Surging Idle When Rolling ('05 Manual)

[GGranahan]

my 2005 3500 surges from 550 rpm to 900 rpm when i push in the clutch and kick it into neutral only while rolling. it seems to get worse when i brake. as soon as i stop the idle goes to 750rpm and if you rev the motor it will perfectly return to 750rpm. the dealer says they can't do anything til the check engine light comes on. my truck only has 900 miles on it and it is 10 months old , i hate driving it like this , sometimes it feels like it is going to stall out.



3500 is a manual trans. diesel xcab



also have 2 other trucks which do NOT do this!

1996 3500 Dual Wheel Cummins Diesel 4X4 Manual Trans Xcab

1999 2500 Cummins Diesel 4X4 Manual Trans



My old 1991 W350 4X4 Diesel Auto Trans never did this either.



How do we make Chrysler aware of this problem and get some action?



I can't believe that I purchased a $40,000 truck that is supposed to be superior to my '96 and '99 models and it fluctuates rpms like a yo-yo. Oo.



I am suspicious that the computer is programmed for a automatic trans that has a constant load on the system rather than a manual trans. Is there just one ECM program for all trucks or is there a different one for a manual trans and an automatic trans?



Give me some feed back!

 

[mberry]

A lot of the 3rd gen's do this. Mine did and/or still does it and seems to be more noticeable when the A/C compressor is running. I don't even notice it anymore. I believe there are different programs for manual and auto trans.



My free advice is to give it some time and miles to let the engine get a bit more broken in.

 

[TSpecht]

Mine's been doing that for all ~17000 miles of it's life. Mine doesn't start doing the fluctuate thing while moving until I hit the brake with the engine at idle (clutch in or coasting in neutral). I'm not overly concerned about it since once at a complete stop, idle speed is a rock solid 750 RPM. I think I recall a thread recently about the same thing with autos, but I could easily be mistaken on that.

 

[rbattelle]

Read this.



-Ryan