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Author
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Topic: 4.6 and 5.4 durable??
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ccode67
Gearhead Posts: 3285
From: douglasville,ga,usa
Registered: Mar 2001
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posted 10-20-2006 09:44 AM
 
Okay, these motors have been out for a while, how many miles are they going before needing rebuilds or replacement?My dad bought a 98 F150 with 225,000 on it, it runs great, doesn't smoke or use oil. Just curious how many have these motors with high miles.
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Whitson
Gearhead Posts: 290
From: Western Canada
Registered: Dec 2005
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posted 10-20-2006 10:03 AM
Part of my job is to look after a fleet of 250 Ford trucks, 98 & up. No V6's, all 4.6's, 5.4's and V10's.The 4.6's are holding up the best. I'd say they are good for 300K if they hav been maintained. Maybe more?
Most of the 5.4's and all the V10's are using oil and were using oil before they hit 100K.
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bob6364
Gearhead Posts: 447
From: griswold,ct usa MCA#59447
Registered: Dec 2004
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posted 10-20-2006 08:26 PM
my 1999 5.4 has used a quart every 1500 miles since 30k miles it has 150k now. I had to replace alternator twice and put 3 sparkplugs back into the drivers side head after they popped completly out wrecking the coil pack in the process,luckily the plugs only took the threads with them and not a chunk of the head,coil packs aren't cheap tho.------------------
Bob
02 Saleen #408
92 Black Vert GT
69 R Code Mach 1
71 coupe 302 99 F-250 Super Duty
2002 Exploder :)
http://community.webshots.com/album/214154666mXNhcr
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Ryan Wilke
Gearhead Posts: 3237
From: Stanton, Michigan, zip 48888
Registered: Oct 2000
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posted 10-21-2006 09:44 AM
quote:
Originally posted by bob6364:
my 1999 5.4...has 150k now. I had to...put 3 sparkplugs back into the drivers side head after they popped completly out wrecking the coil pack in the process,luckily the plugs only took the threads with them and not a chunk of the head....
Bob,
Do you mean the plugs simply shot right outta the head while under power??!! DANG!  Ryan 
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bob6364
Gearhead Posts: 447
From: griswold,ct usa MCA#59447
Registered: Dec 2004
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posted 10-23-2006 08:13 AM
Basically YES!!,Driving home I would hear a pop and then compression sound,the spark plug still in the coil pack would be bouncing on top of the hole it used to be in,the fella that does some of my mechanic work when (i'm to busy) and used to be a Ford mechanic says this was a problem in 1999 5.4's and v10's the heads where brittle,ford played it down and tryed to blame it on aftermarket sparkplugs which some plugs have as much as 1/3 of a thread less then oem plugs and will cause this falure.
BTW I have Bosch Platinums so I guess it was my fault ...grumble![This message has been edited by bob6364 (edited 10-23-2006).]
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