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Patriot QC
Dodge Dakota
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8/01/2004
22:14:46
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 Subject: 4.7l bog
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Anyone had a problem with their 4.7l bogging at around 3000RPM under WOT? The bog is temporary and the truck recovers and keeps pulling all the way to redline, although it feels like its not making full power. This has been going on for 3-4 months now. I suspected the O2 sensor, so I swapped the sensor after the cat with the one before the cat, but this did not totally fix the problem. Seemed a little better, but still not right. The truck has a miss at idle. Not a bad miss, but you can definitely hear it out of the exhaust pipe and in the cab. Kind of an occasional pfft sound from the tail pipe! I guess I'll take it to the dealer since its under warranty. I have changed the plugs twice to no avail. I have also ran 3 bottles of STP fuel system cleaner through it. Out of ideas!
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jasonsdakota
Dodge Dakota
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8/01/2004
22:36:49
|  RE: 4.7l bog
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well no wires so not bad wires. do coil packs go bad, we've got eight of them.
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GraphiteDak
GenIII
8/02/2004
00:09:00
| RE: 4.7l bog
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WOW. If you can hear it miss at an idle, something is wrong. Maybe a plugged injector?
I've had luck removing and cleaning injectors twice now, but on Chevy's.
The 4.7, when running properly, has NO flat spot. That's what is so cool about it. It jumps out of the hole and pulls to 6K... stock.
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Patriot QC
Dodge Dakota
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8/02/2004
10:11:30
| RE: 4.7l bog
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Would an EGR problem cause something like this? I've noticed the bog when running at part throttle as well as WOT.
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Figols
Dodge Dakota
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8/03/2004
10:58:09
| RE: 4.7l bog
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Sounds like the beginnings of a TPS sensor failure.
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Patriot QC
Dodge Dakota
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8/03/2004
11:18:10
| RE: 4.7l bog
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Figols, I just received info on how to test the TPS sensor while the wire harness is attached. I will be checking it out in the next day or two. I'll keep ya posted.
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Mike Browning
Dodge Dakota
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8/03/2004
12:46:39
| RE: 4.7l bog
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Hey Patriot,
Is the TPS sensor held on with torque screws?
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Patriot QC
Dodge Dakota
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8/03/2004
13:41:43
| RE: 4.7l bog
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Yes, the TPS is held on with torx screws.
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MikeBrowning
Dodge Dakota
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8/03/2004
14:01:20
| RE: 4.7l bog
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Hey Patriot,
Thanks for the info. Wanted to make sure sure I was looking at the right thing.
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daffydak
GenIII
8/03/2004
14:35:47
| RE: 4.7l bog
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yes the TPS is held on by torx T-25 screws. if you have a digital multi meter you can check the tps (somewhat) backprobe the center wire on the TPS (with harness connected key on engine off) and the neg. to a good ground (I find that the neg. terminal on the batt gives the steadiest reading) .76 is the optomal setting at fully closed throttle (mine was at .5 something from the factory). WOT should be around 4.0V or so.... slowly open and close the throttle, the voltage should smoothly rise/fall with throttle movement.
I would take it to the dealer, and pitch a fit about it (i still have almost 2 yrs on my warranty LOL) heck thats what it's for! Allthough sometimes I'm just a do-it-yoursely guy :P
Dan
MOPAR=More Power!!
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Mike Browning
Dodge Dakota
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8/03/2004
14:53:18
| RE: 4.7l bog
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Hey daffy,
I read my TPS this morning, was reading .602. I am wondering if I should raise it up some.
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Patriot QC
Dodge Dakota
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8/03/2004
16:28:20
| RE: 4.7l bog
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daffydak, that is what I am doing as well. Occasionally, I like a good challenge. I'm not going to delve into anything expensive, I'll leave that up to the Techs. But I was hoping to enjoy the satisfaction of a successful troubleshoot. Basically, I don't want to be without my truck (my baby) while it's being troubleshot. Usually, it's the simplest (read cheapest) things that give you the problems. Looks like I won't be so lucky this time. At least I've ruled out the basics. Now, when I do take it in to the dealer, they won't have to waste time and effort (both mine and theirs) on these things and the real issue will be diagnosed more quickly.
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daffydak
GenIII
8/03/2004
16:59:43
| RE: 4.7l bog
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Message:
yeah I hear ya Patriot QC troubleshooting is fun (so long as its nothing major :) you might have a faulty injector or PCM issues. the dealer should be able to hook you up with a fix. Keep Truckin'
Mike; if your TPS is already at .60v, you might not notice much of a difference with the mod. you should still notice a slight diff though (especially TQ converter lockup) and downshifting sensitivity. what was the voltage at WOT?
Dan
MOPAR=More Power!!
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midnightmagic
GenIII
8/03/2004
17:22:36
| RE: 4.7l bog
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Message:
hey graphite did the ho cams give you a big boost in power? im in iraq right now and im scheduled for return this sept, i was looking into the ho cams and 70 mm tb? any recomendatins
You gotta ask yourself one question...That Thing Got A HEMI???
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Mike Browning
Dodge Dakota
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8/03/2004
22:22:41
| RE: 4.7l bog
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Message:
Hey Daffy,
do I measure WOT with the engine off like I do for the intial voltage.
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daffydak
GenIII
8/03/2004
22:50:41
|  RE: 4.7l bog
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Message:
yep you sure do 8-)
Dan
MOPAR=More Power!!
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GraphiteDak
GenIII
8/04/2004
00:18:27
| RE: 4.7l bog
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midnightmagic, I think they (HO CAMS) did more once I opened up my throttle body. Alone I really couldn't notice just from before and after. In combination with the ported 68MM TB the BIG difference is above 4K and especially when it shifts. I'll need to make a video this weekend of it shifting I think.
My next step would probably be some GOOD headers to gain some low end. Then some gears... Just need to catch up with $$$$$ first.
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Mike Browning
Dodge Dakota
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8/04/2004
10:15:32
| RE: 4.7l bog
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Message:
Hey Graphite,
On removing the clutch fan, how hard is it and do you ever overheat.
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Andy
Dodge Dakota
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11/03/2010
18:41:20
| RE: 4.7l bog
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Message:
I have a 06 Dakota 4.7 v8 that has a slight miss. Scanned the code and it shows cylinder 7 missfire. swapt the coil from cyl 1 and still cyl 7 missfire. checked for pulse and replaced injector still same missfire. I have checked compression and it has 120 lbs. Took off fuel rail and the injectors are spraying fine. No clue what this could be.....PLEASE HELP
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