Surging a torque converter problem? - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
Home Forum Market Place Garage Lounge (7) Tuning Library DTC Tool Register Vendors
Go Back   Diesel Place : Chevrolet and GMC Diesel Truck Forums > GM Transmissions > Allison OEM
Register FAQ Forum Rules My Replies My Threads Mark Forums Read Auto EscrowAuto LoansInsurance

DieselPlace.com is the premier Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools
Old 05-13-2008, 11:28 PM   #1 (permalink)
Siphon
Diesel Specialist
 
Join Date: Feb 2005
Location: Olympia, WA
Posts: 610
iTrader Score: 0 reviews

Surging a torque converter problem?

Is it possible for a converter on its way out to cause an intermittent engine surge?

Background... I have had an intermittent engine surge that's been slowly becoming more frequent and severe. In D, sitting at a stoplight, the engine will rev progressively higher, trying to take off on its own. Let off on the brake and it jumps forward. Once the surge starts, the engine also responds erratically to go-pedal input while underway. Push the pedal and it doesn't respond for a few seconds, then really takes off. Have the performance equipment listed in my sig. The surge worsens when I turn the box up. Still there, but not as bad, at the stock setting.

I think this is a fuel pressure regulator problem, but took it to a local shop (not dealer, pretty sketchy Dmax knowledge, but my only option) to see what they could find out. Mechanical diagnostic and generic code reader only (no Tech II). They found no fuel pressure issues, but they were not able to duplicate the surge problem. They suggest the converter hypothesis, which sounds idiotic to me but I've been wrong before.
__________________
03 GMC D/A EC SB SLT Carbon metallic
MODS: Bilsteins, Quad tuned w/Commander monitor, Cognito braces, FABTECH tie rods, JVC EXAD LHX550, 130,000mi and counting, and St. Bernard drool on the window
Objects in mirror are closer than they appear... But not for long.
Offline  
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 05-14-2008, 01:52 PM   #2 (permalink)
Mike L.
Supporting Vendor
 
Join Date: Oct 2003
Posts: 11,356
iTrader Score: 0 reviews

Converters don't surge. Sounds like a fuel problem.
Offline   Reply With Quote Quick reply to this message
Old 05-14-2008, 04:02 PM   #3 (permalink)
Tony Singer
Diesel Fanatic
 
Join Date: Mar 2006
Location: Blanchester, OH
Posts: 53
iTrader Score: 0 reviews

Check the engine harness connector on the top drivers side of the motor. Mine was doing the same thing for two months before we figured out it was just barely loose. The blue part that holds the wires in was out about an 1/8 inch. Got it pushed back in and everything has been fine for over a month now. Just an idea.
__________________
2005 GMC Crew Cab LLY
Silver Birch Metallic
315-70-17 BFG AT on Chrome H2's
Auto Meter boost & pyro gauges
4" straight pipe, EGR Blocker Plate, PCV Re-route, Tie rod sleeves, PPE Standard, Carter lift pump
Western 7.5' plow
Offline   Reply With Quote Quick reply to this message
Old 05-14-2008, 04:10 PM   #4 (permalink)
Crafty1
Diesel Master
 
Join Date: Dec 2004
Location: Indianapolis
Posts: 1,707
iTrader Score: 0 reviews

Torque Converter won't make the engine rev up. It can place additional load on the engine, but the engine fuels to MAINTAIN idle speed.

Look for an engine control issue.
Offline   Reply With Quote Quick reply to this message
Old 05-14-2008, 06:01 PM   #5 (permalink)
Diesel Tech
Diesel Master
 
Join Date: Sep 2003
Location: USA
Posts: 4,486
iTrader Score: 0 reviews

I would start by removing the programming and going back to stock. If the problem goes away you've pretty much located the issue. If not as was mentioned check the two large connectors on the driver side valve cover. We have seen them come loose and cause very strange issues. Remove the connection and look at the pins, they should all be the same height. f not reach in with a small pliers and gentle pull on the pins that are pushed down until they are at the right height.
__________________
2004.5 LLY SC 2wd
2006 LBZ CC 4wd
TTS rods, camshaft, heads and pistons in the motor and a TTS Converter and transmission upgrade kit in the transmission
Offline   Reply With Quote Quick reply to this message
Old 05-15-2008, 01:03 AM   #6 (permalink)
Siphon
Diesel Specialist
 
Join Date: Feb 2005
Location: Olympia, WA
Posts: 610
iTrader Score: 0 reviews

Thanks, all. I'll pull the bale connectors and see what I can see. If not, have to drag the box off and see what a trip to the dealer will tell me.
__________________
03 GMC D/A EC SB SLT Carbon metallic
MODS: Bilsteins, Quad tuned w/Commander monitor, Cognito braces, FABTECH tie rods, JVC EXAD LHX550, 130,000mi and counting, and St. Bernard drool on the window
Objects in mirror are closer than they appear... But not for long.
Offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Diesel Place : Chevrolet and GMC Diesel Truck Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

PLEASE READ! You must check your email inbox for the confirmation link to complete registration. Please check your spam box if you do not see the email in your inbox.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
torque converter problem T-Bone24 4L80/85E Transmissions. 6L90 Transmission 3 02-27-2011 08:23 PM
torque converter problem? SWHdmax Allison OEM 2 01-20-2011 07:28 PM
Possible Torque Converter Problem? Big Katz Allison OEM 16 09-15-2009 01:54 PM
torque converter problem maybe? Jeromy Allison OEM 13 06-04-2007 09:38 AM
Torque converter problem? stout9955 Allison OEM 5 08-04-2006 02:43 PM


All times are GMT -4. The time now is 02:30 AM.


Shoutbox provided by vBShout v6.2.1 (Lite) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
© AutoGuide

SEO by vBSEO 3.6.0