Misfire unknown
Thread Starter
Junior Member
Joined: Feb 2018
Posts: 16
Likes: 0
Misfire unknown
Hey guys! I’m have some serious troubles on figuring out what else I should check into to stop my misfiring issue. I have replaced spark plugs, coil packs, and vct solenoid. I was told that would fix my issue, but it didn’t do a thing at all. When I accelerate I can hear and feel the miss, then when I’m on the interstate I have to turn off overdrive to keep it from making a miss.
Senior Member
Joined: Apr 2013
Posts: 165
Likes: 12
From: Wisconsin
Are you getting any engine codes? Are you using Motorcraft parts? Have you verified you have continuity on the wires from the ECU to the COPs? May sound odd, but have you checked for vacuum leaks? Have you changed the fuel filter? Have you tried a noid light at each COP connection?
Thread Starter
Junior Member
Joined: Feb 2018
Posts: 16
Likes: 0
5.4 3v 180.000 miles. I am throwing codes like crazy and sometimes my light even flashes like crazy. The codes I cleared and they haven’t came back but they read misfire on cylinder 1,3,5,7 and B1484. No I didn’t use motorcraft coil packs or sparkplugs. I did change fuel filter but I have not checked for any vacuum leaks. I’m not sure what COps means. But I have not checked any wires except the ones attached to the coil packs and injectors. Also what is a noid light.
Last edited by Slickblackf1; Feb 3, 2018 at 12:00 PM.
A flashing CEL is a classic mis-fire condition.. COP= Coil on plug..which are your coil packs..
our trucks are very picky about plugs and coils. Not sure what brand you installed.. what year motor ? Did the coils come with new boots and springs ? Chinese coil packs will cause problems sometimes.. what was it doing prior to you replacing plugs and COP’s ? A noid light test the firing voltage signal.
DTC B1484 is your brake pedal switch open circuit.. that’s why your brake and ABS light came on.. un-related to the mis-fire codes. Suggest you replace the plugs with motorcraft SP546 and re-install the OEM coil packs with new boots and springs and go from there. Clean the COP spring contact area prior to install.. use a dab of dielectric grease on the inside boot ends to seal out moisture.
our trucks are very picky about plugs and coils. Not sure what brand you installed.. what year motor ? Did the coils come with new boots and springs ? Chinese coil packs will cause problems sometimes.. what was it doing prior to you replacing plugs and COP’s ? A noid light test the firing voltage signal.
DTC B1484 is your brake pedal switch open circuit.. that’s why your brake and ABS light came on.. un-related to the mis-fire codes. Suggest you replace the plugs with motorcraft SP546 and re-install the OEM coil packs with new boots and springs and go from there. Clean the COP spring contact area prior to install.. use a dab of dielectric grease on the inside boot ends to seal out moisture.
Last edited by techrep; Feb 3, 2018 at 01:21 PM.
Thread Starter
Junior Member
Joined: Feb 2018
Posts: 16
Likes: 0
I installed e3 plugs and got to coils off of eBay. The motor is a 2004. It was misfiring the same as it is now prior to the new plugs and coils. When I put the new ones in I put dielectric grease on them. The only reason I think it could be something else is because nothing changed after I replaced them all.
05 5.4l 3v s.crew lariat
Joined: Oct 2009
Posts: 3,505
Likes: 672
From: fl
Use better parts
use sp 546 plugs or champion plugs. E3 plugs have caused a lot of problems .
Replace all the rubber boots, they cause misfires . Boots hold back 30,000 volts from jumping to the heads ,no matter what they look like replace them.
Use quality cops ,
OEM best .Clean all cop contacts .
Clean carbon out of cylinder plug snout area that carbon breaks plugs . Carb cleaner is the best .
Use dielectric grease sparingly as it is an insulator.
This engine will not tolerate much wrong in the ignition circuit. Its not an easy area to work on ,do it first class to last 60k.
Replace all the rubber boots, they cause misfires . Boots hold back 30,000 volts from jumping to the heads ,no matter what they look like replace them.
Use quality cops ,
OEM best .Clean all cop contacts .
Clean carbon out of cylinder plug snout area that carbon breaks plugs . Carb cleaner is the best .
Use dielectric grease sparingly as it is an insulator.
This engine will not tolerate much wrong in the ignition circuit. Its not an easy area to work on ,do it first class to last 60k.
Trending Topics
5 Year Member
Joined: Jul 2009
Posts: 25,669
Likes: 437
From: Central NY
Injectors can also cause misfires, as can a bad FPDM. As mentioned above, these engines are hyper sensitive about plugs. Not sure I agree on the coils needing to be OEM, but the plugs definitely need to be.
You wouldn't be the first person to have issues with the E-3 plugs in this motor.
You wouldn't be the first person to have issues with the E-3 plugs in this motor.
I installed e3 plugs and got to coils off of eBay. The motor is a 2004. It was misfiring the same as it is now prior to the new plugs and coils. When I put the new ones in I put dielectric grease on them. The only reason I think it could be something else is because nothing changed after I replaced them all.
Moderator
Joined: Mar 2015
Posts: 5,793
Likes: 695
From: Arlen, Texas
If you used cheap parts and slap it back together sloppily you wont get good results. Everyone on here has given sound advice so far. Use good motorcraft parts, clean everything very well, and reassemble very carefully.