Need everyones help ~ Idling Issues

Discussion in 'GM Powertrain' started by MTM, Sep 11, 2012.

  1. MTM

    MTM New Member

    Alright I posted this questions a few weeks ago and got some feedback but need help. I an still having idle issues. Makes no sense to me when the hood is open it idles perfect tgen you close the hood it wants to die. Never has died all the way but it wants to. Other than this have no other issues. Need any thoughts possible
  2. Skippy

    Skippy New Member

    Sounds like your engine compartment isn't breathing. If your air intake is drawing air from the compartment, and the hood is closed (and seals tight), you'll restrict air intake.

    Check to see if the hole in your air filter box is restricted in any way, and make sure the air path to the intake box (usually at a fender or something) hasn't been filled up with debris or otherwise.

    One last thing... are your fans working?

    -Skippy
    1 person likes this.
  3. tbplus10

    tbplus10 Super Moderator Staff Member

    I understand where Skippy's coming from but I think there should be enough air coming from underneath the truck to allow it to run, I mean unless you have a sealed engine bay this shouldnt be a problem.
    But on a longshot here have you run the truck at night with no light sources? Maybe lower the hood partially and watch for arcing coming from the ignition components? Maybe somethings not sealed properly or incorrectly grounding on the hood via arcing?
  4. MTM

    MTM New Member

    Here's my recent upgrades persay. I have a cold air...spectre. I was having power issues traced it to the MAF sensor so replaced that then I went ahead and changed the radiator while I had all that apart. Seemed to run fine but now I'm just lost for thoughts. Hope this helps
  5. SurrealOne

    SurrealOne Former Member

    Loose wire(s) into the MAF? Wires into MAF positioned in such a way that when the hood comes down it makes contact with them (part time or completely) and affects its operation? Hood coming down on a wire causing a short, somewhere?
    1 person likes this.
  6. tbplus10

    tbplus10 Super Moderator Staff Member

    Is the Spectre cold air box a closed style system, i.e. uses the hood to seal the box from the engine compartment while a supply tube draws air from outside the truck?
    If so then like Skippy posted this could be your problem and you need to check the inlet tube to the box for restrictions
  7. dsfloyd

    dsfloyd New Member


    this is where I what I was originally thinking.



    These make sense too.
  8. MTM

    MTM New Member

    It's open it draws air from the engine bay
    The fan clutch looks fine.
  9. dpeter

    dpeter New Member

    Is there a vacume hose being displaced as the hood is closed causing it to open up and leak? Does it drive OK on the road?
  10. MTM

    MTM New Member

    No nothing is in the way at all. And yea that's what is so crazy it runs awesome. Give you an idea I can go to pass someone and it downshifts and tries to get sideways and I'm on 33's. Fuel mileage is normal everything seems perfect but can't figure this out at all
  11. RayVoy

    RayVoy Active Member

    It does not draw air from under the hood. It is a COLD AIR INTAKE. it and the original intake draws air from a hole in the radiator support. A hole that is behind the right headlight.

    I don't know if you have/had a restriction, or not, but I suggested that you look for an restriction in the old thread, http://www.gmtruckclub.com/forum/showthread.php/97520-Crazy-Idle-Issues#axzz26DAzginx you blew me off and opened a second thread. And, I see, with a little searching, that this is thread #3 http://www.gmtruckclub.com/forum/showthread.php/97165-Problems-at-Idle#axzz26DAzginx


    You changed the radiator and now it appears to be ok, you probably removed whatever was restricting the air flow when you changed the radiator.

    If someone else changed the radiator, you may never know what was causing the problem; but, at least, you could have taken a look to see if there was an restriction, instead of arguing with people trying to help you.
  12. MTM

    MTM New Member

    Wasn't blowing you off at all. I changed the radiator and MAF sensor at the same time. Just don't see what could be blocking it there's nothing around my intake

    100MEDIA$IMAG0099.jpg
  13. RayVoy

    RayVoy Active Member

    Ok, explaining that and providing this pic might have helped you a couple of threads ago.

    That does not look to be installed in the correct location. The idea of a cold air intake is to get air that is not inside the engine compartment.
    The opening of the CIA needs to face a hole in the radiator support. When you close the hood, you are closing off the air intake.

    Look where the old intake was mounted, there should be a hole in the radiator support. You need to move your CIA to that hole, so the intake can breathe
  14. MTM

    MTM New Member

    Nope that's how it's supposed to be you can look on all these old bodies that's how they mount. The factory one with the closed in box used to suck from the inner fender. Sorry but you can't tell me it doesn't breath because you can hear the large amount of air getting sucked in.
  15. Conlan Rose

    Conlan Rose Super Moderator

    Still you need to check if the stock intake is blocked in anyway because the CAI if pulling air from there as well and at idle the fan doesn't draw as much air but at speed it does. That's the point [MENTION=54249]RayVoy[/MENTION] is trying to make. the factory air intake tube in the fender that leads to the front of the truck behind the right park light.
    Here's a picture:
    air-intake-system-tc0303501.png
  16. MTM

    MTM New Member

    Thanks for all the input. I figured it out the dealership put the MAF sensor in backwards I pulled it all apart just now and flipped it over and it was backwards
  17. dsfloyd

    dsfloyd New Member

    that sucks. they even put a direction arrow on those usually. hopefully that fixes it all.
  18. MTM

    MTM New Member

    Yea I would've done it myself but the autoparts store would have taken a week to get in and i needed it that day. Runs perfect now thanks everyone. This forum is a big help
  19. SurrealOne

    SurrealOne Former Member

    At least it was something simple. That's an interesting effect from the MAF sensor being reversed; I'd have expected it to run like crap with the hood open as well as when shut...
  20. MTM

    MTM New Member

    Me to. That's what was so crazy about all this is it ran great and never had a problem with the performance aspect. Like i said above breaking 33's loose wasn't a problem it was just at idle.(Just to note I don't burnout but does walk a little when it down shifts to pass someone)

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