Stumble off the line. - Chevy Impala SS Forum
Impala SS Forum
Go Back   Chevy Impala SS Forum > 91-96 Impala/B-body > Engine Problems/Maintenance
New User? Register - Forgot Password

Reply
 
Thread Tools Display Modes
  #1  
Old 01-28-2013, 07:58 AM
9c1twiggy 9c1twiggy is offline
Junior Member
 
Join Date: May 2011
Posts: 4
9c1twiggy is on a distinguished road
Default Stumble off the line.

94 caprice 9c1.
I had a cracked head, so I replace them with stock heads that were milled .015. While I was at it, I did the home plate delete, put super comp hooker headers on, air pump delete and deleted the egr tube from the header to the back of the intake.


Sent from AutoGuide.com App
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 01-28-2013, 07:59 AM
9c1twiggy 9c1twiggy is offline
Junior Member
 
Join Date: May 2011
Posts: 4
9c1twiggy is on a distinguished road
Default Stumble off the line.

And not it stumbles bad off the line. And seams slower overall.


Sent from AutoGuide.com App
Reply With Quote Quick reply to this message
  #3  
Old 01-28-2013, 08:08 AM
DougDePew DougDePew is offline
Banned
 
Join Date: Nov 2012
Location: Bradenton, FL
Posts: 1,000
DougDePew is on a distinguished road
Default

Optispark status?
Reply With Quote Quick reply to this message
  #4  
Old 01-28-2013, 08:13 AM
4DoorSS's Avatar
4DoorSS 4DoorSS is offline
Senior Member
 
Join Date: Nov 2008
Location: Beautiful Chester County, PA
Posts: 4,434
4DoorSS is an unknown quantity at this point
Default

I've heard that hesitation can be a result of a defective EGR. Not sure what removing it would do or if this needs to be programmed out. Maybe something to consider.
__________________
================================================== =============


'95 Caprice SS conversion - Bonny Buckets - 96 Column, Shifter and Console - 3.73 Gear and Herter tune - Z/28 Cluster - Blazer OH Console - Green/Pink bushings - Chromed Impala Wheels - Eibach Springs and Bilstein Shocks - Corvette Engine Dress - the list goes on and still more to do...it never ends.
Reply With Quote Quick reply to this message
  #5  
Old 01-28-2013, 08:42 AM
9c1twiggy 9c1twiggy is offline
Junior Member
 
Join Date: May 2011
Posts: 4
9c1twiggy is on a distinguished road
Default Stumble off the line.

I haven't touched the opti. I'm considering the delteq upgrade. The egr valve is still in place just not the tube.


Sent from AutoGuide.com App
Reply With Quote Quick reply to this message
  #6  
Old 01-28-2013, 08:55 AM
4DoorSS's Avatar
4DoorSS 4DoorSS is offline
Senior Member
 
Join Date: Nov 2008
Location: Beautiful Chester County, PA
Posts: 4,434
4DoorSS is an unknown quantity at this point
Default

Quote:
Originally Posted by 9c1twiggy View Post
. The egr valve is still in place just not the tube.


Sent from AutoGuide.com App
If the tube is removed, I would think the EGR system is inoperative.

Not sure what removn the egr does for you. Did you follow a documented process on removing the EGR tube/setup and how this may affect an otherwise stock lt1. I still have mine installed (z28 egr) with my hooker super comps. Maybe someone who has deleted the EGR will chime in. But don't think you can just remove the tube and have the engine running normally without doing something else.
__________________
================================================== =============


'95 Caprice SS conversion - Bonny Buckets - 96 Column, Shifter and Console - 3.73 Gear and Herter tune - Z/28 Cluster - Blazer OH Console - Green/Pink bushings - Chromed Impala Wheels - Eibach Springs and Bilstein Shocks - Corvette Engine Dress - the list goes on and still more to do...it never ends.
Reply With Quote Quick reply to this message
  #7  
Old 01-28-2013, 12:44 PM
cletus284 cletus284 is offline
Senior Member
 
Join Date: Oct 2004
Location: STL, MO
Posts: 3,612
cletus284 is an unknown quantity at this point
Default

Did you also unhook the EGR vacuum line? Have you had your PCM reprogrammed to eliminate EGR?

If the EGR valve is still functioning, its going to let the engine suck in unmetered air, which will cause issues.

Also, when the PCM, if not reprogrammed, commands the EGR on, it also does several things to compensate for the EGR entering the combustion chamber, including a significant amount of spark advance. This needs to be programmed out.
__________________
2005 Pontiac GTO
Reply With Quote Quick reply to this message
  #8  
Old 01-28-2013, 02:05 PM
SimplyTheBeSS's Avatar
SimplyTheBeSS SimplyTheBeSS is offline
Senior Member
 
Join Date: Aug 2010
Location: St. Louis, MO
Posts: 2,307
SimplyTheBeSS is on a distinguished road
Default

From Qalo's SS Handbook -

Hesitation, stumble, skipping, missing
Probably the most common problem among our cars. Remember hesitation and stumble are more than likely fuel, exhaust, or intake related and skipping and missing are common among ignition and timing problems.

Hesitation and Stumble
EGR Valve and/or Solenoid
Fuel Filter Clogged
Fuel Pump going bad
Fuel sending unit connections melting on fuel pump
Catalytic Converter clogged, glowing red
Idle Air Control Valve
MAF Sensor
Throttle Position Sensor

Skipping and Missing
Heat shield grounding on the plug, remove them.
Bad Spark plug wire
Bad Spark Plug
Optispark going bad
Ignition Coil going bad
Plugs are arching, check at night.
__________________
1994 SS - GRAIL Webmaster, St. Louis, MO
View our Tech/Guide page for everything from your basic oil change to Manual transmission swaps!

Reply With Quote Quick reply to this message
  #9  
Old 01-28-2013, 02:07 PM
SimplyTheBeSS's Avatar
SimplyTheBeSS SimplyTheBeSS is offline
Senior Member
 
Join Date: Aug 2010
Location: St. Louis, MO
Posts: 2,307
SimplyTheBeSS is on a distinguished road
Default

Quote:
Originally Posted by cletus284 View Post
Did you also unhook the EGR vacuum line? Have you had your PCM reprogrammed to eliminate EGR?

If the EGR valve is still functioning, its going to let the engine suck in unmetered air, which will cause issues.

Also, when the PCM, if not reprogrammed, commands the EGR on, it also does several things to compensate for the EGR entering the combustion chamber, including a significant amount of spark advance. This needs to be programmed out.
I agree with this. Most of the time people have stumbles, it is because additional air until the motor which is not being anticipated. Make sure everything is tight and get your air pump and EGR programmed out.
__________________
1994 SS - GRAIL Webmaster, St. Louis, MO
View our Tech/Guide page for everything from your basic oil change to Manual transmission swaps!

Reply With Quote Quick reply to this message
  #10  
Old 01-28-2013, 06:38 PM
9c1twiggy 9c1twiggy is offline
Junior Member
 
Join Date: May 2011
Posts: 4
9c1twiggy is on a distinguished road
Default Stumble off the line.

I think I'm just going to put the egr tube on for now. Hoping to build a 383 soon. Then ill get all tge programming done at once.


Sent from AutoGuide.com App
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 Chevy Impala SS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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
Display Modes

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

Forum Jump


All times are GMT -5. The time now is 12:45 AM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
(c) 2007-2014 Impala SS Forum