Bark Posted August 10, 2012 Report Share Posted August 10, 2012 I am having a sporadic misfire issue that I am trying to track down. It is not throwing a CEL so I can't pull a stored code. I am wondering if there is a scan tool out there that can datalog or real-time scan to help me identify this misfire. It is a Ford Duratec V6 with coil-on-plug ignition and typically acts up when its wet out. Im guessing cracked coil but at $70 a piece it could get expensive tracking it down. Anyone know where I could rent/borrow a tool to figure this one out? Quote Link to comment Share on other sites More sharing options...
SinisterSS Posted August 10, 2012 Report Share Posted August 10, 2012 (edited) just disconnect the coil one at a time while the car is running to see which cylinder doesn't change the misfire Edited August 10, 2012 by SinisterSS Quote Link to comment Share on other sites More sharing options...
twistedfocus1647545489 Posted August 10, 2012 Report Share Posted August 10, 2012 just disconnect the each coil one at a time while the car is running to see which cylinder doesn't change the misfire This, but if that gets you nowhere it could be as simple as packing the connectors with dialectric grease to keep water out. Not as likely as failed parts, but it happens. Quote Link to comment Share on other sites More sharing options...
Buckeye1647545503 Posted August 10, 2012 Report Share Posted August 10, 2012 I don't recall for sure but I think those had replaceable extensions from the coil to the plug. Also inspect all vacuum hoses for air leaks it will cause random issues. as for a scanner some will but they are mostly the real costly ones that a shop will have and you will have to pay a hr shop time for them to scan it. If it were mine I would start by making sure all maintenance items are 100% first (coil on plug boots, plugs, vac hoses,and air and fuel filter) Quote Link to comment Share on other sites More sharing options...
DOZZER Posted August 22, 2012 Report Share Posted August 22, 2012 If you haven't figured it out yet I have a tool to diagnose your problem. Quote Link to comment Share on other sites More sharing options...
Rocky31186 Posted August 22, 2012 Report Share Posted August 22, 2012 (edited) just disconnect the coil one at a time while the car is running to see which cylinder doesn't change the misfire If its sporadic, meaning not happening all the time. How is disconnecting one coil at a time going to diagnose his issue? Do you have any more info on car? I'm guessing you have pulled and checked gap on plugs? Edited August 22, 2012 by Rocky31186 Quote Link to comment Share on other sites More sharing options...
STEVE-O Posted August 22, 2012 Report Share Posted August 22, 2012 Sometimes when he drives it it doesn't have a issue. Other times it will start to miss. This happens with the same or different gas. Like stated its not bad or often enough to store a code to check. A scan tool that can monitor each cyl firing is all that's needed I'm guessing because it does not seem bad enough to be multiple cylinders. Quote Link to comment Share on other sites More sharing options...
gbracing81 Posted August 22, 2012 Report Share Posted August 22, 2012 Even though the SES light is not on, it may have a stored code for cylinder misfire. Wouldn't hurt to go to your local parts store and have them scan for codes. Especially since it free there. Quote Link to comment Share on other sites More sharing options...
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