its a bit long and my spelling sucks but i was hopping some of you could chime in. thanx in advance.

i have had my 04 4.0 ranger for a little over a month now. i was driving home on the highway at about 70 mph with cruse control on and my check engine light started flashing so i figured it was a misfire and posibly a plug or the coil whent. so i started to slow down my exit was comming up and the truck started bucking hard so i drove it to my cusions garadge about 1/2 mile from my exit off the highway. when i got there the truck was runing like compleat **** so we looked at all the ignition stuff everything was fine no blown plugs nothing. we got one of them surface thermomiter (sp) things and checked the cat to see if it was clogged, the rear cat showed 425 degreese and right before the cat it showed - - - (which is over 999 degrese) so we figured a cloged cat. took it to ford cause the cats are warenteeded till 80k. ford told me that the cats where fine and that cyl 5 had no compression and the motor was toast. i took it back to the dealer i got it from to see if they would cover it under warentee and it just so happens im 1200 miles over my warentee but because i got it such a short time ago they are willing to pay 1k tord the new motor. so i got the truck towed back to the ford dealer ship to get a new motor put in. my dad knows a guy at the dealership so were getting the motor put in for 5100 minus the 1k the dealer is giving my so it should be 4100 when were done. but whats strange is how it happend, and i still dont beleave i need a new motor, i wasent burning oil i never beat on the truck , there was no noises and the truck was running great up untill it happend. i was wondering if any of you guys have heard of this problem before and know an easy fix or if i realy do need a new motor. im pretty much getting the motor regardless but if its somthing some one on here knows of i can save the motor and one of you guys can take if off my hands to builed it up or take a look at it.

btw there were 61k miles on the truck.

 

was the oil level correct?
was it running hot?
plug a scan tool in it and see what codes it brings up.

 

yes
no
misfire codes

 

buy a compression tester and test it yourself. It's pretty easy to do.

 

well i dont have the truck its at the ford dealership, and both ford and the place i bought it from did a compression test :(.

 

If there is no compression in Cyl 5, sounds like you dropped a valve.

Bummer for you if it's true.

 

yeah i think i did but it was just enough to clear the piston otherwise i would of mashed up the valve train.. either way its got a new motor now so it runs good ****ty part is it cost the same to replace the motor then to do head work :(.. do you know if this is a common problem on these motors??

 

how much is the engine????

we are putting an enhanced ford long block 4.6L in my dads truck for about 3k that includes labor.

btw since it is a ford motor tell them to get you the motorcraft 200$ rebate form, if you cannot get it shoot me a PM and ill send you the link to it. its for the purchase of a new long block save 200$ now till December 15th...