I have a '06 SS/SC and i have a few issues. First when i stop the revs drop to like 200 rpms then up to 1000 then back down and back up and so on. Also when idleing i have and intermident sound from my supercharger sounding like rocks in a tumbler. I also think my cat is failing or has failed. It hesitates alot with some power loss, my gas milage is terrible and it smells like rotten eggs..my exhaust system was replaced about 8 months ago due to a failed cat. Why would they keep going bad? Has anyone else had any of these problems and how did you fix them?

 

idk, but the idling problem cud be a leak in ur vacuum/intake area. i had one, and it idled weird n then wud stall. maybe u have a bad screw(idk what u wud call it) in the sc and that cud b the clunking? how old is ur car? take it to the dealer and b like Bob The Builder, and ask them "can U fix it?" n they shud say "Yes we can!" lol...idk im tired. goodnight. but the cat problem...idk. maybe just 2 bad cats? the smell is more than deff ur cat though.

 

The cat is definatly bad again. What kinda mods do you have if any?

 

moved to problems and service

 

Maybe theres a REAL cat...stuck...in your cat? Have you been feeding the Eaton kittens lately? Just a thought for the terrible smell.

 

I have a fujita CAI and that is the only mod i have

 

Yea, i have had the idling problem, but im not sure where i go wrong

 

I would just bring it back to your dealership since all of that will be covered under warranty.

 

mine does the idle thing from time to time. especially if the ac is on. I usually just give it a quick rev and it seems to straighten it right out.

 

u got a vacuum leak some where. did u or someone put a stage II on it? cuz i had that problem i got my stage II put on and they tore the injector seals. And u deffently got a bad cat again.

 

damn. sounds bad.

 

There is a updated flash for this issue , take it in and have them load the newer calibration .

Document ID# 1854334
2006 Chevrolet Cobalt

Subject: LSJ Fluctuating, Unstable or Incorrect Engine Idle (Reprogram ECM) #06-06-04-039 - (08/10/2006)

Models: 2005-2006 Chevrolet Cobalt SS Supercharged
2004-2006 Saturn ION Redline
with Ecotec� 2.0L I-4 Engine (VIN P -- RPO LSJ)


Condition

Some customers may comment that the engine idle may fluctuate (idle roll) a hundred rpm for several seconds when the engine is started hot or cold. Further diagnostic investigation with a scan tool may not reveal the cause. No other driveability or performance concerns may be reported.
Cause

The most likely cause of this issue may be that the engine calibrations need to be updated to correct the fluctuating engine idle .
Correction

DO NOT replace the throttle body, the ECM or any other parts.

Important:
• Chevrolet Dealers: The ECM calibration is available to dealerships as part of TIS2000 incremental satellite update version 6.5, which was broadcast to dealers on June 12, 2006 or later. For the dealerships that use CDs, they were mailed out June, 2006 or later.
• Saturn Retailers: Before installing the new ECM calibration, make sure the Saturn Service Stall (SSS) version is TIS 6.5 2006 or later.
• While the ignition is OFF, apply the parking brake to disable the daytime running lights (DRLs) prior to starting reprogramming procedures
• The technician must select the "Reprogram" option in order to reprogram the ECM.

Reprogram the ECM with the latest calibration. This calibration, or any that follow, is designed to address this fluctuating engine idle concern. Refer to Service Programming System (SPS) in SI for reprogramming procedures. As always, make sure your Tech 2® is updated with the latest software version
Warranty Information

For vehicles repaired under warranty, use:

Labor Operation


Description


Labor Time

J6354


Module, Powertrain Control - Engine Reprogramming with SPS


Use Published Labor Operation Time


GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
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Document ID# 1854334
2006 Chevrolet Cobalt

 

Mine also has the idling problem, and sometimes when its idling it will start to make a squelling noise coming from one of the pulleys i think. I know its not the belt.