Expedition & Navigator1997 - 2002 and 2003 - 2006 Ford Expedition and Lincoln Navigator
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Motorcraft plugs. Unless you are looking for higher performance. Again unless you are looking for higher performance I wouldnt change the packs unless there is something wrong with them, those get rather expensive. Do you have a 2 or 3 valve motor?
Thanks for the response. Coils are ready to be changed...so they have to go. And I have the 2 valve Romeo.
What makes you think the coils are ready to go bad? They either work or don't, no in between.
If you don't want to "break the bank", just change the plugs with good plugs as noted above.
No reason to spend a dime on CP's until necessary. Even though mines a 5.4, I've changed two individual units in 317,000 miles.
Bob and better half
As my brother reminds me regularly... "Life is not a spectator sport."
2007 F-250, PSD, SW, CC, LB, 2 WD, 85k, coolant filter, DashBoss, 1999 Expedition 5.4 319k plus, 32' CrossRoads CrossTerrain 5th wheel Toy Hauler, 24' Chaparral Villain lll 598 ci
Thanks for all the responses. I'm going to rethink changing the cops. I'm getting a missfire (haven't pulled a code yet, was planning to have the code checked at the store) and with 134K on the truck, I just figured it was time for new cops.
Code came up p0300. That code has a list as long as your arm on the root cause. So...before I start dropping a lot of coin on new COP..plugs etc., lets just start out with cleaning the MAF sensor. From there will be checking vacuum hoses, egr valve and so on. Hopefully it's something simple.
The missfire code (p174) said it was random cylinders, not one specific cylinder.
Anyway, I'll post a report later on whether or not the MAF cleaning helps.
I had a misfire on mine a couple years ago and my autozone code reader was pointing me towards a bank one lean issue. Turned out to be a cracked vacuum hose. I was convinced it was a bad COP so I bought one as a spare and it still sits in my tool box unopened.
__________________ Tim SCPO United States Coast Guard Retired
2011 F-150 XLT 4x4 Ecoboost
2010 Ford Focus
2004 Expedition XLT 4x2 FTE Guidelines
Hi Alloro...I was told that if there was a bad vacuum, PCV valve, etc that the PCM would lean out the engine, causing the misfires. This is why I first started with the vacuum lines before I jumped into either the COPS or plugs etc.
I've changed the PCV valve..the old one was pretty gunked up and the truck runs better, but it isn't running as it should.
One step at a time, I guess.
Thank you for your response, I do appreciate your time.
Edit: I did clean the MAF sensor..that too helped a bit.
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