The idle in my 09 is kind of rough. Basically you can feel the idle in the whole car when just sitting there versus in my 06 you couldn't even tell it was running unless you listened for the engine. The 06 had 40k on it and the 09 has 15k. I have read some people saying the idle could be rough if there is a boost leak? Is that true? If so would there be any other negative symptoms?

 

mine does it to...and if u give it the slightest gas it goes away

 

yeah, is it just an 09 thing?

 

mine idles about the same as my base did. at least not like the foci i had been driving for 2 weeks

 

mmmm if u bought the car used check if it has a tranny mount upgrade...or motor mount... that would couse it to "feel it iddeling rought"... does it shake a little?

 

SC vs. TC

FI vs. DI

seems like an apples and oranges comparison... they're just not going to feel the same

 

Mine idles rough occasionally as well. Is this a recall?

 

I'm also noticing you guys' locations..... All that metal in cold weather is more rigid and you will notice the vibes more..... the rubber in the mounts are stiffer as well.

 

i have a 09 also! it does the same thing it has been ever since i bought it. i always let it idle down or wait for my fuel pressure get down to 465-675!

 

i let mine warm up at least 10 min be4 every drive.....mine also sounds weird in a cold start, like lil backfires, and all different tones and also wit the vibration....im goin to make a vid c what u guys think

 

hows the car did u get the damage fixed?!?

 

This is the main factor I believe.

 

My 09 never idled rough until i put the catless dp on it. with a slight touch of the throttle it goes away. My rotated mounts did not cause it to idle rough or never even felt the slightest vib after install.

direct injection does not contribute to the vibration/ rough idle IMO.

 

i noticed that in your signature u listed "spare tire" as a mod lol how much hp did u get from it?

 

my 06 lsj i couldnt tell the car was on, the 10 lnf vibes alot in comparison

 

My 09 does idle a bit ragged for the first few minutes when I start it in the cold - otherwise it settles in and purrs; very quiet. Its currently bone stock, though! Many of the LNF mods will cause roughness, as will as intake leaks of one sort or another. Leaks pre 'charger and past MAF will cause problems - it means you're sucking un-read air. CAI's can also cause turbulence and read problems.

And the DI 2.0 should be smoother, considering you have the added control of pulse timing, not just pulse width, which is a jump up from standard FI.

 

think i lost some do to extra weight. should of came with tire inflation kit lol.

 

hahaha

 

yeah thats what mine does...ohh well tho...what pisses me off more is the loud/sweaky struts or shocks

 

yes espcially in the winter..........**** sounds horrible

 

i have developed a rattle in the steering column that is absolutely maddening any bumps or gravel roads are to be avoided it drives me effin crazy.

 

I think that's with any Cobalt unfortunately.

 

From the complaints on the HHR:

Document ID# 1897103 2007 Chevrolet HHR Subject: Steering Column Rattle or Knocking Noise at Low Speeds (Diagnosis and Replace Steering Column, If Necessary) #07-02-35-004 - (02/02/2007) Models: 2005-2007 Chevrolet Cobalt 2006-2007 Chevrolet HHR 2005-2006 Pontiac Pursuit (Canada Only) 2007 Pontiac G5 Condition Some customers may comment on a rattle or knocking noise that is heard in the front of the vehicle while driving at low speeds (5-15 mph or 8-24 km/h). This condition may be more noticeable while making a slow turn, or on a loose/rough surface. This condition can be duplicated by the technician using the following procedure: 1. On a rough or loose surface (i.e., gravel parking lot), make a sweeping turn (either direction) at 5-15 mph (8-24 km/h) to load the steering column, I-shaft and steering rack/gear mechanisms (The testing on a rough or loose surface will allow the wheels to oscillate slightly and will make the rattle/knocking noise more evident and repeatable). 2. Release the steering wheel, while making the turn, to take load off of steering components. This should initiate the rattle/shudder noise, which is generated by backlash in the steering assembly as it is in a no load float condition. Object Number: 1858410 Size: SH Click here for detailed picture of above image. 3. Remove the 60 amp EPS fuse (1) in the underhood fuse block. 4. Test the vehicle as in Step 1. Since the EPS motor is no longer powered, only the I-shaft and steering gear/rack will be loaded as you make the turn. If you hear the rattle/knocking noise during the turn, then the noise is being generated by the backlash within the steering column (assist motor gear mechanism). 5. Replace the 60 amp EPS fuse and repeat Steps 1 & 2 to verify that the rattle/knocking noise disappears when turning (loading steering mechanism) and can only be heard when releasing the steering wheel. Correction If the steering column is identified as the source of the rattle/knocking noise in the above test, then replace the steering column. Important: The noise in the steering column is generated from the metal to plastic gear backlash of the assist motor mechanism and will have a different sound than that from the steering gear. If the customer comments that they still hear a noise, it may be a different sound from either the I-shaft or the steering rack. If the steering column is not identified as the source of the rattle/knocking in the above test, refer to Corporate Bulletin Number 05-02-32-005C. Parts Information Part Number Description 15914408 Kit, Steering Column (Cobalt, G5, Pursuit) 15806195 Kit, Steering Column (HHR) Warranty Information Labor Operation Description Labor Time E7680 Column Assembly, Steering -- Replace Use published labor operation time For other repairs, submit the appropriate published labor operation.

cntd.....

cntd.....

Also: Clunk Noise in Steering System at Slow Speeds
Document ID# 1752745 Subject: EI05093 - Clunk Noise in Steering System at Slow Speeds While Turning and/or Driving Over Bumps (Replace Intermediate Shaft) #05-02-32-005C - (01/20/2006) Models: 2005-2006 Chevrolet Cobalt 2006 Chevrolet HHR 2005-2006 Pontiac Pursuit (Canada Only) 2003-2006 Saturn ION This bulletin is being revised to add additional models and parts information. Please discard Corporate Bulletin Number 05-02-32-005B (Section 02 - Steering). Condition Some customers may comment on a clunk type noise coming from the front of the vehicle during a turning maneuver. This condition can also be felt through the steering wheel when the vehicle is stationary and the wheel is rotated from steering stop to steering stop. Typically, the clunk noise will be heard once for every 90° of steering wheel rotation in either direction. This clunk noise may also be noticed during low speed acceleration or deceleration, typically in light turns of the steering wheel. The following are characteristics of this noise: • This noise is very random. • This noise is independent of the steering wheel angle and independent of the bumpiness of the road. • This noise is a low frequency dull one and can be felt in your feet. • This noise can normally be heard from the driver seat. • This noise can be felt upon touching the steering gear from outside of the vehicle. Note that you might also notice a slight scrub-type noise when turning the wheel back and forth. This type of noise is considered normal and repairs will not eliminate it. Cause This condition may be caused by inadequate lubrication of the steering intermediate shaft. Correction DO NOT REPLACE THE STEERING GEAR OR STEERING COLUMN ASSEMBLY. Replace the intermediate shaft. Parts Information Part Number Description Qty 10394225 Shaft, Intermediate Steering (Cobalt/Pursuit) 1 10392744 Shaft, Intermediate Steering (ION) 1 22730246 Shaft, Intermediate Steering (HHR) 1 Warranty Information For vehicles repaired under warranty, use: Labor Operation Description Labor Time E7700 Shaft, Steering Intermediate - Replace Use Published Labor Operation Time

 

My 06 SS/SC idled a lot rougher than my 09 SS/TC ..... weird you guys have had the exact opposite experience . My turbo is noisey at idle but it's smooth as silk sitting in the seat where as you could feel the motor move in my sc from time to time.

 

i dunno. this hasnt been my experience at all. car is much smoother for me in winter. whenever its above 10°C the dash starts to vibrate and when its above 30°C its violent at certain rpms and has actually cracked my guage pod. but below 10°C nothing vibrates at all.