Increase in mpg w/ 4.7L TB

goser · **Joined:** Sat Aug 30, 2014 6:34 pm **Posts:** 12

huntb wrote:

Sorry, but the electrical engineer in me is having a very difficult time believing this. Is this something from the owners manual or service manual?

If anything the positive cable should be removed first so that remaining capacitance in the vehicle will discharge

Electrical theory is fine and all that, but the negative should always be removed first and attached last. Why is this standard procedure for almost all vehicles? Simple... most if not all vehicles these days use a negative ground system, so when you're removing the negative terminal and your wrench touches anything metal, nothing happens. On the other hand, if you remove the positive terminal first and your wrench touches anything metal (which there happens to be a lot of in an engine bay) you get your tool arc-welded to the frame, or (if you're lucky) tossed across the room and not into your face.

How has this mod held up for those who have tried it? I got a great deal on a K&N intake, so I'm wondering if this mod is worthwhile. I can understand the increase in fuel efficiency off the bat, since it would be getting more airflow than it thinks it is and would therefore be running lean, but did the savings disappear once the truck learned the new airflow? And once the truck has re-learned for the new TB, are there any advantages when running less that WOT?

Cheers!

Scar0 · **Posted:** Thu Oct 15, 2015 11:07 pm

I have a permanent wedding ring on my left ring finger because of a starter (+) post arc and a screwdriver. Got it trying to bypass the solenoid on an old rig I had a while back. A 3rd degree burn is no fun at all. Gold is a very good conductor of electricity and heat!

My mileage is still very good, and seems to keep getting better as time goes by.
I recently went on a trip that I have made several (50+) times and used a lot less fuel then in the past. I did not calculate the actual mileage, but on a 90 mile trip I used 1/8 tank less then I used to. With my lift, rack, and over-sized tires, that is saying a lot!

SickRunners · **Joined:** Wed Nov 21, 2012 12:46 pm **Posts:** 8

So if bigger is better, why not a fastman ported 4.7 tb... Too big?

Gageraid · **Posted:** Fri Oct 16, 2015 1:47 am

SickRunners wrote:

So if bigger is better, why not a fastman ported 4.7 tb... Too big?

Try it out! I'm just not willing to spend the money on that extra step.

Scar0 · **Posted:** Fri Oct 16, 2015 2:51 am

SickRunners wrote:

So if bigger is better, why not a fastman ported 4.7 tb... Too big?

Bigger then a stock 4.7 won't help. At this point the limiting factor becomes the intake opening on the intake manifold. Try to ream that out and you will loose the seal.

Wolfpack04 · **Posted:** Thu Feb 25, 2016 5:18 pm

I recently acquired a 4.7L throttle body. I was trying to put it on today when I had some issues getting the plugs to detach. So I called my mechanic who is working on my KK this Saturday (tune up and some other stuff). I asked if he could install it for me, so I didn't break anything. He said probably not if it's electronic b/c he doesn't have the software to flash it. I left it at that, basically thinking he didn't want to be liable for anything that went wrong.

My question is, do I need to get anything flashed after putting this thing on? Or would that defeat the purpose of using the 4.7L TB?

Also I'm having a heck of a time getting the plug out of the old one... it probably has not been separated since the car was assembled, lol Any tips?

PALiftedKK · **Posted:** Thu Feb 25, 2016 10:02 pm

Throttle body is a direct swap. No need to flash, though you do have the option to flash. Not needed for a 4.7l tb swap.

Scar0 · **Posted:** Fri Feb 26, 2016 4:31 am

Yep, Plug and play. Disconnect the Neg (-) battery cable then follow the instructions here in the thread.
2 options; mount it upside down, or do like I did and ream the holes out in the TB to match the nubs on the intake (Pics in the thread).
You will get some RPM hang time right after the install. So just beware that it will happen. After a few revs while parked it will settle in a little better, and after a couple trips it will be totally gone.

Wolfpack04 · **Posted:** Sun Feb 28, 2016 3:17 pm

Installed the TB today (2008 dodge ram)...used the Spectre 2.5 to 3 adapter.

She started right up but the traction control and throttle control dash lights came on immediately. I revved it to about 2200 but it didn't go any higher. I haven't taken it for a drive yet but I'm concerned it'll lose power and stall. Is this normal?

Edit: Just started it up again and took for a drive. ThE traction control light went away until i revved to 3500 then it came back on. Tried to drive it and it had no acceleration. Not sure what's going on so I put the 3.7 TB back on for time being.

Scar0 · **Posted:** Mon Feb 29, 2016 4:13 am

Which direction did you mount it? Did you disconnect the Neg battery cable when working on it?

Wolfpack04 · **Posted:** Mon Feb 29, 2016 6:54 am

Upside down (didn't want to grind the nubs down) and yes I disconnected the neg cable. I'm going to try again today.

Does it matter if both the pos and neg cables are detached?

PALiftedKK · **Posted:** Mon Feb 29, 2016 9:20 am

Make sure hoses and tubes are tight. Sounds like your introducing air into places it shouldn't be.

Wolfpack04 · **Posted:** Mon Feb 29, 2016 2:39 pm

Checked the hoses, and things went a little better. Throttle control light came on and off as the engine tried to settle in to idle RPMS, but stability light did not. The problem is likely the hose adapter (might need to figure out a more snug fit), or maybe a bad doner throttle body.

I let it run for a few minutes in park and at one point it idled perfectly at 500, then I revved it to 3500 and it couldn't get back into idle....kept bouncing up and down between 500 and 1000. I've got pics and videos so I'll try to post later.

Scar0 · **Posted:** Tue Mar 01, 2016 4:15 am

Check the small rubber gasket on the intake side of the TB.
I did not grind off the intake alignment pins. I enlarged the holes on the TB to fit the alignment pins on the intake.

PALiftedKK · **Posted:** Wed Mar 02, 2016 10:51 pm

Wolfpack04 wrote:

Checked the hoses, and things went a little better. Throttle control light came on and off as the engine tried to settle in to idle RPMS, but stability light did not. The problem is likely the hose adapter (might need to figure out a more snug fit), or maybe a bad doner throttle body.

I let it run for a few minutes in park and at one point it idled perfectly at 500, then I revved it to 3500 and it couldn't get back into idle....kept bouncing up and down between 500 and 1000. I've got pics and videos so I'll try to post later.

What your describing sounds like a failure of ecu reset. Make sure to unplug the battery for a minimum of an hour to reset the ecu. From there plug the battery in, start the engine up and let her warm up. DON'T step on the gas untill the engine drops down to 500 rpms. Once the rpms are that low then go ahead on going through the rpms slowley.

Problem fixed.

PALiftedKK · **Posted:** Wed Mar 02, 2016 10:54 pm

Remember, the physical connectors are plug and play, the electrical link between the throttle body and ecu are bound permanently unless a hard reset is performed. Swapping the 4.7l tb out with the 3.7l tb while still electrically bound is a gigantic No No.

WHITE the civilian · **Posted:** Thu Apr 28, 2016 2:40 am

I still can't find the right 4.7L body for an 06 KJ.

I have the fly by wire and not the electronic connection.

Anyone?!

John3:17 · **Posted:** Thu Apr 28, 2016 2:49 pm

WHITE the civilian wrote:

I still can't find the right 4.7L body for an 06 KJ.

I have the fly by wire and not the electronic connection.

Anyone?!

Send you 06 TB to this guy
http://stores.hi-potek.com/hipotek-65-5 ... 2003-2007/

And make an exchange and be done with it.

WHITE the civilian · **Posted:** Thu Apr 28, 2016 3:44 pm

John3:17 wrote:

WHITE the civilian wrote:

I still can't find the right 4.7L body for an 06 KJ.

I have the fly by wire and not the electronic connection.

Anyone?!

Send you 06 TB to this guy
http://stores.hi-potek.com/hipotek-65-5 ... 2003-2007/

And make an exchange and be done with it.

Seems too expensive, the fastman does it for $150 with core.
And I don't have to ship mine in first.

Are there no 4.7L throttle bodies for an 06 kj that I can use?

Scar0 · **Posted:** Sat Apr 30, 2016 7:49 pm

WHITE the civilian wrote:

Are there no 4.7L throttle bodies for an 06 kj that I can use?

Not having your TB or being familiar with it, that is a good question.
Maybe you can hit a junk yard and look at a few to see if you can find one that would work.

Increase in mpg w/ 4.7L TB

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