Ford Expedition Improving Gas Mileage

43 messages, Last post on Jul 23, 2009 at 6:00 PM

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What is this discussion about? Ford Expedition, SUV

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#42 of 43 Re: Quest for better MPG [harborharley] by buffalojoe Jul 23, 2009 (9:35 am)
Replying to: harborharley (Jul 14, 2009 5:52 am) I finished the plugs over the weekend and it took me a total of 7 hours (2 hours one night after work and 5 more in a straight shot on Saturday). I don't have the angled socket extenders so I was splayed out over the engine with the ones nearest the firewall. What a pain. The interesting part is three of them had corrosion on the higher part of the threads and the nut. I'd never seen that before on any of my vehicles. I have the 5.4L with coils but none of the rubber looked damaged enough to leak. I don't see any white smoke so the head gasket must be okay. It's a bit weird, though. The plugs looked as if they were wearing normally. There wasn't any fouling or anything that appeared out of the ordinary. We'll see if this helps the mpg. Replies to this message: harborharley (Jul 23, 2009 6:00 pm)
#43 of 43 Re: Quest for better MPG [buffalojoe] by harborharley Jul 23, 2009 (6:00 pm)
Replying to: buffalojoe (Jul 23, 2009 9:35 am) Ok on doing it yourself. I may have taken 5 hours total, I forget now. How was the plug on the passenger side rear? There have been some problems with the threads on the head on some 4.6 engines. This plug has actually blown out of the head in some cases. I did squirt some WD40 in the plug holes before I tried to remove them. I think I let it sit over night and soak in. Anyway good deal, you saved some money doing it. As I mentioned with 90K miles on mine the plug gaps were way out of spec, much opened. I have a 99 Expedition and it's almost show room condition! I get around 17 to 18 mpg on the hiway conservative driving.

#42 of 43: Re: Quest for better MPG [harborharley] by buffalojoe; Jul 23, 2009 (9:35 am)

Replying to: harborharley (Jul 14, 2009 5:52 am)

I finished the plugs over the weekend and it took me a total of 7 hours (2 hours one night after work and 5 more in a straight shot on Saturday). I don't have the angled socket extenders so I was splayed out over the engine with the ones nearest the firewall. What a pain. The interesting part is three of them had corrosion on the higher part of the threads and the nut. I'd never seen that before on any of my vehicles. I have the 5.4L with coils but none of the rubber looked damaged enough to leak. I don't see any white smoke so the head gasket must be okay. It's a bit weird, though.

The plugs looked as if they were wearing normally. There wasn't any fouling or anything that appeared out of the ordinary. We'll see if this helps the mpg.

harborharley (Jul 23, 2009 6:00 pm)

#43 of 43: Re: Quest for better MPG [buffalojoe] by harborharley; Jul 23, 2009 (6:00 pm)

Replying to: buffalojoe (Jul 23, 2009 9:35 am)

Ok on doing it yourself. I may have taken 5 hours total, I forget now. How was the plug on the passenger side rear? There have been some problems with the threads on the head on some 4.6 engines. This plug has actually blown out of the head in some cases. I did squirt some WD40 in the plug holes before I tried to remove them. I think I let it sit over night and soak in. Anyway good deal, you saved some money doing it.

As I mentioned with 90K miles on mine the plug gaps were way out of spec, much opened. I have a 99 Expedition and it's almost show room condition! I get around 17 to 18 mpg on the hiway conservative driving.