2004 Colorado rough idle - Chevy Colorado & GMC Canyon

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Old 12-21-2010, 03:50 PM   #1 (permalink)
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Default 2004 Colorado rough idle

I have a 2004 5 cyl Colorado that starts and run fine but after short warm up perdiod when I come to a stop the idle drops down and is rough for a few seconds then comes back up and is fine. Once in a while when the idle drops it feels like it's going to die but doesn't, pops back up to normal idle and is fine, anybody out there with suggestions? I did see a service notice a long time ago but was not a recall and referenced the potential for the engine to die on quick stops, related possibly? A few things I've already found is the throttle actuator assembly or update PCM.
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Old 12-21-2010, 04:03 PM   #2 (permalink)
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Default Re: 2004 Colorado rough idle

I would have the pcm updated. When I had mine replaced there were over 170 updates. Also, I cured that very same problem when I had the truck tuned the first time by Canyon08Z71.

That should solve the problem.
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Old 12-21-2010, 04:07 PM   #3 (permalink)
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Default Re: 2004 Colorado rough idle

Your gas filter should be replaced every 30k miles and the throttle body should be cleaned on around the same mileage, or as needed.
Both are part of the normal maintenance routine for these trucks.

Good Luck...

Joe
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Old 12-21-2010, 04:11 PM   #4 (permalink)
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Default Re: 2004 Colorado rough idle

Quote:
Originally Posted by Hawkeye
Your gas filter should be replaced every 30k miles and the throttle body should be cleaned on around the same mileage, or as needed.
Both are part of the normal maintenance routine for these trucks.

Good Luck...

Joe
Thanks Joe :D I always forget the simple maintenance in posts like the one I made.
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Old 12-21-2010, 04:14 PM   #5 (permalink)
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Default Re: 2004 Colorado rough idle

Thanks for both the tips, will replace fuel filter ASAP as it has quick disconnects and is an easy replacement. Is the dealer the only place to get PCM updates?
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Old 12-21-2010, 04:55 PM   #6 (permalink)
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Default Re: 2004 Colorado rough idle

Quote:
Originally Posted by jmeyer22
Thanks for both the tips, will replace fuel filter ASAP as it has quick disconnects and is an easy replacement. Is the dealer the only place to get PCM updates?
:( Sorry to say yes. What you tell them is you found out that GM has updates for your pcm. The service manager will look it up in the system and see you are correct. Then tell the service manager you would like to get your pcm updated. It should cost no more than $150.00 to do it.
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Old 12-28-2010, 01:04 PM   #7 (permalink)
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Default Re: 2004 Colorado rough idle

Depending on your mileage, you should think about changing the plugs. My 2005 started having rough idle last year, so I did the normal maintenace and replaced the plugs -- they were nasty at 87k miles.
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Old 01-04-2011, 03:29 PM   #8 (permalink)
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Default Re: 2004 Colorado rough idle

Based on the replies I have received sounds like a good maintenance overhaul is due, plugs, filters etc.

Thanks
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Old 01-04-2011, 04:39 PM   #9 (permalink)
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Default Re: 2004 Colorado rough idle

Quote:
Originally Posted by jmeyer22
Based on the replies I have received sounds like a good maintenance overhaul is due, plugs, filters etc.

Thanks
That would be a good place to start. And Your .
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Old 01-05-2011, 11:09 PM   #10 (permalink)
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Default Re: 2004 Colorado rough idle

clean your throttle body. i have a 04 5cyl it had a rough idle and it would cut off when i came to a stop. take it to a shop and tell them clean the throttle body i had mine cleaned last week and it made a big difference.
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