How to fix a Rough Idle on a 04 Chevy Colorado!

How to fix a Rough Idle on a 04 Chevy Colorado!

This is a how to video on how to remove and clean the Mas Airflow Sensor and The Throttle Body which usually cause a rough idle and makes your truck die out on you.
This is not a guaranteed fix but it is a first step diagnosis in resolving your issue.

Over time, carbon buildup can accumulate around the throttle plate, changing it’s “home” position. If the buildup occurs gradually, the PCM “learns” the new home position. But when your battery goes dead or you disconnect it to work on your vehicle, the PCM “forgets” the adapative home position. If you replace the throttle body, the PCM won’t know and will continue to use the adaptive settings as if the carbon buildup is still in place. If you don’t do a relearn procedure, the PCM will “hunt” for a new baseline idle. It will eventually learn it on its own, but it may take over a week of driving, during which time you will experience high and low idle speeds and possibly rough idle.

Here’s the throttle body relearn procedure

1) Start the engine and let it idle in park for 3 minutes. During that period the idle may be higher idle than normal.
2) After 3 minutes, turn the engine off and leave it off for 60- seconds.
3) Start the engine again and let it idle in park for 3 minutes one more time. During these run periods you may see a check engine light. Scan for codes and if you get throttle body related codes, clear them.
4) If the idle speed is still off, drive the vehicle at speeds above 44-mph and operate several acceleration and deceleration cycles. Then repeat step #3 one last time.

The idle should now be normal

ProjectCorona assumes no liability for property damage or injury incurred as a result of any information contained in this video. ProjectCorona recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to the factors beyond the control of ProjectCorona, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ProjectCorona.



HellSpawn85 says:

My 08 Canyon has a light vibration while at idle. Will this help with that?

Jon smith says:

I did this and now my engine light is flashing and I still have throttle problems

Tripped Redd says:

Thanks for the video! I accidentally broke my hose but that was my fault… I have no clue how to replace it either does anyone know anything that will help me?

BigD2856 says:

Thanks for the step by step video. Had the check engine light cleared and now it's running like a new truck.

Mr Penguin says:

As far as the removing of the throttle body, you don't have to. Try the seafoam top engine cleaner and lube.

Imagine A World says:

A pcm update helps too

Mr_ Lucky_17 says:

Will it work too if it rough idles when you only have less quarter of tank filled

Tourettes 17 says:

You don’t need to remove the throttle body. Just clean the throttle valve, it will save you some time.

Jake Mathis says:

Anybody else trying to fix P0106?

Brian Glynn says:

Thanks Dude. I needed a refresher on this. Rough idle issues are now gone!

Timo Kuusela says:

This one is the best of these, as it actually shows the result. I did the same fix years ago to my H3, and now there is need for another cleaning as the surge is back. While the box is off, it is good to check the coil wires, as they can rub against the valve cover and ground blowing the fuse. No OBD-reader can tell what has happened, not even Tech2, as it blows the coil fuse. It took me a day to figure that out… At the same time one can also replace the spark plugs if they have more than 60000 miles on them.

Vernon Salyers says:

hahahhhh…one-hander from the get…hold'n that camera and work'n that wrench like a boss…yeah bruh!

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