So October of 2011 I had to get my engine changed out since my Oil pump crapped out on me. Anyways long story short I had the Motor replaced with a rebuilt 5.4 and I didn't have much time to fool around check it out much since when I got it back from the shop a few days later left for over sea's Still here too. Anyways my question is on the drive back from the shop I noticed I lacked power like vary sluggish and slow I mean I push the pedel down and it takes time more time then with my last motor to gain speed. Anyways I was wondering when I get back do I have to get it tuned or give it time for the truck and computer system to get used to the newish motor? I am slowly become more knowledgeable with my truck since I want to keep it for as long as possible. But any Info would be much appreciated thanks.

 

I would trailer it back to the place that did the install.

something would be "very much" off...if it felt like loosing power or sluggish, especially after a rebuild.

& after such a long time from when it happened...nearly a year. You will have to really point out that the mileage hasn't changed & that you were serving aboard. On the bright side most quality rebuilds have 3yr warranty

Now it might be that it is something minor....a sensor or something that wasn't plugged back in or reconnected properly...or it can be serious

do you remember if it was tripping any codes? or check engine light was on?

 

It wasnt tripping any codes that I can remember the check engine light didnt come on or anything and it is reading miles. It just feels slower then before I had the replacement done.

 

well, not seeing the CEL is a good thing. but codes may still be present. Then again the shop may have inadvertently tripped one er two on the initial start up ...who knows?

Still think it would be a good Idea to get it back to the place that did the work and have them go back thru things and make sure everything is up to snuff. Seeing as you have been gone for some time serving our country...any reasonable place should understand that and take care of your situation.

check timing, fuel pressure, oil pressure & temperature of coolant, oil and exhaust. maybe even do compression check.

most times engines need a break in period...but I don't think that would include felling slower, maybe some minor oil consumption & slowly improving MPGs.

what were you driving while your truck was being worked on a motorcycle? sports car? or relying on friends/other means of transit?

 

I was driving my GF's Hyundai Sonata!

 

well, what I was getting at, is the physical change from a zippy mode of transportation like a motorcycle or sports car, to heavier & taller one, like a truck, can give the sensation of being lethargic or slow. Not sure I would say that the Sonata is "zippy" kinda car, then again I'm not familiar with them either.

Not saying that this is what happened just helping you to be aware.

the time element is is bigger factor, presumably, that it has been some time since you have driven your truck. If I understand this scenario correctly.