rpm fluctuation - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
 
Thread Tools
#1 Old 05-03-2008, 03:46 PM
omeeomy
Registered User
 
Join Date: Feb 2004
Posts: 64
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
rpm fluctuation

i have a 2001 durango with the 4.7 can any one tell me why my rpms fluctuate 3 to 4 hundred all the time cruse on /off its getting worse and does it all the time
omeeomy is offline  
Sponsored Links
Advertisement
 
#2 Old 05-03-2008, 03:52 PM
qtipextra
^BIG D^
 
qtipextra's Avatar
 
Join Date: Oct 2005
Location: Idaho Falls
Posts: 2,279
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Have you changed your spark plugs in a while?

"Big D" - SOM Feb '10
Black 2003 Dodge Durango Sport 4.7L 4X4 4.56:1 Auburn LSD

Interior: Double DIN Pioneer HU - 141.7 dB Sound System - Dash Mat - Blue L.E.D Interior Lighting - Blue Gauge Backlighting - Audiovox 2-Way Remote Start - 6 Gauge Cluster Swap
Exterior: Black 1 Piece DEPO headlights - 55W DDM 5000K HID 9007 BiXenon - Hella Optilux 2500 Driving lights - 55W DDM 5000K HID H3 - 3rd Brake light decal "BIG D" - Dodge Hitch/Cover - Dodge Logo on Tinted Tails - Stainless Steel Bar Grill Inserts - Gibson 4" Exhaust Tip
Performance: Dynomax Bullet Muffler - Flowmonster High Flow Catalytic Converter - Chrome Intakes CAI - Superchips 3715 at 91 Octane - NGK V-Power Plugs
Tires/Wheels/Lift: 3" PA Body Lift - 2" T/S Lift - 33 X 11.5 X 16 Firestone Destination M/T Tires - MB Gunner 6 Gun metal gray 16X8 rims
Drivetrain: Rebuilt 545RFE Trans with Transgo Shift Kit - 4.56:1 R/P Motive gears - Auburn High Performance LSD


My Truck Domain

qtipextra is offline  
#3 Old 05-03-2008, 04:01 PM
omeeomy
Registered User
 
Join Date: Feb 2004
Posts: 64
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
no do you think that is the problem
i was hoping its not my cadaletic converters plugging up
omeeomy is offline  
#4 Old 05-03-2008, 04:05 PM
omeeomy
Registered User
 
Join Date: Feb 2004
Posts: 64
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
did your sc help with fuel i have the 4.7 in mine and having a hard time finding a programer for the 2001 durango with the 4.7
omeeomy is offline  
#5 Old 05-03-2008, 05:11 PM
mprtech
Registered User
 
Join Date: Feb 2006
Location: Milwaukee
Posts: 64
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If the engine is not missing and you are experiencing just an rpm fluctuation, I would check the TPS. With the engine at idle, lightly tap on the TPS with the handle of a screwdriver. If the idle rpm changes when you tap, then most likely the TPS is dirty internally and needs to be replaced. Ideally the best way to check this is while a DVOM is attached but usually these are bad enough that you will be able to hear the RPM change.

There are many other possible reasons also though.
mprtech is offline  
#6 Old 05-03-2008, 06:09 PM
dodgefan360
Platinum 2K R/T
 
dodgefan360's Avatar
 
Join Date: Jan 2005
Location: Kitchener
Posts: 4,037
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
TPS cured the idling problem for me a couple years ago. My case was that I let it go for so long (half a year), to the point when I had cruise on one afternoon, the transmission was shifting down to third - going downhill! Another cause could be a dirty IAC (Idle Air Controller), located on the back of the throttle body.

qtip is correct as well, if you haven't changed the plugs in the last 30K or so it's time to change them out. Copper plugs are only good for about 25-30K unless you know your running long life plugs.

2000 5.9 R/T - Platinum
144,000m (233,000kms)
Amsoil in the diffs, transfer case and engine - Hughes Plenum - Fastman 52mm TB - K&N FIPK - SCT tuner currently set at 87 octane - Magnaflow 15659 exhaust

My 2000 R/T
2000 R/T Factory service Manual
dodgefan360 is offline  
#7 Old 05-03-2008, 06:13 PM
qtipextra
^BIG D^
 
qtipextra's Avatar
 
Join Date: Oct 2005
Location: Idaho Falls
Posts: 2,279
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by omeeomy
did your sc help with fuel i have the 4.7 in mine and having a hard time finding a programer for the 2001 durango with the 4.7
It did. I notice about 1mpg or a little more increase. SC is the only programmer available for the 4.7 that is any good. The JET performance one will eventually be bypassed by the computer (From what I have heard). I will be going a step colder on my plugs here soon and I will bump the superchips program to the 91 octane setting for even better performance and we will see if mileage is helped further with the combo of the new plugs as well as the higher performance setting. But lets be real here, I didn't get the SC for the mileage increase

"Big D" - SOM Feb '10
Black 2003 Dodge Durango Sport 4.7L 4X4 4.56:1 Auburn LSD

Interior: Double DIN Pioneer HU - 141.7 dB Sound System - Dash Mat - Blue L.E.D Interior Lighting - Blue Gauge Backlighting - Audiovox 2-Way Remote Start - 6 Gauge Cluster Swap
Exterior: Black 1 Piece DEPO headlights - 55W DDM 5000K HID 9007 BiXenon - Hella Optilux 2500 Driving lights - 55W DDM 5000K HID H3 - 3rd Brake light decal "BIG D" - Dodge Hitch/Cover - Dodge Logo on Tinted Tails - Stainless Steel Bar Grill Inserts - Gibson 4" Exhaust Tip
Performance: Dynomax Bullet Muffler - Flowmonster High Flow Catalytic Converter - Chrome Intakes CAI - Superchips 3715 at 91 Octane - NGK V-Power Plugs
Tires/Wheels/Lift: 3" PA Body Lift - 2" T/S Lift - 33 X 11.5 X 16 Firestone Destination M/T Tires - MB Gunner 6 Gun metal gray 16X8 rims
Drivetrain: Rebuilt 545RFE Trans with Transgo Shift Kit - 4.56:1 R/P Motive gears - Auburn High Performance LSD


My Truck Domain

qtipextra is offline  
#8 Old 05-03-2008, 06:55 PM
2000DurangoTech
Will Work for 3" Lift
 
2000DurangoTech's Avatar
 
Join Date: Jan 2006
Location: San Diego
Posts: 239
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Just wanted to confirm the TPS check that others mentioned. Mine did the same thing, fluctuating RPM's while driving or idling, and then to the point of actually not allowing me to go faster than 50MPH JUST BEFORE entering the desert on my San Diego - Denver trip. Boy was I lucky it happened before entering no-mans-land. Anyway, there was an autozone where I pulled off the freeway at 11PM, so I just waited 7 hours until the manager got in who sold me the last TPS they had. $40 later and I was on the road again, returning safely a week later.

2000 Dodge Durango SLT
4x4 4.7L V8
K&N Drop-in Filter
Monroe Reflex Shock Absorbers
2" T/S Lift
Xenon headlights
32x11.5 BFG All-Terrain T/S KO x4
Black Leather Interior
Power Everything
Patriot Blue Exterior

2000DurangoTech is offline  
#9 Old 05-05-2008, 12:45 PM
mrp
Registered User
 
Join Date: Mar 2007
Location: Hollister
Posts: 53
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
dah, what a TPS?
mrp is offline  
#10 Old 05-05-2008, 12:47 PM
2000DurangoTech
Will Work for 3" Lift
 
2000DurangoTech's Avatar
 
Join Date: Jan 2006
Location: San Diego
Posts: 239
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Throttle Position Sensor. It's what recognises how much throttle you're currently giving, based on the position of the throttle body.

2000 Dodge Durango SLT
4x4 4.7L V8
K&N Drop-in Filter
Monroe Reflex Shock Absorbers
2" T/S Lift
Xenon headlights
32x11.5 BFG All-Terrain T/S KO x4
Black Leather Interior
Power Everything
Patriot Blue Exterior

2000DurangoTech is offline  
#11 Old 05-05-2008, 01:11 PM
omeeomy
Registered User
 
Join Date: Feb 2004
Posts: 64
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
hey you guys rock cleaned my iac and found a cracked line in my evaporator lines runs like big d should thanks a bunch
omeeomy is offline  
Closed Thread


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Anyone Running 212X's Here?? Maybe a Sound Clip Wasinger12 3G Dodge Ram Performance Talk 35 10-29-2007 08:45 PM
Can someone explain gear ratio's to me? Black07-4x4Quad 3G Dodge RAM - Drivetrain Talk 8 05-16-2007 10:12 AM
How a Torque Converter works......... Rob 3G Dodge Ram Performance Talk 2 03-31-2006 07:01 AM
Some long/short Header 'guesstimating' HankL 2G Dodge Ram Performance Talk 4 06-13-2005 10:33 AM
How Fast Am I Going one short of 3G Dodge RAM - Drivetrain Talk 85 06-12-2005 06:15 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

 
For the best viewing experience please update your browser to Google Chrome