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Old 08-10-2010, 10:36 AM   #1
euphanom
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Default Low Idle, Sometimes Stalls

98 Civic d16y7.

Just finally figured out why my car wouldn't start, and now that I got it starting again, it's idling really low/choppy. Could this be a clogged PCV valve? Or maybe a failing IACV? The air filter is clean and it accelerates normally.

The tach will rest at about 150rpms (yes, one hundred and fifty) when coming to a stop, then it will bump itself up to about 500 and smooth out. Sometimes it stalls, sometimes it doesn't. When it does stall, it fires right back up, and idles normally, until I blip the throttle and then it starts getting lumpy again.

Any ideas?
Also, how would I get the ECM? ECU? to re-learn the idle?

Thanks
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Old 08-10-2010, 10:49 AM   #2
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Default Re: Low Idle, Sometimes Stalls

lol yeah i am wondering the same thing, mine does it too but i always figured it was from my huge injectors that i really don't need
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Old 08-10-2010, 11:29 AM   #3
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Default Re: Low Idle, Sometimes Stalls

Mine does that too. It's wierd because if I turn the AC on it will idle fine. I hope you figure it out because alot of people I know have this very same problem.
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Old 08-10-2010, 11:31 AM   #4
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Default Re: Low Idle, Sometimes Stalls

diddo on thsi problem
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Old 08-10-2010, 12:13 PM   #5
RonJ@HT
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Default Re: Low Idle, Sometimes Stalls

Try cleaning the IACV. Any CEL codes? How old are the plugs, wires, cap, and rotor?
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Old 08-10-2010, 12:46 PM   #6
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Default Re: Low Idle, Sometimes Stalls

i know mine does it when i have the heater on full blast and headlights on sometimes but not all the time. doesnt bug me much because it doesnt do it all the time just once in a blue moon. i dont have any cels either. it only happens when im coming to a stop sometimes. im turbo so i have bigger injectors as well.
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Old 08-10-2010, 01:44 PM   #7
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Default Re: Low Idle, Sometimes Stalls

Quote:
Originally Posted by RonJ@HT View Post
Try cleaning the IACV. Any CEL codes? How old are the plugs, wires, cap, and rotor?
Not sure how old the plugs/wires/cap/rotor is, the only CEL code it's ever spit out is P0420. Which is probably my bad cat, or an o2 sensor, or both... I'm really hoping that I can get away with some aftermarket part instead of buying a brand new ultra expensive cat converter...
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Old 08-10-2010, 01:56 PM   #8
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Default Re: Low Idle, Sometimes Stalls

Most likely the idle control valve. The Girl friends sol does the same. It needs a good cleaning out!
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