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Thread: Car surges,idle goes very low and almost stalls when coming to a stop.

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    Car surges,idle goes very low and almost stalls when coming to a stop.

    2004 3.0 automatic nsx had timing belt,v/c gasket,oil pan gasket,valve adjustement,drive belts,o2 sensor replaced,cel light came on after repairs,found timing off,corrected car ran perfect for a week and then idle started going very low when coming to a stop. I returned the dealer who performed cleaning of throttle and replaced corroded battery cables complete, I declined the easier repair of replacing the end connectors.
    vehicle again ran awesome until recently when idle drops and almost stalls when coming to a stop and surging at a stop with foot on the brake....any
    ideas of what could be wrong ?

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    Registered User rsevo6's Avatar
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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    Very often this kind behaviour is caused by a vacuum leak.
    I would inspect all the vacuum lines for cracks/tears, not unusual to occur when old dried out lines have been (forcefully) pulled off their connectors for engine work and installed again.
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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    Sounds like a vacuum leak for sure.

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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    +1 on the likely-hood of a vacuum leak.

    Might want to check that throttle body as well to make sure they did a good job of cleaning it(it should look as clean behind the throttle blade as it does in front of it).
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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    Acura dealer is replacing comlete throttle body.

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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    new throtle body installed,felt the difference from the minute i left dealership..

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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    Quote Originally Posted by nsx200416 View Post
    new throtle body installed,felt the difference from the minute i left dealership..
    I have this issue... what was the cost of this?

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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    It's rare that TB's just wear out unless the shaft was worn causing vacumn to seep through, still it's rare. Did they give any indication what the issue was? I would guessed the IAC bad.
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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    My car does this when its time to clean the TB..... when I clean it, its fine for a while but then the issue comes back... not sure what i can do about this as its really annoying...

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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    i had the idle drop issues after my timing belt disaster and it took two or three synch procedures (thats after correcting the timing as well) for the TBA to behave (SOS took care of it, NA2 ODB II related stuff). it is possible that after the service the TBA wasn't metering right but replacement of the unit with corresponding proper install 'coincidentally solved' the problem. has the tech tested the assembly? you might have a good used TB for sale
    Last edited by swerve; 06-09-2011 at 21:29.
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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    Quote Originally Posted by enkrypt3d View Post
    My car does this when its time to clean the TB..... when I clean it, its fine for a while but then the issue comes back... not sure what i can do about this as its really annoying...
    If Im correct, the vapors from the crankcase are recirculated through the TB thus after time gunking it up. You may have an unusual situation on your hands if yours dirtys up rather quickly. I cleaned mine 4 years ago and though I have'nt checked it since, my car idles perfectly...........Knocks on wood!
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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    The surging has been fixed and the low rpm's when coming to a stop has been fixed with new throttle body. The idle will be perfect until car is warmed up then it idles a little rough when in park but when in gear it's perfect, i just said screw it i will live with it..
    as far as how much the throttle body cost ? it was replaced under warranty,I guess they kept the old one..the tech wanted to replace idle control valve ? but it does not come seperate..so they said..i dint care I was not paying for it..I still think It can be better (idle) but i do understand car is not going to idle like a lexus...who wants that anyway lol ! but i think it can be better,car is under warranty for 2 more years,i will drive til next oil change and see how it goes !!!
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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    Quote Originally Posted by nsx200416 View Post
    The surging has been fixed and the low rpm's when coming to a stop has been fixed with new throttle body. The idle will be perfect until car is warmed up then it idles a little rough when in park but when in gear it's perfect, i just said screw it i will live with it..
    as far as how much the throttle body cost ? it was replaced under warranty,I guess they kept the old one..the tech wanted to replace idle control valve ? but it does not come seperate..so they said..i dint care I was not paying for it..I still think It can be better (idle) but i do understand car is not going to idle like a lexus...who wants that anyway lol ! but i think it can be better,car is under warranty for 2 more years,i will drive til next oil change and see how it goes !!!
    canadian grand prix sunday !! Lewis hamilton will take it !!
    thanks what year is your car?

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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    Trapped air bubbles in the coolant will cause idle issues as well.
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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    my car is 2004... i bought a warranty (acura care) before vehicle went out of factory warranty in 2008 it's under warranty til 2013 or 113k miles..i got 60k miles
    a coolant frlush was performed when replacing timing belt..should i have coolant flushed again ?

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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    Honda coolants usually good for 5 years.
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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    For idling issues being possible air pocket or bubble in cooling system should i have coolant flushed again...

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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    Quote Originally Posted by nsx200416 View Post
    For idling issues being possible air pocket or bubble in cooling system should i have coolant flushed again...
    No, just have them re-bleed it. If not done correctly, air can get trapped near the idle sensor and throw readings off.
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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    Is a 2005 throttle body compatible with a 95 TB? They're both drive by wire and OBD II..... thoughts?

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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    I am not sure my friend,I can make a few calls to find out..

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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    I had this issue after switching to the foam/oil Unifilter for better airflow. Inside of the TB became oily/dirty and plugged a couple of critical vacuum passages. Pulled rubber airbox boot off of TB, gently "misted" carb cleaner (heavy spray can damage engine...be careful) into intake at 2500-3000 rpm high idle. Once cleaned, surging/stalling stopped and I went back to stock paper air filter. No problems since...Uni on car shelf in garage...
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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    Quote Originally Posted by Quix-Draw View Post
    I had this issue after switching to the foam/oil Unifilter for better airflow. Inside of the TB became oily/dirty and plugged a couple of critical vacuum passages. Pulled rubber airbox boot off of TB, gently "misted" carb cleaner (heavy spray can damage engine...be careful) into intake at 2500-3000 rpm high idle. Once cleaned, surging/stalling stopped and I went back to stock paper air filter. No problems since...Uni on car shelf in garage...
    I had this issue too and have the paper filter in... it worked for a while but now the idle drop issue is still there...... grrrr

    1995 Midnight Pearl NSX-T #400

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    Re: Car surges,idle goes very low and almost stalls when coming to a stop.

    read my post above about the tb synch.

    on another note- i swap between uni and kn on regular basis with no issues at all.
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