Jump to content
  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

Recommended Posts

So I have a 2106 3.6 Colorado. She's been flawless for 65,000 miles.  Now I have two issues that I hope are related. With the absence of codes I'm looking for anyone who may have had a similar experience.  After refueling when the tank is real low (reserve light on) she cold cranks for several ignition switch cycles before starting.  This ECM has not thrown a code to date. No CEL. This only happens after refueling when the tank was really low. Kinda scary 500 miles from home. Maybe a stuck evap solenoid?  About the same time this started, I started to get a low idle stumble after running at interstate speed.  The low idle stumble is also intermittent.  Again no codes.  Was just bragging to a Ford guy about how reliable my Colorado and my Duramax have been, then this!  Anyone have anything on this?

Link to post
Share on other sites
  • 10 months later...

Hey, one year later and I find this!

My truck has the low rpm stumble too. I've been chasing EVAP issues. To date I've changed spark plugs, MAP and MAF sensors, O2 sensors (position 1 on both sides), the gas cap, and the solenoid in the EVAP canister. My issues started at 95k and have been lingering and I'm nearing 120k now. I have a 2016 V6.

For codes I was getting the code for a lean condition on bank 1, but that stopped after the MAF, MAP, and O2 sensors. The gas cap stopped the Tighten Gas Cap message, but now I'm getting an occasional P0455 code.



Have you fixed your truck? Did you ever solve the rpm stumble? What have you changed or checked?

Sent from my SM-G965U using Tapatalk

Link to post
Share on other sites
Hey, one year later and I find this!

My truck has the low rpm stumble too. I've been chasing EVAP issues. To date I've changed spark plugs, MAP and MAF sensors, O2 sensors (position 1 on both sides), the gas cap, and the solenoid in the EVAP canister. My issues started at 95k and have been lingering and I'm nearing 120k now. I have a 2016 V6.

For codes I was getting the code for a lean condition on bank 1, but that stopped after the MAF, MAP, and O2 sensors. The gas cap stopped the Tighten Gas Cap message, but now I'm getting an occasional P0455 code.



Have you fixed your truck? Did you ever solve the rpm stumble? What have you changed or checked?

Sent from my SM-G965U using Tapatalk



You need a purge valve. Highly common.

I hope this helps

-GM Technician


Sent from my iPhone using Tapatalk
Link to post
Share on other sites

I've changed the one on the intake:
https://www.rockauto.com/en/catalog/chevrolet,2016,colorado,3.6l+v6,3315153,exhaust+&+emission,vapor+canister+purge+valve+/+solenoid,4936

As well as the vent solenoid on the vapor canister:
https://www.rockauto.com/en/catalog/chevrolet,2016,colorado,3.6l+v6,3315153,exhaust+&+emission,vapor+canister+vent+valve+/+solenoid,16992


I forgot to mention I've changed it already. I think I'm going to have to smoke the system to find the leak.

Sent from my SM-G965U using Tapatalk

Link to post
Share on other sites
  • 2 months later...

No help, but when I was young and owned nothing but garbage, I got stuck at many a gas station.

 

This taught me a valuable lesson:  I never ever shut off my vehicle when refueling. 

 

Yeah, you're not supposed to, but I've never been stuck again.

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Similar Content

    • By OldDirtySpartan
      Hi all,
       
      Long time lurker who finally created an account. Y'all have been a wealth of info and I really appreciate it.
       
      I have a 2001 Tahoe LT Autoride with the 5.3. My father-in-law bought it new and I bought it from him when he upgraded to a 2019 Tahoe Premier. I've been going through the Tahoe since buying it from him. It was always maintained at the dealer and serviced at every interval.
      The issue I am having now is a hard start when cold. It takes at least 2 cranks to get it started in the morning or after a long period of not driving.
      I have searched the forums and found some help but no threads with results. Here is what I have done so far to remedy the issue.
      -New plugs
      -New fuel filter
      -New fuel pump
      -Techron in tank (one bottle so far)
      I have a new fuel pressure regulator coming and will swap that next but the telltale signs of failure aren't there (gas leaking through vacuum line).
       
      The truck had one other issue that has since been fixed. It would overheat (on the gauge) on hot days mainly at low speeds and belch coolant when turned off. I ended up replacing the fan clutch, coolant temp sensor, expansion tank, thermostat, and expansion tank cap.
       
      Any advice would be hugely appreciated!
       
      Thanks all!
    • By Steven_R
      1997 5.7 Vortec intermittent slow start revisited.
       
      Short version:
       
      I have a 1997 Express with a 5.7 Vortec and the CSFI system. It has 130k miles.
      It is hard to start after sitting. If I pulse each of the fuel injectors with an injector tester then it starts right up. Problem description is mostly in next post. The test procedure that makes it start is in the third post.
       
    • By Angler21
      Please help!!   2008 GMC Sierra. 4.8.  Replaced fuel pump and FSM last year. Replaced evap solinoid last week.  Truck doednt want to start.  Turns over on first try. Then starts on second try.   Could it be a fuel sensor on fuel rail? 
    • By Angler21
      Please help!!   2008 GMC Sierra. 4.8.  Replaced fuel pump and FSM last year. Replaced evap solinoid last week.  Truck doednt want to start.  Turns over on first try. Then starts on second try.   Could it be a fuel sensor on fuel rail? 
    • By nimrodtoo
      My 2011 Sierra, 169K miles old, just started to stumble on cold starts about 2 weeks ago. Today I got the P0175 code. There's plenty of troubleshooting to do for that code and I'll start on it asap (it's cold in MI). This is the first issue I've had with the motor ever and am wondering if one event could be causing this.  About 5 weeks ago I inadvertently filled up with 93 octane. That was the first time in 479 fuel fill ups that I've deviated from 87 octane. The motor has always started on the first turn whether with key or remote start since new. But in the past month it takes a couple of turns to start up and occasionally stumbles once before smoothing out. There might be a slight miss at idle, but driveability is still good and no lack of power. The P0175 today was the first SES code to come on. It's got a K&N airfilter since 1k miles and the only other change has been plugs and wires at 160K.
       Thoughts? Help?
       
      Thanks,
       Mike
  • Recently Browsing   0 members

    No registered users viewing this page.

  • Forum Statistics

    230,970
    Total Topics
    2,466,037
    Total Posts
  • Member Statistics

    231,353
    Total Members
    8,960
    Most Online
    PJLiberty
    Newest Member
    PJLiberty
    Joined
  • Who's Online   61 Members, 0 Anonymous, 2,770 Guests (See full list)



×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.