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Engine Miss at low idle only

Discussion in 'Technical Chat' started by dgilling, Jan 27, 2014.

  1. Jan 27, 2014 at 9:52 PM
    #1
    dgilling

    dgilling [OP] New Member

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    3" AAL in Rear, Moog coil springs that lifted the front unintentional 3", Bilstien 4500 shocks
    My truck is basically all stock except I have the deck plate mod and a K&N drop in filter. When my truck is warmed up, I stop at a light, and the engine reaches it's lowest idle speed, there is a weird feeling. My dad called it a miss. the engine will just kind of shake and the rpm needle will move ever so slightly. I don't really know how else to explain it. It happens randomly and I don't really know what causes it to happen more or less. It might happen 2 or 3 times when I'm stopped at a light. The truck runs perfectly normal at speeds. I guess it seems underpowered going up a steep hill but I always figured that was normal for the small truck (kind of bogs down). Anyone have any thoughts? seems like it could be just about anything. Milage is typical ~17MPG.

    2001 V6 double cab
    Plugs are fairly new, 30k miles maybe
    drained gas and put in higher octane gas
    Cleaned Filter (still need to clean MAF, but I did at last interval)
     
  2. Jan 27, 2014 at 9:57 PM
    #2
    Rich91710

    Rich91710 Well-Known Member

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    Cleaning the MAF might help (especially with the K&N, it might be contaminated), but my '08 will "hiccup" every now and then. Not often.
    Could also be your PCV valve.
     
  3. Jan 27, 2014 at 10:00 PM
    #3
    Jetlander

    Jetlander Just trying to measure up...

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    Yes… Change all of the spark plugs. It sounds like you have a bad one. That would be the easiest potential fix. Or you could just pull them all out and inspect/clean and put back in, but if you are going to go through the trouble of pulling them you might as well just change them out. Just my 2 cents…

    However, it could be something different altogether. Is it throwing a code?
     
  4. Jan 27, 2014 at 10:32 PM
    #4
    dgilling

    dgilling [OP] New Member

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    It's not throwing a code.

    I question if it could be the spark plugs. if it was, wouldn't I feel it more when I push on the gas?

    I did think about the PCV valve, that seems like an easy one to check and super cheap. My truck has 175k on it and I know it hasn't been replaced for 80k miles since I've owned it.
     
  5. Jan 27, 2014 at 10:49 PM
    #5
    Jetlander

    Jetlander Just trying to measure up...

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    Definitely something to look at. Start cheap and hope for the best!
     
  6. Jan 28, 2014 at 7:34 PM
    #6
    dgilling

    dgilling [OP] New Member

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    I cleaned the MAF, it was pretty clean anyways. I pulled the PCV valve and checked the vacuum. The vacuum seemed strong with and without the valve and when I shook it, I could hear a rattle as expected. I replaced it anyways since a new one was only $4. Both didn't help. I did find a vacuum hose disconnected but it also didn't solve my issue. I guess next would be plugs but I just can't see how it could be those.
     
  7. Jan 28, 2014 at 7:37 PM
    #7
    Jetlander

    Jetlander Just trying to measure up...

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    You'd be shocked. Give them a try.

    I had a plug with a small crack in the insulator and it gave me all kinds of engine roughness. Took me forever to find the problem, but when I finally did narrow it down I changed the plugs and the problems all went away.
     
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