guessing it would take quite while to damage coils with a bad PCM if it even works that way. I've always heard that bad coils can eventually damage a PCM but not the other way around. Did your PCM have any issues from driving with bad coils? This issue definitely messes up the PCM in the Edge. Quote Link to comment Share on other sites More sharing options...
fishx65 Posted January 2, 2019 Report Share Posted January 2, 2019 23 minutes ago, edgeowner509 said: Did your PCM have any issues from driving with bad coils? This issue definitely messes up the PCM in the Edge. I haven't had any PCM issues in the Taurus yet. Not sure about the PCM but I believe the 08-09 Taurus uses the same COPs as the Edge. 1 Quote Link to comment Share on other sites More sharing options...
edgeowner509 Posted January 2, 2019 Author Report Share Posted January 2, 2019 Likely a different PCM. Those coils are on lots of models, but not all have the fried PCM issues. Quote Link to comment Share on other sites More sharing options...
Ntrain2k Posted January 3, 2019 Report Share Posted January 3, 2019 Might be better to move this to the engine section? Quote Link to comment Share on other sites More sharing options...
edgeowner509 Posted January 3, 2019 Author Report Share Posted January 3, 2019 7 hours ago, Ntrain2k said: Might be better to move this to the engine section? Can someone? I do not know if I can or how to do it. Or should I just repost? Quote Link to comment Share on other sites More sharing options...
Ntrain2k Posted January 3, 2019 Report Share Posted January 3, 2019 A mod moved it already. Quote Link to comment Share on other sites More sharing options...
PaulSchott Posted April 8, 2019 Report Share Posted April 8, 2019 My 2007 Edge has had an occasional misfire under these conditions. Low rpm in high gear while going slight incline uphill. The plugs were changed less than 40,000 miles ago and I wasn't looking forward to removing the intake again. I decided to look at the front 3 first. The second coil I removed I found that the coil boot had a burn , and carbon trace on the inside. Also found carbon trace on the plug and inside the well. The coil was perfect. I cleaned the well and the plug, and replaced the coil because the parts place didn't have the boot. While servicing I cleaned the throttle body. It's never been done. 138,000 miles and it was really dirty. The car is back to it's former pleasure to drive state. The computer wasn't hurt by this misfire. I am buying a set of boots and will change all at the next tune-up. 1 Quote Link to comment Share on other sites More sharing options...
Randi Gross Posted December 4 Report Share Posted December 4 When the coils are damaged (toasted or melted) it is probably due to a computer malfunction. Don’t expect to just replace the coils as if you don’t replace the computer it can / will most likely fry the new coils again. The way Ford makes this vehicle really requires that you have them change the coils due to having to take off the manifold/intake just to get to the those coils , then they can recheck the computer first to make sure it’s still operable before you blow our the new coils. Cost for that including a diagnostic check {$175 currently as of 12-3-24) and another $1400.00 for replacing the computer and $125 per coils x 6 or about $2450 for repairing a simple tune up. What an outrageous charge ! Sonora Ford didn’t want to read Rocky’s auto shop here in Twain Harte, CA or listen to what I explained the prior diagnostics (by Dan owner of Rocky’s) explained to me that I explained to them, so Sonora Ford changed all coils without testing the computer functionality, which ended frying one coil so far out of 6, which Ford called us afterwards saying that they would now have to replace the computer { an extra $1400 charge plus labor. - that they were not aware of ?…and they’re the experts. So much for diagnostics, which they apparently hadn’t read prior to doing their own diagnostic. Car has 135K mileage ..apparently these computers can be repaired which is less expensive ( and probably a lengthy process …so buy new). But I’ve found throughout my life that Men in general pay no attention to what a WOMAN says, so they blew me off completely by disregarding the computer issue. Oh well what’s a woman to do.. I really do like the Ford Edge and with new car prices being so outrageously expensive for a new one I have no choice.. but would hope that they’d at least not charge me for their diagnostic report that should have indicated a computer malfunction up front. Randi Gross Quote Link to comment Share on other sites More sharing options...
dabangsta Posted December 4 Report Share Posted December 4 (edited) missed quoting specific post replying to, but I can't delete this. Edited December 4 by dabangsta Quote Link to comment Share on other sites More sharing options...
dabangsta Posted December 4 Report Share Posted December 4 (edited) 46 minutes ago, Randi Gross said: When the coils are damaged (toasted or melted) it is probably due to a computer malfunction. Don’t expect to just replace the coils as if you don’t replace the computer it can / will most likely fry the new coils again. The way Ford makes this vehicle really requires that you have them change the coils due to having to take off the manifold/intake just to get to the those coils , then they can recheck the computer first to make sure it’s still operable before you blow our the new coils. Cost for that including a diagnostic check {$175 currently as of 12-3-24) and another $1400.00 for replacing the computer and $125 per coils x 6 or about $2450 for repairing a simple tune up. What an outrageous charge ! Sonora Ford didn’t want to read Rocky’s auto shop here in Twain Harte, CA or listen to what I explained the prior diagnostics (by Dan owner of Rocky’s) explained to me that I explained to them, so Sonora Ford changed all coils without testing the computer functionality, which ended frying one coil so far out of 6, which Ford called us afterwards saying that they would now have to replace the computer { an extra $1400 charge plus labor. - that they were not aware of ?…and they’re the experts. So much for diagnostics, which they apparently hadn’t read prior to doing their own diagnostic. Car has 135K mileage ..apparently these computers can be repaired which is less expensive ( and probably a lengthy process …so buy new). But I’ve found throughout my life that Men in general pay no attention to what a WOMAN says, so they blew me off completely by disregarding the computer issue. Oh well what’s a woman to do.. I really do like the Ford Edge and with new car prices being so outrageously expensive for a new one I have no choice.. but would hope that they’d at least not charge me for their diagnostic report that should have indicated a computer malfunction up front. Randi Gross It isn't the PCM taking out the coils, it is the plugs and/or coils that destroy the drivers on the PCM. If the plugs are worn out, if a coil fails in certain ways, it destroys the driver circuit on the board. There are companies such as circuitboardmedics that take in your PCM and fix them for $300 + 425 for 6 coils and spark plugs (which extends the warranty period on the PCM). Not cheap, but not $2450. Edited December 4 by dabangsta 1 Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted Friday at 05:26 AM Report Share Posted Friday at 05:26 AM As @dabangsta stated. It's the plugs that get worn, the gap widens, and the plugs draw more current (to fire across the larger gap.) More current, more heat. More heat, eventual coil failure. If they fail by shorting, they take out the PCM. If they fail by opening, just the coil needs changing. When replacing the plugs at 90k (max) also change the coil boots. The boots are rubber material and will harden with age and allow the plug to short out. (Which causes misfires.) Quote Link to comment Share on other sites More sharing options...
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