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1999 Ford F-150 Lightning Questions

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Engine keeps dropping compression on cylinder 4, even after adding to brand new engines sane problem continues, also oil gets into intake! When removed spark plug on cylinder 4 it comes out white with a little of oil on it also. Any suggestions? This the third new engine and doing the same problem. 4 mechanics can't figure it out, also no check engine light comes on and scanners can't read anything on truck
We can not get any of it to come loose let alone remove. Anyone have any suggestions?
Fan blade is cracked and needs replacing.
Truck will not start after new Alternator was installled.
Could this have effected the fuel pump cut off switch.
The starter motor turns hard but definitely no spark.
The truck did start fine with the new Alternator for the first week.
First the Alternator went out. I put a new battery in and even before I changed the alternator, the starter would spin but I could not start the car.
Now 2 weeks after a new alternator is in, I have the same problem again with starting (it feels like something may have turned the fuel pump off)
This truck has always started at first asking until now?
Thank you in advance for any assistance. Not fun being without transportation
First the Alternator went out. I put a new battery in and even before I changed the alternator, the starter would spin but I could not start the car.
Now 2 weeks after a new alternator is in, I have the same problem again with starting?
This truck has always started at first asking until now?
Help!
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