Very Sluggish
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Joined: Dec 2008
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Very Sluggish
I just bought a 2004 Ford 150 STX 4.6 it has 305 70 17 tires, 4:10 gears, and a K & N Intake and no mufflers with true dual exhaust. IT idles great and funs smooth but seems to have no power to me. Punching it from a dead stop is very dissapionting. It hesitates for about 2 seconds then starts to take off and it doesnt do that very well either. Its hard to explain. It seems like it wants to go but its held back by something. I was wondering if maybe its a gearing issue, or something electrical... it takes for ever to even get to 60 mph. please help!!
Former Vendor
Joined: Sep 2000
Posts: 2,627
Likes: 76
From: South Carolina
Hi 04nightprawler
About 80% of the issue is the factory PCM calibration. Seriously, look into some sort of flash tuner. My personnal daily driver was a 4.6L for 2 years and in stock form it was very lacking. Email me if you have any questions.
Any flash tuner will help make it come alive.
Merry Xmas to you
Mike
ps Welcome to FTE too...
About 80% of the issue is the factory PCM calibration. Seriously, look into some sort of flash tuner. My personnal daily driver was a 4.6L for 2 years and in stock form it was very lacking. Email me if you have any questions.
Any flash tuner will help make it come alive.
Merry Xmas to you
Mike
ps Welcome to FTE too...
Posting Guru
Joined: Sep 2006
Posts: 1,263
Likes: 17
From: New Castle, PA
I would check your MAF sensor and clean it ASAP since it has a K&N on it, it could be gunked up and throwing off your AF ratio. But i know sort of what you mean, my 4.6 is like that as well but ive check over the truck extensively and have come to the conclusion that its the way the truck runs, and im looking into a tuner, just my thoughts!
MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,606
Likes: 151
From: SE Georgia
it's the small v-8 paired with a heavy heavy truck
sucks, but tuning can/will help. somewhat surprised you have issues though. you said she has 4.10 gears with 33" tires right?
another thing, these trucks have an adaptive PCM controller for the tranny. try unplugging the battery for 30 minutes. This will clear the learned stuff and start off fresh.
just be aware she will run slighly 'strange' for a few days until the PCM adapts again.
sucks, but tuning can/will help. somewhat surprised you have issues though. you said she has 4.10 gears with 33" tires right?
another thing, these trucks have an adaptive PCM controller for the tranny. try unplugging the battery for 30 minutes. This will clear the learned stuff and start off fresh.
just be aware she will run slighly 'strange' for a few days until the PCM adapts again.
