2006 Chevy Colorado, rough idle when cold

Greg Bernett

• 2993 Answers
• Posted on Sep 03, 2009

SOURCE: how do i change out the knock sensor on a 2006 chevy colorado

You didn't list your engine size so please pick the applicable to your motor size:

Removal & Installation 2.8L & 2.9L Engines To Remove:

1. Lift the vehicle high enough to gain access to the knock sensor (KS) through the left front wheelhouse.
2. Remove the left front wheel and wheelhouse liner.

1. Disconnect the knock sensor (KS) connector.
2. Detach the knock sensor (KS) from the engine block.

1. Attach the knock sensor (KS) to the engine block.
   • Tighten the bolt to 18 ft lbs (25 Nm).
2. Connect the knock sensor (KS) connector.
3. Install the left front wheelhouse liner and wheel.
4. Fully lower the vehicle.

SOURCE: when cold, it idles rough, revs high then low! After warmed up it runs fine

if it runs high when you first start it then mellows out,, theirs no problem , all of our chevys do that.... but if its sputtering or you hear a quiet popping noise check spark plugs

SOURCE: Rough idle

I had the same exact problem on my 2004 Colorado (3.5L). Cleaned the MAF sensor (with MAF sensor cleaner) and throttle body/plate - cleared it right up.

SOURCE: 1994 GMC Jimmy engine runs rough when cold; smooths out when warm

you need to have the codes checked to know what direction to start repairs,Autozone does this for free

SOURCE: idles rough after engine is warm

check ALL vacuum lines for cracks/holes and replace as nesissary