Rough engine idle

Jay Meones
140

Asked by Jay May 28, 2008 at 08:10 PM about the 2001 Dodge Dakota 2 Dr Sport Standard Cab SB

Question type: Maintenance & Repair

Has anyone had this problem with their dodge 3.9L. I'll be driving at cruise speed and I can feel my truck chug, RPM's fluctuate, then goes back to normal. But continuously happens. I had the trucks fuel system cleaned and a major tuneup whicjh cost me $600. Waste of money cause the problem is still there.
I thought maybe it was the TPS but Dodge mechanics say there would be a code for that. I thought maybe the ICA but they said the same thing.
I am at my wits end with this problem. If anyone out there has had a similar problem with theer Dodge Dakota V6 please let me know.

Jay

16 Answers

John Honadel
105

hm.. thats a tough one.... are you sure they did the tune up and cleaned everything.... all of that point to tune up.... maybe it could your timing is off or maybe a clogged cat possibly... when does the truck have the condition all the time sometimes.... hot or cold at only a certin mph?

5 out of 5 people think this is helpful.
Jay Meones
140

Well they said they cleaned everything. Truck ran like a dream for about a day after tune-up. The condition is pretty much all the time. You know when you ease up on the gas pedal when you get to desired speed? Thats when it seems to do it. Hot or cold don't seem to matter. Warmer days are bad , cold days seems fine. I don't get it! I don't think it is the timing. Clogged converter? How could I tell?

7 out of 7 people think this is helpful.
Justin Doucette
1,655

It could be either of the sensors.... TPS or IAC, could even be something as simple as the PCV valve. I would put my money on the TPS, any decent shop should be able to test it for you. Check out www.Dakota-Durango.com, a lot of knowledgeable people over there if you have any other questions. BTW how did you manage to spend 600 bucks on a tune up?

3 out of 3 people think this is helpful.
littlehorn
26,325

The 3.9L engine does have a weird idle quality to it. However, it sounds like your problem may be related to a TPS or even an oxygen sensor misreading under load. It may not be enough to throw a code but it might cause the "chuggle" you're experiencing. Also look into the ignition module as a possible cause.

1 out of 1 people think this is helpful.
JAMisiaszek
30

I a simmilar problem my truck wont idle down, if I stop at a stop light my motor will rev at the same RPM I was crusing at it's very annoying I replaced the IAC with no luck. It happens when I have the AC on or if im towing my trailer. Im not sure what the next step is.

3 out of 3 people think this is helpful.
Charlie Beller
330

i agree, sound like tps sensor, if the speed is above say 35 or so and the truck gets into 4th gear the lock torque converter sound like it locking and unlocking due to false reading of the tps, this can happen in 3rg gear also.. try driving at a steady 50pmh with no load on the engine, just enough to maintain 50, if its seems like it drops 2-300 rpm on the tach and then goes back up, id bet money the tps is it..

1 out of 1 people think this is helpful.
Jay Meones
140

I changed the TPS now truck is running awsome. Thanks!

6 out of 6 people think this is helpful.
1MOPARMAN
70

JAY, I'M NOT AN EXPERT OR A MECHANIC, BUT...I'VE BEEN WORKING ON AUTOS FOR OVER 50 YRS. I PREFER THE PRE '70'S. THE MOPAR VEHICLES HAVE OBD'S=ON BOARD DIAGNOSTICS CHECKED WITH THE IGNITION. I AM A MOPAR MAN & I SUGGEST THAT YOU GO TO YOUR TRUCK...TURN IGNITION KEY TO "ON"-NOT START-OFF...ON...OFF...ON. AFTER THE 3rd ON CYCLE...WATCH THE DASH. WITH A PEN...WRITE THE DTC/DTC'S THAT WILL BE DISPLAYED IN A CYCLE-USUALLY A CHECK ENGINE LIGHT OR SIMILAR LIGHT. IT WILL FLASH 1 TIME...THEN 2 TIMES...1 TIME...2 TIMES-12 CODE IS THE CODE FOR EMC POWER INTERRUPTION CODE. THE NEXT FLASHES... COUNT. i.e.: 2 FLASHES...PAUSE...4 FLASHES...PAUSE...5 FLASHES...PAUSE...5 FLASHES=55 CODE=END OF DTC CHECK. THE ECM TELLS YOU THERE IS A "24" DTC . THIS CODE MEANS TO CHECK THE TPS=THROTTLE POSITION SENSOR. OTHER CODES DISPLAYED WILL REQUIRE YOU TO CHECK A DTC LIST FOR YOUR TRUCK. I HOPE THIS HAS HELPED. DOING THIS WILL SAVE YOU A TON OF $$$$. I JUST WISHED YOU HAD THIS INFOR BEFORE YOU SPENT $600 ON A "TUNEUP" FOR 1 DAY OF TROUBLE FREE DRIVING.

1 out of 1 people think this is helpful.
cavvet1
10

can someone tell me where the tps is located and how hard is it to change

1 out of 1 people think this is helpful.
1MOPARMAN
70

THE TPS...THROTTLE POSITION SENSOR...IS LOCATED ON THE DRIVER'S SIDE OF THE THROTTLE BODY-NATURALLY ASPIRATED-ENGINES IN THE '92 DAKOTA V-6. PULL OFF THE AIR CLEANER HOUSING...SET ASIDE...LOOK AT THE TH-BODY. THE TPS IS ATTACHED AT THE END OF THE THROTTLE SHAFT OF THE T-B. IT IS PART OF AN OVAL/ROUND SHAPED "PROTRUSION" OUT FROM THE T-B-STICKING OUT ABOUT 1". THE TPS IS ATTACHED TO IT WITH 2 TORX SCREWS. IT IS ABOUT 1-1/2" IN WIDTH WITH THE MALE CONNECTOR REMOVED. BE SURE TO DISCONNECT THE NEG TERMINAL WHEN REMOVING CONNECTOR TO PREVENT AN ACCIDENTAL SPARK THAT MAY IGNITE ANY "POOLED" GASOLINE.

2 out of 2 people think this is helpful.
1MOPARMAN
70

I'M NOT A PRO MECH BUT...I JUST HAD PROBLEMS WITH A BAD "IAC"-IDLE AIR CONTROL VALVE & THAT'S HOW MY DAKOTA ACTED FROM TIME TO TIME-GENERALLY AT ACCELERATION BUT, SMOOTHED OUT @ 60mph. THE IAC HAS A "PENTIL" THAT MOVES BACK & FORTH-WHEN ENERGIZED-GETTING A SIGNAL FROM THE TPS THRU THE ECM. AT IDLE THE PENTIL STAYS IN TO RESTRICT AIR FLOW. AS THE TPS MOVES OPEN...SO DOES THE PENTIL OPEN UP ALLOWING A "FREE-FLOW" OF AIR THROUGH THE AIRHORN. THE CAT CONV'R-IF "RESTRICTING"-WILL CAUSE THE ENGINE TO BACK UP IN PRESSURE-PREVENTING THE FREE EXHAUST FLOW-SLOWING THE RPMS DOWN. AS THE RESTRICTION "LIFTS"-OPENS UP-SO WILL THE RPM'S.

Justin Doucette
1,655

To the guy that wrote this..... "JAY, I'M NOT AN EXPERT OR A MECHANIC, BUT...I'VE BEEN WORKING ON AUTOS FOR OVER 50 YRS. I PREFER THE PRE '70'S. THE MOPAR VEHICLES HAVE OBD'S=ON BOARD DIAGNOSTICS CHECKED WITH THE IGNITION. I AM A MOPAR MAN & I SUGGEST THAT YOU GO TO YOUR TRUCK...TURN IGNITION KEY TO "ON"-NOT START-OFF...ON...OFF...ON. AFTER THE 3rd ON CYCLE...WATCH THE DASH. WITH A PEN...WRITE THE DTC/DTC'S THAT WILL BE DISPLAYED IN A CYCLE-USUALLY A CHECK ENGINE LIGHT OR SIMILAR LIGHT. IT WILL FLASH 1 TIME...THEN 2 TIMES...1 TIME...2 TIMES-12 CODE IS THE CODE FOR EMC POWER INTERRUPTION CODE. THE NEXT FLASHES... COUNT. i.e.: 2 FLASHES...PAUSE...4 FLASHES...PAUSE...5 FLASHES...PAUSE...5 FLASHES=55 CODE=END OF DTC CHECK. THE ECM TELLS YOU THERE IS A "24" DTC . THIS CODE MEANS TO CHECK THE TPS=THROTTLE POSITION SENSOR. OTHER CODES DISPLAYED WILL REQUIRE YOU TO CHECK A DTC LIST FOR YOUR TRUCK. I HOPE THIS HAS HELPED. DOING THIS WILL SAVE YOU A TON OF $$$$. I JUST WISHED YOU HAD THIS INFOR BEFORE YOU SPENT $600 ON A "TUNEUP" FOR 1 DAY OF TROUBLE FREE DRIVING. " First of all..... every vehicle since the late 80's has had an OBD system not just mopars, in fact I believe it was mandatory by 1991. Only 2000 and up Dakotas have the key trick to read DTC which you mentioned... The odometer flashing is only used on OBDI vehicles (95 and earlier). On OBDII vehicles the codes are listed as a PXXXXX number

1 out of 1 people think this is helpful.
1MOPARMAN
70

I WILL DISAGREE WITH YOU ON "Only 2000 and up Dakotas have the key trick to read DTC which you mentioned... ". I HAVE AN '87 DAYTONA & A '92 DAKOTA. BOTH WILL SHOW OBD CODES WITH THE "KEY TRICK" METHOD. THE FLASHING WILL BE DISPLAYED VIA "DTC/DTC'S THAT WILL BE DISPLAYED IN A CYCLE-USUALLY A CHECK ENGINE LIGHT OR SIMILAR LIGHT." AS MENTIONED IN MY RESPONSE-NOT AN ODOMETER LIGHT FLASHING. WITH ALL OBDII VEHICLES...YOU WILL NEED A CODE READER...THAT WILL GIVE YOU THE APPROPRIATE "P" CODE. I "AM" AWARE OF THIS PROCEDURE. THANX

Justin Doucette
1,655

You do not need a code reader for all OBDII vehicles.... as I mentioned 2000 and up Dakotas (and many other vehicles) use the same key trick to display the codes on the digital odometer screen. I did not mean to say odometer flashing for OBDI vehicles, it is the CEL that flashes. I know for a fact the key trick does not work on 97-98 and 99 Dakotas/Durangos, disagree all you want. I can not speak with any certainty on anything older than that. If you are aware of the procedure you did a poor job explaining it. This thread was about a 2001 Dakota, so the OBDI procedures are completely irrelevant. Also if you bring your attention to the left side of your keyboard, just above the "Shift" key... there is a button marked "Caps Lock", do everyone a favour and push it

1 out of 1 people think this is helpful.
1MOPARMAN
70

THANX FOR YOUR UPDATE. THANX FOR YOUR ADVICE ON "CAPS". I REALIZE THAT "CAPS" IS RELATED TO "SHOUTING" ON THE I-NET. WHAT I DON'T UNDERSTAND...WITH THE "PURISTS" ON THE I-NET...IS THE DIFFERENCE WITH "CAPITAL ENGLISH" & "LOWER-CASE ENGLISH". ENGLISH IS ENGLISH. ADVERTISING...LABELING...SIGN POSTS...INTERSTATE ROAD SIGNS...ROAD SIGNS...AUTO BADGES...CREDIT CARDS...DRIVER'S LICENSES...& PRODUCT BADGES ARE ALL IN CAPS........WHERE'S THE PROBLEM?! THE ONLY "SHOUTING" I SEE IS WHAT SPORTS FANS & HUSBANDS & WIVES DO. BEEN DOING IT SINCE 1994. DON'T THINK PUSHING THE "CAP" KEY IS DOING ANYONE A FAVOR...JUST GIVING "CONTROL" TO THOSE WHO THINK THEY NEED IT.

2 out of 2 people think this is helpful.
marcosrz
0

I have a 2005 Nissan maxima, i think am having the same problem . Can it also be the Tps on my car?

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