Rough idle

Asked by Oct 20, 2015 at 05:46 PM about the 2012 Chevrolet Colorado LT1 Crew Cab

Question type: Maintenance & Repair

I just bought a used 2012 Chevy
Colorado the inline 4 cylinder LT. The
truck has a rough idle we scanned it
because the CEL has been on for
misfires in cylinder 2. I got it through
a dealer and we have them the truck
the said they switched coils from 3 to
2 and when I picked it up from them
the CEL came back on. I've changed
coils 2 and 3 and all plugs and it still
has a rough idle and CEL

5 Answers

1,625

our engine light flash?? thats a sighn of a misfire a bad coil, or plugs

1 of 1 people found this helpful.
71,605

What did the plug from the misfiring cylinder look like? Was it wet from gasoline? Wet from coolant? Dry and black? Wet and black? - Jim

75,495

No other codes indicating a IAC sensor?

1 of 1 people found this helpful.

Dirty throttle bodies. Usually cleaning them smoothes out the rough idle from what I've been told. I have the V8 model so it's not an issue for me.

I have a 2005 Colorado with the 4 cylinder engine that I've had for 11 years and it's been a great little truck. It has just less than 200K miles on it and in the last year or so the idle at start up and when coming to a stop had gotten worse and worse. I tried a number of things to fix it but nothing worked until I found on the internet about the the dirty throttle body issue. So I took off the throttle body and cleaned it up with throttle body cleaner and a tooth brush, buttoned it back up, torqued to specs, etc. and WOW what a difference! It was like having a brand new motor I shit u not! So if you have a rough idle on a truck with a lot of miles on it and you've tried the obvious things like a tune-up, new fuel filter, and it's still got a rough idle, then clean the throttle body. The difference is nothing less than amazing.

Your Answer

Colorado

Looking for a Used Colorado in your area?

CarGurus has 36,752 nationwide Colorado listings starting at $1,995.

ZIP:

Chevrolet Colorado Experts

  • #1
    Js08016
    Reputation
    290
  • #2
    tropikalpirate
    Reputation
    280
  • #3
    COMETGUY61
    Reputation
    150
View All

Related Models For Sale

Used GMC Canyon
135 Great Deals out of 14,210 listings starting at $1,500
Used Toyota Tacoma
667 Great Deals out of 46,329 listings starting at $2,700
Used Chevrolet Silverado 1500
2,420 Great Deals out of 174,000 listings starting at $699
Used Ford F-150
2,843 Great Deals out of 213,211 listings starting at $1,295
Used Nissan Frontier
388 Great Deals out of 23,963 listings starting at $2,200
Used GMC Sierra 1500
1,143 Great Deals out of 65,557 listings starting at $1,750
Used Ford Ranger
173 Great Deals out of 5,423 listings starting at $1,250
Used Toyota Tundra
599 Great Deals out of 35,468 listings starting at $2,900
Used Ram 1500
1,230 Great Deals out of 116,198 listings starting at $6,200
Used Chevrolet Silverado 2500HD
330 Great Deals out of 30,638 listings starting at $2,499
Used Chevrolet Tahoe
792 Great Deals out of 42,136 listings starting at $1,980
Used Nissan Titan
222 Great Deals out of 19,813 listings starting at $3,800

Used Cars For Sale

2012 Chevrolet Colorado LT1 Crew Cab For Sale
3 Great Deals out of 91 listings starting at $7,980
2010 Chevrolet Colorado LT1 Crew Cab For Sale
3 Great Deals out of 37 listings starting at $10,800

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.