Engine Won't Stay Idling?

Discussion in 'General Discussion' started by fe4snake, Aug 2, 2021.

Car Parts
  1. fe4snake

    fe4snake Full Access Member

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    Hi Everyone,

    I just finished doing a whole engine build on my truck: Forged Internals, Heads, Stock Cam, Cold Air Intake, Long Tube Headers, Magnaflow Exhaust, Coils, Spark Plug Cables, NGK Spark Plugs, electric dual fans.

    At first start up, the engine sounded great and no issues with idling. After the engine was broken-in it started to not want to idle and just die. It fires up fine and accelerates fine. I just need to keep my foot on the accelerator to keep the idle up in order from dying on me.

    I've checked for DTC codes and no codes have popped up. Fuel pressure is reading 60 lbs, vacuum gauge reads steady and no leaks.

    Does anyone have any suggestions on how further diagnose this issue?

    Thanks,
     
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  2. oldcolt

    oldcolt Striker Heads and Cam Supporting Member

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    Check to make sure your IAC (Idle Air Control valve) is not gummed up and can move freely. It is not expensive to replace.
     
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  3. fe4snake

    fe4snake Full Access Member

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    The IAC looks fine to me, will order a new one eventhoug there's no DTC.
     
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  4. rottenronnie

    rottenronnie Well-Known Member Supporting Member

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    Disconnect both battery cables and touch them together (as your Stepper-Motor may have forgotten what is going on).
     
    Last edited: Aug 2, 2021
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  5. AMS3

    AMS3 Well-Known Member

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    What in the hell is a Stepper Motor?
     
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  6. rottenronnie

    rottenronnie Well-Known Member Supporting Member

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    The ECU can lose count of adaptive control of the IAC which is controlled in incremental steps.
    The IAC is a Stepper Motor.
    Resetting the ecu with the battery cable "trick" will return it to the tuned baseline.
    Best to ask for an IAC at a Parts Department though, so they don't refer you to a company that sells Escalators. :)
     
    Last edited: Aug 3, 2021
  7. AMS3

    AMS3 Well-Known Member

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    LOL!!! Ronnie, you always manage to make me laugh.
     
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  8. Kiwi SRT10

    Kiwi SRT10 Well-Known Member Supporting Member

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    All these IAC's and ECU's and ABC's EQC OBE sheet I am losin' the plot. All sounds like Swahili to me. Does anyone hear speak English LOL;)
     
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  9. AMS3

    AMS3 Well-Known Member

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    sdfone tm cogenatw :p
     
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  10. Kiwi SRT10

    Kiwi SRT10 Well-Known Member Supporting Member

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    Nice try, keep up the lessons you will have it in no time at all;):D
     
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  11. rottenronnie

    rottenronnie Well-Known Member Supporting Member

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    STP- Mystery goop for engines (didn't really state anything about what it did on the container)
    STD- Generally an unwelcome guest that should be dealt with ASAP and NOT passed around.
    ABS- Makes a strange sound just before you pile into something.
    LSD- Some claim it might make sense of what's going on around us today (but I doubt it).
     
    Last edited: Aug 6, 2021
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  12. Kiwi SRT10

    Kiwi SRT10 Well-Known Member Supporting Member

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    Yeah that's certainly got it sorted. Maybe I can keep up now lol
     
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  13. rottenronnie

    rottenronnie Well-Known Member Supporting Member

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    So glad I could help. ;)
     
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  14. Wifey

    Wifey Well-Known Member Staff Member Super Moderator

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    Ronnie you always amaze me were you just born brilliant or did you have to work at it?
     
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  15. VIPR PWR

    VIPR PWR Full Access Member

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    Lol ,, your going to make it go to his head Wifey .. lol
     
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  16. Wifey

    Wifey Well-Known Member Staff Member Super Moderator

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    I have to bother someone might aw well be Ronnie :eek::p:cool:
     
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  17. rottenronnie

    rottenronnie Well-Known Member Supporting Member

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    Thanks Wifey; my 2005 QC is "Bright" Silver Metallic. That could be where the confusion is coming in.

    Britney Spears was once quoted as saying she'd like to visit overseas places like Canada.
    Even with "Global Warming", I believe Canada and the U.S. are (not yet) separated by water, but: IF WE DON'T STOP BURNING FOSSIL-FUELS IMMEDIATELY, IT COULD HAPPEN!! (Yeah, ok...)

    Anyway, back on track...


    Even the multitaskers (like my SRT-10) with average mileage seem to be in the spotlight, even in overseas places like Canada.

    I'm not sure what is causing so many people to come to their senses and finally appreciate the SRT-10s. Maybe its a side-effect of C-19 vaccines and if that is the case, they truly ARE good for something.

    During the last (two) truck outings, I've had unsolicited high offers on my QC.

    One was from a kid that really should lay off the Red Bull and whatever else was roaring around in his system but the other was from an old guy (my age) that seemed completely legit.

    Some people have amazing vehicle talents that render the original vehicles' mileage irrelevant and once sold, we shouldn't care what happens to them. But I think I still might if I sold mine.
     
    Last edited: Aug 8, 2021
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  18. AMS3

    AMS3 Well-Known Member

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    :D
     
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  19. rottenronnie

    rottenronnie Well-Known Member Supporting Member

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    Did you get it running properly?
    If so- What was causing the problem?
     
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  20. Wifey

    Wifey Well-Known Member Staff Member Super Moderator

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    Maybe he’s still test driving it??? :rolleyes::rolleyes::rolleyes::rolleyes::rolleyes::rolleyes:
     
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