Multiple ignition coil faults after changing spark plugs

[Agent_Ice]

I just changed my spark plugs on my '07 Ford Expedition but now I'am having multiple misfire problems stemming from the coils. I've never had a code come up before although I was noticing misfires which led me to replace the spark plugs. A couple spark plugs and coils work without issue and the truck can run but with typical misfire issues. The spark plugs I changed were ungodly corroded and broken but I drove this truck for multiple years as it was. Are the spark plugs wrong or can the moisture from the anti seize cause this much misfire from the coils and I should should just clean them more thoroughly? Also I did not use any Dielectric grease.

 

[Trainmaster]

Did you change the coil boots when you changed the coils? Assuming you did, the use of dielectric grease often helps the boots slip onto the plugs and it's possible that when you installed the boots "dry" some did not seat properly. I'd remove the offending coils, replace the boots and inspect or replace the contact springs if you didn't already and reinstall them with a touch of dielectric grease to assure they are seated.

Inspect the coils well, looking for carbon tracks along the bottoms. Make sure they are seated well into their wells. It's possible to install a coil with the boot completely missing the plug.

Also check that the connectors are clicked in properly to the coils. Make sure the fuel injector plugs weren't loosened or messed with when you were changing stuff.

If all fails, move some coils around to see if the problem follows particular coils. If any are faulty, replace the bad ones with OEM coils. The $8 Chinese ones from Ebay or parts stores may just have you chasing more problems.

The tough work is behind you. You got the plugs changed. This should be easy here.

Welcome, Agent.

 

[JamaicaJoe]

If you didn't replace the boots and springs, I would do so immediately. Also any antiseize on the plug insulator or boots can cause problems.

 

[Agent_Ice]

I just changed my spark plugs on my '07 Ford Expedition but now I'am having multiple misfire problems stemming from the coils. I've never had a code come up before although I was noticing misfires which led me to replace the spark plugs. A couple spark plugs and coils work without issue and the truck can run but with typical misfire issues. The spark plugs I changed were ungodly corroded and broken but I drove this truck for multiple years as it was. Are the spark plugs wrong or can the moisture from the anti seize cause this much misfire from the coils and I should should just clean them more thoroughly? Also I did not use any Dielectric grease.

I got it fix. I took the coils back out and cleaned them, tested them and used some dielectric grease and didn't have any issues. Still got one spark plug to change but I stripped it a little so I can't replace it with a conventional socket anymore. I'm wondering if I should take it to a mechanic or figure something else out.

 

[jkayca]

Is it still misfiring on that cylinder? If not, I would be tempted to leave it alone until next time you change the plugs. Considering how old the truck is, this maybe the last time before something else goes catastrophically wrong.

 

[Agent_Ice]

Is it still misfiring on that cylinder? If not, I would be tempted to leave it alone until next time you change the plugs. Considering how old the truck is, this maybe the last time before something else goes catastrophically wrong.

Yeah I'm tempted to think the same but that not my way. It's gonna bother me until it's replaced. Have a V8 running on 7 cylinders makes me feel like I'm lying to myself.

 

[jkayca]

Yeah I'm tempted to think the same but that not my way. It's gonna bother me until it's replaced. Have a V8 running on 7 cylinders makes me feel like I'm lying to myself.

If the cylinder isn't working at all definitely replace.