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spectreman
Dodge Dakota
7/30/2001
13:20:01
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 Subject: rough idle
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Message:
not all the time ,but enough to take it in.has anyone else had this problem i have a 2001 4.7 4/4.
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Bruce P.
Dodge Dakota
7/30/2001
22:31:00
|  RE: rough idle
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Message:
Is the rough idle while the vehicle is moving or at a dead stop? Auto or manual tranny?
Several folks have reported this problem. Most say it goes away as the system "learns" how to idle under various conditions. (the PCM has memory that must be "trained" by being exposed to various conditions. There are "tricks" to speed up the learning process.)
Also keep in mind that the 4.7L V8 Hemi has VERY tight tolerances. You will find that the engine gets smoother and MPG improves for up to 8000 miles.
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mark crisler
Dodge Dakota
7/30/2001
23:30:44
|  RE: rough idle
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Message:
my 4.7 was a throttle body ground problem. watch out for the f'en dealer who will tell you that they are doing a performance tune up but in reality the s.o.b.'s are doing a computer detune like the factory recall done on all the 5.9 r/t's to prevent transmision failures,warranty claims---oh yeah horse power too!!!
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spectreman
Dodge Dakota
7/31/2001
06:25:01
| RE: rough idle
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Message:
it happens when stopped at a light. i have auto trans.
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DavidG
Dodge Dakota
7/31/2001
06:52:30
| RE: rough idle
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Message:
I took my Dak ('01 4.7 4x4) in for engine knocking issues. They tryed to update the PCM but it would not take. They then used a flash for the '00 model and it took. My truck was built in Sep 00. I have no idea what this flash accomplished since I still have the same problem. Has anyone else run into this problem?
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Bluethunder
Dodge Dakota
7/31/2001
09:29:28
| RE: rough idle
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Message:
I have the same trouble that specter has...rough idle at times and I actually almost stalled once...4000 miles on the 4.7 right now...I havent done anything yet because I hear its a normal thing with these trux so why deal with the a-holes in the service dept..
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mark crisler
Dodge Dakota
7/31/2001
12:04:46
| RE: rough idle
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definately at the the trottle body. they should have a service bulletin a the dealer by now. the problem gets worse with heat and can cause stalling.
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redbone
Dodge Dakota
7/31/2001
21:47:55
| RE: rough idle
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Message:
hey bruce p its not a 4.7 ltr hemi just a plain ole 4.7
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Chad B
Dodge Dakota
8/01/2001
17:40:45
| RE: rough idle
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Message:
Just my 2 cents, I also had the same prob. I have a 2000 QC 4.7 with 23,000 miles on it. Every morning, and I mean EVERY MORNING, when I would start my truck, it would rev to about 1000 rpm's then go down to about 300 rpm's and almost stall, then jump to about 1300rpm's and return to normal. Also had it stall on me one time at a stop light. I was getting pissed and was going to take it in. I have done some mods to my truck and desided to install Autolite 3923's. Guess what......after installing the 3923's and home made intake with K&N cone filter, I reset my computer and have NEVER had the problem again. I think it was the 3923's that did it. Once again, just my opinion but one of the above did the trick.
00 4.7 QC 4x2 3.55's Auto
Home Made 3" intake with K&N
3923's
Also, can't wait to see what this thing will do in the quarter with the mods, seems to really haul A$$ now. If I just floor it, it will lay rubber for a good 60 to 80 feet...AWESOME!!!
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DK1
Dodge Dakota
8/01/2001
18:07:11
| RE: rough idle
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Message:
Warning!!!!! Whatever you do don't get the flash for the rough idle. I got it and it slowed my truck down bad. The worst part is about half way home from the dealer it started to idle rough again.I've just learned to live with it. But then again, maybe I'll try the old 3923's.
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Bruce P.
Dodge Dakota
8/01/2001
23:04:57
| RE: rough idle
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Mr. redbone
Many folks that know engines have studied the 4.7L V8 heads and blessed it with the "Hemi" name.
Yes... technically the heads have a small "flat" but the basic idea of having the sparkplugs between the valves demonstrates the hemispherical design of the heads.
All mechanical designs have engineering compromises based on intended goals. In the case of the 4.7L V8 Hemi, these are well understood and actually provide improvements over a "RAW" hemispherical design.
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mark crisler
Dodge Dakota
8/02/2001
01:02:16
| RE: rough idle
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Message:
well i see a trend here boys!!! as i said before it is a voltage problem at the throttle body (usually a ground) and DO NOT let the dealer touch the computer...PERIOD! find a performance shop that knows what's up. do yourself a favor and pay for a second opinion. Sorry but i don't think autolite spark lugs are a miracle cure.
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Bruce P.
Dodge Dakota
8/02/2001
17:05:47
| RE: rough idle
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Message:
Given that the TB is a metal section that is bolted to plastic all around. Your "Voltage at the Throttlebody" idea is interesting
However, each of the sensors / servos at the TB have a reference connecton that eliminates the need for "grounding" the TB itself for purposes of proper operation. Heck... there is even a sensor screwed right into the intake plenum.
There is the possibility there can be a buildup of static electricity at the TB if it were not grounded. (flowing air can create a charge of electrons)
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Craig
Dodge Dakota
JOIN HERE
7/27/2005
22:37:54
| RE: rough idle
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Message:
Ihave the same problem with my 2003 dodge dakota with 25000 miles on it. I took it in to the dealer and they could not find anything wrong with it either. They said the 4.7 was just a rough idling machine. I dont know if they was filling me full of kaka or not.
Craig
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Kowalski
GenIII
7/28/2005
13:36:50
| RE: rough idle
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Message:
They are. Most rough idle problems can be traced to a dirty IAC (idle air control) on the back side of the throttle body. You need to remove TB to clean it, be careful not to twist the plunger. TB gasket is reusable on the 4.7. If that doesn't cure the problem, try turning the throttle blade stop to slightly raise the idle. Mine idles smoothly, yours can too.
Lead, follow, or get out of the way
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Craig
Dodge Dakota
JOIN HERE
7/28/2005
14:11:17
| RE: rough idle
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Mine has only 25k on it. Do you think the IAC could still be the problem?
Craig
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Kowalski
GenIII
7/28/2005
14:48:18
| RE: rough idle
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Possibly, but I haven't had to clean mine in 40,000. Mine idled fine with the stock 65mm ('00 only) TB; when I upgraded to a 68mm TB from a manual transmission truck it wouldn't hold an idle. I adjusted the stop since I figured that the TB was set for a transmission with less drag at idle than my auto, and its been fine since. A Chrysler tech told me idle is controled by the IAC, but when I pressed him he admitted there is a base setting that is set at the factory and they advise not to touch it. My guess is that they are not allowed to touch it for emissions reasons, and also if you change it they will not know where that base is when they try to diagnose a problem. If your getting nowhere with the dealer, I'd try to adjust the idle up slightly to see if it smoothes out - I'd bet it will. Count the turns so you can return to factory setting if you need to, and don't admit to them that you ever touched it. You can get the special security head torx tool to turn it at a parts store; or just grab the threads on the backside with a pair of needlenose like I did to adjust.
Lead, follow, or get out of the way
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Craig
Dodge Dakota
JOIN HERE
7/28/2005
16:53:36
| RE: rough idle
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The idle is a little low I figure at about 5 to 600 rpm and when I asked the dealer about it he said it could not be adjusted as the rpm was controlled by the computer. I guess he didnt know what he was talking about.
I am not sure where this adjustment is you are talking about tho. I will have to take a better look.
thanks,
Craig
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Kowalski
GenIII
7/28/2005
19:08:49
| RE: rough idle
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Glad to help. You'll see it once you remove the air filter ducting from the TB, just need a screwdriver and a 10 mm wrench to remove that stuff. Probably solve your problem, mine idles closer to 700, still goes into gear smoothly.
Lead, follow, or get out of the way
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Craig
Dodge Dakota
JOIN HERE
7/28/2005
19:52:31
| RE: rough idle
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Message:
I did as you said and I seen the bolt and grabbed it with a small vise grip and backed it out 1 whole turn and we will see what happens after driving it. In the garage it may have upped it about 75 rpm.
Thanks,
Craig
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