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Thread: Stumbling/rough idle, no CEL.

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    Default Stumbling/rough idle, no CEL.

    Having some issues with my '03 R/T CC.

    Stumbling/rough idle.
    No CEL.
    Stumbles/hesitates on acceleration from idle.
    Data log shows 02 sensor voltage all over the place, air fuel and timing also jumping around trying to keep up.
    Battery voltage seems fine.
    Driving is fine, after it comes off idle, no indications of running rough.
    Power/accel (once of the initial idling stumble) seems fine.

    Thinking it could be an 02 sensor? Truck has 114K and I assume they are all stock. Replace all 4?
    Or could be the IAC? Cleaned it really good 5 months ago with the M1 instal, has been running great since then..

    I've read the upstream 02's feed the air/fuel mix to the PCM, could one or both be bad?
    Any brand of 02 sensors to stay away from?

    Thanks in advance for the advice!
    Last edited by Hatchman; 12-04-2017 at 04:30 PM.
    '03 Stampede Graphite Metallic Dakota R/T CC

    FRP tune, M1 2bbl, HiPoTek 52mm TB, K&N 14" Filter, Headers, Flowmaster duals

  2. #2



    chrgr340's Avatar
    DAKRT56

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    Denso and, I believe, NTK make a good O2 sensor. From what I've heard and read, stay away from Bosch.

    Steve - 1999 Flame Red RC R/T-56
    Comp Cams | F&B | Mopar | Spintech | SCT | Hotchkis


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    BIGROB's Avatar
    I killed Goose

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    If you barely open the throttle and the stumble clears up then its probably the IAC.

    Project Maverick. I feel the need, the need for speed

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    chrgr340's Avatar
    DAKRT56

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    And if you do swap the IAC, make sure you use genuine Mopar parts, not parts store crap. No one has good luck with those.

    Steve - 1999 Flame Red RC R/T-56
    Comp Cams | F&B | Mopar | Spintech | SCT | Hotchkis


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    Quote Originally Posted by chrgr340 View Post
    Denso and, I believe, NTK make a good O2 sensor. From what I've heard and read, stay away from Bosch.
    Rockauto has some good deals on Denso, so will probably get those. Thanks!

    Quote Originally Posted by BIGROB View Post
    If you barely open the throttle and the stumble clears up then its probably the IAC.
    It definitely stumbles when I open the throttle, probably for a few seconds, so sounds like it is not the IAC. Thanks!

    Quote Originally Posted by chrgr340 View Post
    And if you do swap the IAC, make sure you use genuine Mopar parts, not parts store crap. No one has good luck with those.
    Mopar IAC only, got it. Thanks!
    '03 Stampede Graphite Metallic Dakota R/T CC

    FRP tune, M1 2bbl, HiPoTek 52mm TB, K&N 14" Filter, Headers, Flowmaster duals

  6. #6
    BIGROB's Avatar
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    It just needs more cowbell.

    Project Maverick. I feel the need, the need for speed

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    Quote Originally Posted by BIGROB View Post
    It just needs more cowbell.
    "I got a fever! And the only prescription... is more cowbell!"
    '03 Stampede Graphite Metallic Dakota R/T CC

    FRP tune, M1 2bbl, HiPoTek 52mm TB, K&N 14" Filter, Headers, Flowmaster duals

  8. #8

    Hugh Jassole's Avatar
    Shoo Shoo Retarded Flu !!

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    NTK is the stock manufacturer. Get them at Rockauto, they'll even call out the exact stock replacements. No offense to the above posters on other brands, but they are wrong.
    "the vast majority of the people on this website are such tight asses that they could probably squeeze out diamonds - but they'd never spend the money to buy the coal' - Steve F. 2012

    "Don't be obsessed with your desires Danny. The Zen philosopher Basho once wrote, "A flute with no holes is not a flute, and a doughnut with no hole is a Danish" - Ty Webb, 1980

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