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Search Auto Parts Search Continuous Misfire Cyl. #4 Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> Engine Troubleshooting Popalopkis Novice Jan 31, 2019, 4:23 PM Post #1 of 4 (1730 views)      Continuous Misfire Cyl. #4   Hey a coworker of mine has a 2004 Ford Freestar with a 4.2L V6 - His Buddy played a prank on him and unplugged the wire from Cylinder #4 to scare him, since it has been plugged back in the engine has had a misfire that is inconsistent, when spark tested it will spark a few times and then stop for a bit and so on. We replaced the #4 Wire and Plug - after swapping out the plug from #4 to #6 to see if the misfire was plug or wire - still was #4, To be safe we replaced both #4 and 6 spark plugs. After All that the Misfire is still present and still randomly occurring - the ignition coil was never touched until the wire replacement and Misfire monitor is not being triggered, when hooked up to the Snap on Scanner it doesn't register a single misfire while running. (During Live Data tracking) I am at a loss and he doesn't want to send it across to the master techs yet if its something we can possibly mend '97 Acura NSX 3.0L (120k) '00 Chevy Blazer 4x4 4.3L (217K) '00 Dodge Grand Caravan 3.3L (168k) '02 Chevy Corvette 5.7L (56k) '97 Mercedes E420 4.2L (172k) Hammer Time Ultimate Carjunky / Moderator Jan 31, 2019, 5:37 PM Post #2 of 4 (1721 views)      Re: Continuous Misfire Cyl. #4   His buddy needs a good slap up aside his head. Unplugging a spark plug without grounding the wire spikes the coil Each portion of the coil also fires 2 cylinders, not just one so he may have done some more damage. Handling and pulling an old plug wire will also break up the carbon core and ruin the wire so I would tell your buddy to have the truck repaired professionally and give his friend the bill. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. Popalopkis Novice Feb 1, 2019, 12:32 PM Post #3 of 4 (1689 views)      Re: Continuous Misfire Cyl. #4   We ended up having him buy a set of wires/plugs/ignition coil, Ford Master said that should probably fix it. Wanted to say thanks for the response, coil ended up being much less than expected '97 Acura NSX 3.0L (120k) '00 Chevy Blazer 4x4 4.3L (217K) '00 Dodge Grand Caravan 3.3L (168k) '02 Chevy Corvette 5.7L (56k) '97 Mercedes E420 4.2L (172k) Hammer Time Ultimate Carjunky / Moderator Feb 1, 2019, 1:14 PM Post #4 of 4 (1684 views)      Re: Continuous Misfire Cyl. #4   Glad it got worked out. Closing out this question now. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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