Spark Plug question for Navigator.

Messages
30
Location
Georgia, USA
Not an oil question. 100,000 mile service for the Navigator has first Spark Plug change. Truck is running great. Is there any downside to waiting longer, say 10,000k? Just very busy, and then vacation. Thanks
 
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4,998
Location
Milwaukee, WI
Are you going on a 10,000 or other long drive as part of this vacation? Because not having "time" to get the preventative maintenance stuff done before a long trip is pretty bad karma.
 

JDD

Messages
595
Location
Utah
I went over 110K on my Ford SUV and plugs came out lickety split and did not look overly worn out. If you have the 4.6, there have been plug issues, but they were more for shooting plugs out of the head. Just be sure to torque appropriately.
 
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397
Location
USA
 Originally Posted By: StevieC
Nope... \:\!
+1 But I hope your last name is not Griswold and about to start out on a 'Vacation' in the Family Truckster
 
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4,838
Location
Kansas
 Originally Posted By: tennisdoc40
Not an oil question. 100,000 mile service for the Navigator has first Spark Plug change. Truck is running great. Is there any downside to waiting longer, say 10,000k? Just very busy, and then vacation. Thanks
I'm going to slightly disagree with a few other posters here and say, that if it was my vehicle, I'd replace them. I just get a little leery of the plug seizing to the head. Also, the gaps can get a little larger and they start to wear exponentially. If it's gone this long, however, another 10K won't hurt.
 
Messages
610
Location
Afghanistan
If the truck has been mainly driven on highway at normal speeds, then the wear on the plugs will be very slight. You could try pulling just one, that is easy to get at, and check it, but I wouldn't even bother. They have installed a long life plug in there, and if truck fires up instantly when starting, if the idle is perfectly smooth, and if you have been driving moderately then it should easily be o.k. for another 10k. Other signs of healthy plugs are that your gas mileage is what it should be, and the engine runs powerfully under all conditions.
 
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FZ1

Messages
4,727
Location
Texas
Really,running is not the problem. Seizing is the problem. You will notice a slight running improvement with new plugs. Just make sure you replace them with the long life oem plugs so you can minimize the number of times you have to change them. Don't check them,just get some new plugs at AZ,some anti seize compound and torque the new plugs carefully.
 

tennisdoc40

Thread starter
Messages
30
Location
Georgia, USA
Thanks all. New to this and really enjoy the forums. I can handle some simple medical questions if needed. Had a cancellation today and left the truck at the Ford Dealer today to have the work done. Read about spark plugs shooting out due to poor threading, including the 5.4. At least if Ford has trouble with them, they will have to stand behind them. Another 5k change with their 5-20 blend. 100k and going strong.
 
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