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Car shudders at idle

Discussion in 'Care & Maintenance' started by Hummer, Feb 15, 2010.

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    Hummer Well-Known Member

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    Car shudders at idle

    Hey guys, I noticed about a week or two ago that when ever I stop at a red light and my car is idling it starts to shudder, not aggressively or violent, but very quiet and barely noticeable, almost like its gonna die or something, it happens every so 15-30 seconds. Also noticed exhaust pops, Car drives fine, maybe a little loss of power? But not too noticeable. I was thinking it could possibly be dirty oxygen sensor, exhaust leak, fuel injector?
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    MacktasticSlick TRD whore with 36,000 posts, bitch

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    My buddy with the tempo that has the alignment issue that I mentioned a while back has this same problem too... Nobody can figure it out.
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    SaberJ2X Lurk MOAR

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    lol here too
    mechanic says it's probably the idle air passage clogged with shit I dropped enough seafoam in that passage to drown it... turned on the motor and revved it... shiny clean... I just hope it did something lol
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    bennyboi9 Well-Known Member

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    uhmmm, maybe its not enough fuel is being injected in? my car also does this. Its just that the car idles at a really low revs. nothing serious i dont think =]
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    darkgamer1912 Member

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    does it only do it when u first start it and start to drive cuz mine does that revs drop to low and seems like its gonna stall out. idk about the engine popping though that might be something else is ur CEL on if not i would maybe go get it scanned.
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    MstwntdFlip Well-Known Member

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    THIS is what has ben y problem for so long. but now it isnt as bad but my CEL is still on
    putting ot the code p0172 i unno if i should replace the 02 sensors or what not
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    GSE21tuner Formerly rollatuner110. Representing AZLexus.club

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    Check all your lines to the brake booster and the brake booster itself. Also check the diaphragm. Proceed to check all the rest of your vacuum lines following the schematic taped under the hood. I remember diagnosing this same problem when I was working for a mechanic shop.
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    MacktasticSlick TRD whore with 36,000 posts, bitch

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    Question from a relative car noob. How does anything involving the brakes affect how the car idles?
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    GSE21tuner Formerly rollatuner110. Representing AZLexus.club

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    The brake booster uses a vacuum to assist in braking which is supplied by the motor. To simplify things, if you don't have the proper vacuum going to the brake booster, the engine won't run properly either. It will stutter and run unevenly when the brake booster is engaged(at a stop).
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    MacktasticSlick TRD whore with 36,000 posts, bitch

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    Fast response FTW. That makes sense, even if I don't know exactly how those work lol.
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    Hummer Well-Known Member

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    Im pretty sure the car does it in park too, even after the car is warmed up, I know because when I was pulled over the other night I was in park and me and the officer both heard the back fire lol.
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    MacktasticSlick TRD whore with 36,000 posts, bitch

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    Ok now I feel dumb lol. This whole time I was picturing it while you were warming up the car, which is why I was confused about why your brakes would be an issue here. But yes, when you're like at a red light, you're using your brakes and the car is idling. I get it now. facepalm.
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    KrypticKarma ~2001 Corrizm~

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    Did you try cleaning the mass airflow sensor?
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    Hummer Well-Known Member

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    99's dont have MAFs, member I did a front end conversion.
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    darkgamer1912 Member

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    check ur plugs maybe? have u changed them or who ever last had the car did they tell u when they changed them. cuz i had a problem with my plugs would cause miss fires
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    GSE21tuner Formerly rollatuner110. Representing AZLexus.club

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    It sounds like dirty plugs here as well. Check everything that has to do with ignition.
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    Hummer Well-Known Member

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    Will do, next time me and my buddy will do a sweep through and check it out.

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