DODGE RAM FORUM - Ram Forums and Owners Club! - Dodge Truck Forum

Go Back   DODGE RAM FORUM - Ram Forums and Owners Club! - Dodge Truck Forum > Dodge Ram Forum - Help Zone - Dodge Ram Problems, Complaints, & Solutions - Maintenance & Re > 3RD Generation Dodge Ram 2002 to 2008 Dodge Ram Trucks > Powertrain > 4.7L PowerTech V8 Specific Topics


Notices


Latest Vendor News
AutoAnything
Addictive Desert Designs!
United Radio
Bayou Goat Mounts

Reply
 
Thread Tools
  #1  
Old 08-31-2013, 11:15 PM
btah btah is offline
Dodge Ram Forum Newcomer
 
Join Date: Aug 2013
Location: Chicago
Posts: 14
Gender: Male
Vehicle: 2003 Dodge Ram 1500 SLT
Color: black
Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
Rep Power: 0
Rep:10
btah is on a distinguished road
Default RPM fluctuation / idle issue

Hello, new to the forum. I hope through this post we can narrow down my problem and also help some other along the way that might be searching for a resolution.

The problem:
My truck will sometimes die at idle, lets say once out 30 trips around town. It will also feel like it is going to die and I have to pump the gas for a few seconds to get it back to normal, usually when just pulling away, say once every 15 trips around town. If I am in park and try to keep the idle at 1000RPM I will get hesitation and surging between 900 to 1100 RPM. Also, if I try to keep it at 1000RPM and turn the wheel to add some load, the idle will drop to @600RPM and surge to@1200 RPM when I let go of the wheel. IF I am in drive, other than the occasional die I can't reproduce the hesitation and surging if I keep it at 1000RPM. No codes (using the key on-off 3 times and also the trip button while turning the key on methods).

Here is what I have done to try to solve the problem (truck has 66,000 miles):
plugs
oxygen sensors
TPS
PCV
removed and cleans TB and IAC, neither of which struck me as being very dirty.

Most of the posts I read say "replace the TPS" or "replace the IAC" without a whole lot of explanation behind the suggestion. To help with the investigation I did the following tests:
TPS unhooked
IAC unhooked
TPS and IAC unhooked
TPS and IAC both hooked up

Results:
TPS unhooked and IAC hooked up
Idles a little rough at 600 RPM
If I keep it at 1000RPM it stays pretty steady. If I turn the wheel it will drop to about 900 RPM and surge to @1100 RPM when I let go of the wheel.

TPS unhooked and IAC unhooked
Idles rough at about 400RPM
harder to start
If I keep it at 1000RPM is stays pretty steady . If I turn the wheel it will drop to about 900 RPM and surge to @1100 RPM when I let go of the wheel.

I just realized the results of the above two are pretty much the same except for the initial idle.

TPS hooked up and IAC unhooked
much harder to start, need to give some gas to keep it going initially.
If I keep the idle at 1000RPM it hesitates and surges between 900RPM and 1100RPM. If I turn the wheel it will drop to @600RPM and when I let the wheel go it surges back to @1200RPM and then back to 1000RPM.

Both hooked up
Starts fine and idles smooth at 600RPM.
If I try to keep it at 1000RM it fluctuates between @900 to @1050 RPM. If I keep it at 1000RPM and turn the wheel it drops to @600RPM and then surges back to @1200 RPM before returning to 1000RPM.

I just realized the results of the above two are pretty much the same except for the initial idle.

So, I am not sure what to make of all that. Anyone have any thoughts? And, thanks in advance
Reply With Quote
Sponsored links
  #2  
Old 09-01-2013, 04:54 AM
RogerRamJet's Avatar
RogerRamJet RogerRamJet is offline
God Bless Texas!




 
Join Date: May 2013
Location: Mansfield, TX
Age: 50
Posts: 11,363
Gender: Male
Vehicle: 2005 Ram 1500
Trim Level: Lonestar QC
Color: White
Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
Rep Power: 12
Rep:2929
RogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond repute
Default

I have the same engine and can address the surging when you turn the wheel. That is the power steering pump wanting more power so the computer gives it a little more. As far as the truck wanting to die at idle, mine has done that on occasion, and I chalk it up to that's just what it does. Doesn't happen as often as yours, but it has happened.
I gotta ask, why are you trying to keep your idle at 1000rpm? Mine idles great between 5 & 6.
__________________
Life is hard... It's harder if you're stupid!
Today is a good day to be a RAM owner!
Reply With Quote
  #3  
Old 09-01-2013, 12:02 PM
btah btah is offline
Dodge Ram Forum Newcomer
 
Join Date: Aug 2013
Location: Chicago
Posts: 14
Gender: Male
Vehicle: 2003 Dodge Ram 1500 SLT
Color: black
Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
Rep Power: 0
Rep:10
btah is on a distinguished road
Default

I don't think I was real clear on keeping the idle at 1000. My normal idle is around 600. I don't experience any fluctuations if I just leave my foot off the gas. However, if I raise the idle slightly by keeping my foot steady on the gas, I experience the fluctuations. It seems that if I try and keep it around 1000 I see the most fluctuation. The higher I raise it about 1000 I see less an less fluctuation. If I get up to about 2000 the fluctuations almost go away. So, foot off the gas, pretty good idle. Try to keep it around 1000 the RPM fluctuate.
Reply With Quote
  #4  
Old 09-01-2013, 12:04 PM
btah btah is offline
Dodge Ram Forum Newcomer
 
Join Date: Aug 2013
Location: Chicago
Posts: 14
Gender: Male
Vehicle: 2003 Dodge Ram 1500 SLT
Color: black
Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
Rep Power: 0
Rep:10
btah is on a distinguished road
Default

Also, it may just be a progression of the issue but we have had a few really warm days over the last week and it seems like the issue is slightly worse.
Reply With Quote
  #5  
Old 09-01-2013, 07:22 PM
RogerRamJet's Avatar
RogerRamJet RogerRamJet is offline
God Bless Texas!




 
Join Date: May 2013
Location: Mansfield, TX
Age: 50
Posts: 11,363
Gender: Male
Vehicle: 2005 Ram 1500
Trim Level: Lonestar QC
Color: White
Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
Rep Power: 12
Rep:2929
RogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond repute
Default

With the heat making it worse, that points to the AIT (Air intake temp.) sensor.
__________________
Life is hard... It's harder if you're stupid!
Today is a good day to be a RAM owner!
Reply With Quote
  #6  
Old 09-01-2013, 09:15 PM
btah btah is offline
Dodge Ram Forum Newcomer
 
Join Date: Aug 2013
Location: Chicago
Posts: 14
Gender: Male
Vehicle: 2003 Dodge Ram 1500 SLT
Color: black
Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
Rep Power: 0
Rep:10
btah is on a distinguished road
Default

Thank you for the response. I'll search around but do you know if there is a way to test it? Being a temp sensor I doubt it but the question is worth a shot. Maybe functionally testing it like unhooking it?
Reply With Quote
  #7  
Old 09-01-2013, 09:21 PM
btah btah is offline
Dodge Ram Forum Newcomer
 
Join Date: Aug 2013
Location: Chicago
Posts: 14
Gender: Male
Vehicle: 2003 Dodge Ram 1500 SLT
Color: black
Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
Rep Power: 0
Rep:10
btah is on a distinguished road
Default

And just to be sure, the AIT is the one plugged into the big black box (that's a technical term) on the top of the motor, right?
Reply With Quote
  #8  
Old 09-02-2013, 12:49 AM
RogerRamJet's Avatar
RogerRamJet RogerRamJet is offline
God Bless Texas!




 
Join Date: May 2013
Location: Mansfield, TX
Age: 50
Posts: 11,363
Gender: Male
Vehicle: 2005 Ram 1500
Trim Level: Lonestar QC
Color: White
Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
Rep Power: 12
Rep:2929
RogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond repute
Default

Quote:
Originally Posted by btah View Post
And just to be sure, the AIT is the one plugged into the big black box (that's a technical term) on the top of the motor, right?
Don't wanna get too technical now, so we'll go with the big black box, yes. Pull it out and clean it up a bit. See if that helps any.
__________________
Life is hard... It's harder if you're stupid!
Today is a good day to be a RAM owner!
Reply With Quote
  #9  
Old 09-02-2013, 02:14 PM
btah btah is offline
Dodge Ram Forum Newcomer
 
Join Date: Aug 2013
Location: Chicago
Posts: 14
Gender: Male
Vehicle: 2003 Dodge Ram 1500 SLT
Color: black
Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
Rep Power: 0
Rep:10
btah is on a distinguished road
Default

It is spotless.
Reply With Quote
  #10  
Old 09-06-2013, 08:04 PM
btah btah is offline
Dodge Ram Forum Newcomer
 
Join Date: Aug 2013
Location: Chicago
Posts: 14
Gender: Male
Vehicle: 2003 Dodge Ram 1500 SLT
Color: black
Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
Rep Power: 0
Rep:10
btah is on a distinguished road
Default

any other thoughts?
Reply With Quote
Reply

Bookmarks

Tags
iac, idle, idle air control valve, throttle position sensor, tps

Thread Tools

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

Forum Jump


Advertisement






All times are GMT -4. The time now is 04:38 PM.


= Copyright RamForumZ.com a Gigathreads.com Network Site =Ad Management by RedTyger
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
vB.Sponsors


=Gigathreads Network=
CLUBS MOPAR NATION DSM GPMM MAMM JAM
DIESEL Diesel Forum      
CHEVY Chevy Camaro Forum Chevy Volt Forum    
CHRYSLER Chrysler 300C Forum      
DODGE Dodge Avenger Forum Dodge Caliber Forum Dodge Challenger Forum Dodge Charger Forum
  Dodge Circuit Forum Dodge Hornet Forum Dodge Magnum Forum Dodge Nitro Forum
  Dodge Ram Forum Dodge Dakota Forum Dodge Durango Forum Dodge Dart Forum
FORD Ford Raptor Forum Ford F150 Forum Ford F100 Forum  
JEEP Jeep Forum      
PONTIAC Pontiac G8 Forum      
SRT SRT Viper Forum SRT Cuda Forum