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OJ
Dodge Dakota
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10/24/2002
23:55:55

Subject: Rough idle and sputter
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I was wondering if I could get some help from one of you experts out there...I have a 97 CC with the 5.2 and have been having a rough idle problem. After driving it to work this morning (about 15mi)I get into my parking spot and as I'm ready to shut off the truck, the rpms drop and the idle gets to the point where it seems like I have a performance cam or something. If I rev it up it smooths out then settles into the rough idle again. If I drive it like that it wants to sputter when shifting into 2nd (automatic tranny). Just this evening I was leaving class and during this upshift, it sputtered and even sounded like a pop from under the hood (a backfire of some sort??). That was the first time it ever done that. Can anyone out there please give me some idea what is causing this. I baby this thing (has ~69k on it) and I'm really hoping it's not going to cost me an arm, a leg, and a left nut. Sorry for the long post.

OJ



Nuckenfuts
Dodge Dakota
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10/25/2002
06:25:44

RE: Rough idle and sputter
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How about a full tune-up for starters dude.,cap,rotor,wires,plugs,oil,and filter,fuel filter.and mayby some injector cleaner.perhapse u could also check to make sure the plug connections at the injectors are secure and not corroded.



Pistolero
Dodge Dakota
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10/25/2002
09:57:42

RE: Rough idle and sputter
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Just a guess, since you said that it's idling rough...how about the IAC solenoid on the back of the throttle body? Has it been cleaned in recent history? Also, the injectors could be clogging up...I'd try the cheap stuff before I started spending money on it...another thing that comes to mind is possibly the cat going out, tap on the side of it and see if you hear a rattle...P



Jacque
Dodge Dakota
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10/25/2002
17:26:39

RE: Rough idle and sputter
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What kind of mods do you have on it? Is this problem occuring most all the time when you drive it or at certain times only? Is it worse when it is cold or when it warms up? Have you made any changes, repairs, or mods in the last few days or in the recent past? Was the truck bought new or used and have you done any tune-up work to it since you had it? We need more info to be of any assistance. Some basic things to check first off is changing the cap and rotor if needed. Check for bad spark plug wires(arcing) or crossed wires. Have you changed plugs lately and crossed the wires?



OJ
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10/25/2002
18:19:18

RE: Rough idle and sputter
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Sorry, guess I should have been more clear...The plugs, cap, rotor, and oil have been changed. The fuel filter is located in the tank and according to my maintenance manual (Hayes) it is part of the pump assembly. As for mods, I have a home brew cold air intake (been on for about 2 years). When I changed the plugs and wires I quadruple checked the routing and the proper location. As for checking the cat, I haven't thought about doing that. I also bought the truck brand new. As far as cleaning the IAC, I had that and the fuel system cleaned at around 30K miles. At that time all it did was the usual ping we all seem to have. I really appreciate your assistance and replies.

Thanks,
OJ



Jacque
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10/26/2002
14:04:01

RE: Rough idle and sputter
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Check to see if the distributor cap is on properly. If it is not setting flat on the dist. housing it can cause it to backfire. It can be a hassle sometimes to get it on right.
The stock wires probably need replacing with that many miles on it. Mine were done at about 50,000 miles when I noticed a drop in gas mileage. They could be arcing and causing misfires. Check for cracked and burnt wires.
If it were running lean for some reason it would cause it to backfire also. It could be a bad regulator or a stopped up fuel filter.
But, my guess is it is the wires or the cap is not on right.



OJ
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10/26/2002
21:35:11

RE: Rough idle and sputter
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Sorry, I also failed to mention that I also changed the wires along with the stuff I mentioned earlier (had a brain fart). I made sure I checked the cap after reading another post. It seems like it does it after being driven a while and it has sat and cooled anywhere from 45 min. to a couple of hours. I'm wondering if it's something going on with the intake manifold gasket or something in the throttle body that's sticking. I need to pick up some of that throttle body cleaner/combustion chamber cleaner and see what that does. Any suggestions on what cleaner to use??

Thanks,
OJ



BlueCC00RT
R/T
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10/28/2002
01:41:39

RE: Rough idle and sputter
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use SeaFoam... but then you will have to change your oil again... works Great!!!!... but be ready for a HUGE Cloud of smoke when you start it up... i went out to a country Road where i could take it for a spirited drive with out getting pulled over or my neighbors bitchin

http://w3.one.net/~roz/cars/z28/seafoam.html



Jacque
Dodge Dakota
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10/29/2002
12:13:50

RE: Rough idle and sputter
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What area of the country do you live? In some places, regular gas is of a poor quality. I put unleaded plus in my truck the other day and it perked it up. I was expecting to see any difference to be honest. I would try buying gas at a different station or upgrading to unleaded plus. There was a station in my area a few years ago that had regular unleaded gas that was so poor that it would turn the tailpipe sooty. I bought gas from that station just long enough to confirm my suspicions about the gas. Instead of going 275-325 on a tank of gas, you could only go 245. I know of a number of people here where I live that has spent money on their vehicles thinking that they had mechanical trouble that when they changed gas stations or upgraded to at least unleaded plus their problems went away.



Erik
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4/29/2003
02:27:12

RE: Rough idle and sputter
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My '94 5.2 is having the same problem. Mine stumbles and almost dies or goes ahead and dies after lifting off the throttle at lower speeds once the engine has warmed up. I also notice that when I lift off throttle completely at highway speed my RPM drops almost to 0 then recovers. I changed the fuel filter/qauntity sending unit/fuel pump/roll over valve/etc.(sorry, your Haynes is right, it is ALL one unit IN THE TANK) about a year ago and problem stopped. Problem is now returning though. I am dreading dropping the tank and doing that again, but if that is the fix(like it appears to be) I guess I will do it. I have also heard about the cat from several other posts, but have not had time, money, or inclination all together at the same time to try that fix. Before filter change, changed-cap, rotor, plugs, wires, IAC, some vacuum control device(forgot the name, been a few years, sorry) sprayed WD-40 around engine looking for vacuum leak, no help. The filter was the fix.



Phil
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4/29/2003
10:47:53

RE: Rough idle and sputter
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almost certain it's the pcv valve or related system.



waldo00o
Dodge Dakota
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4/29/2003
13:07:22

RE: Rough idle and sputter
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Even though the post below is old it explains alot.

Dan Craycraft
12/21/2001
21:09:20 RE: Intermittent Idle Stumbling!!!
Message:
I've had the problem discussed here since my truck was
new. The Dodge dealer did little to help, they changed
more parts than anyone can imagine but nothing fixed
the problem. I finally took it to the Jeep dealer who
works on my 93 Grand Cherokee 5.2 but also has a
year more experience with the 4.7. They fixed my
problem at 35,000 miles under warranty. The sticker on
my hood says part number 56040429-AH was used.
The tech told me the basic problem is the software
purges the evap canister at this point in the driving
cycle and is expecting a richer mixture due to the purge
but the canister is not providing that boost in fuel
(vapors) that the DC engineers expected. That means
the engine goes lean and stumbles - or stalls. I have
not had a stall since the upgrade. I actually think the
purge is now when you are moving but are off the gas.

The feeling of being bumped from behind is likely due
to the A/C compressor cycling on while stopped. The A/
C idle is about 50-100 RPM high than the non-A/C idle.
The increase is enough to feel like you got bumped.



FEE
Dodge Dakota
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6/18/2003
23:01:22

RE: Rough idle and sputter
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I AM CURRENTLY HAVING THE SAME PROBLEM, SPUTTERING AND BACKFIRING NOISE FROM UNDER THE HOOD FOR ABOUT 3-4 MINUTES WNTILL THE ENGINE WARMS UP AND WHEN I GIVE IT ALOT OF FUEL, ON MY 97 3.9L. SO FAR REPLACING SPARK PLUGS AND WIRES, DISTRIBUTOR CAP, COMPRESSION CHECKS, MOVING INJECTORS AROUND, AND CLEANING UPPER ENGINE COMPONETS HASN'T WORKED. MY MECHANIC IS CHECKING THE MANIFOLD GASKET THEORY NOW. IF IT WORKS I WILL POST LATER.



Darryl
Dodge Dakota
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6/19/2003
00:21:36

RE: Rough idle and sputter
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As for the stumbling at idle, I would think TPS(throttle position sensor). My truck started to stumble and try to shift out of overdrive (auto) at a steady cruise speed, it was the TPS. $72, and 20 minutes and runs like new.

My truck never did backfire, but check the TPS voltage (Haynes Manual).


Darryl



Geoff
GenIII
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6/19/2003
03:05:15

RE: Rough idle and sputter
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I had a similar sounding problem turned out to be a bad O2 sensor

Geoff
2000 3.9L RC Sport. Flame Red. 5-speed, 3.55, Airaid, Vortex Muffler, F&B 48mm TB, 180 T-Stat, Autolite 3923s, IAT Adjuster, Clear Corners, SS Grill Insert, JBA Plug Wires, Underdrive Crank Pulley. Hurst Shifter, Removed Clutch Fan, Sony CDX-MP450X MP3, JBA Headers

BlackDak
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6/19/2003
03:52:40

RE: Rough idle and sputter
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One thing you may want to think about is a common problem with all Magnum motors. You may be getting a vacuum leak in the intake belly pan. This type of leak is virtually undectectable from the outside of the engine, so it may be worth replacing if all else fails. I reccomend getting the intake gasket kit from Autozone. (Felpro Gaskets)



OO waldo
Dodge Dakota
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6/19/2003
12:47:35

RE: Rough idle and sputter
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congratulations Waldo, you got the death flash that retards the timing. And this post wasn't even about the 4.7 !



JasonB
Dodge Dakota
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6/19/2003
13:08:01

RE: Rough idle and sputter
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The 3.9L, 5.2L and 5.9L engines are notorious for poor idle and stall at idle when your battery is weak. Engine code for slow responce IAC is often given when battery is weak. This system is strongly dependent on the charging/starting systems being at normal output. Try a LOAD TEST on the battery.



Fee
Dodge Dakota
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6/22/2003
22:39:35

RE: Rough idle and sputter
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UPDATE. AFTER TRYING THE MANIFOLD THEORY AND PUTTING THE UPDATED TIMING CHAIN AND ASSEMBLY ON SPUTTERING AND BACKFIRE STILL PRESENT. MY MECHANIC SWITCHED SIDES WITH THE INJECTORS, INITIALLY MISFIRE WAS FROM CYLINDER #2 AND #6, NOW MISFIRE WAS PRESENT IN CYLINDER #1 AND CYLINDER #3. $900 LATER, BAD INJECTORS X 2. THE INJECTORS RUN $76 EACH.



mechtech
Dodge Dakota
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12/10/2003
17:08:50

RE: Rough idle and sputter
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I'm having rough idle and it feels like it hesitates a little during acceleration. This only happens when its cold. It gets better after it warms up. It is a 2003 SLT and has near 900 miles. The dodge dealer is telling me they are just cold natured and its going to idle rough. Are they giving me a line here??



chief08087
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12/10/2003
17:33:06

RE: Rough idle and sputter
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if u have j tech a week battery will make it run bad. OJ u said u heard a something like a backfire under the hood. sounds to me like u got a misfire goin on. look down ur throttle body and see if there is oil in the intake. if there is change the gasket. ur check engine light ever come on? pull all ur plugs out and look at them. do any of them look different than the rest? u could have some clogged injectors. that will give u a misfire. but that injector cleaner that u buy in stores isnt worth a damn. needs to be done right at a shop



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