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Low idle

Old 22-Sep-2003, 12:54 PM
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Low idle

I ahve a 97 civic cx with 200km and on an occasion i have a low idle and feels like the car is going to die but other times it idles fine. Its not throwing any codes and i was thinking it was a O2 sensor but dont know for sure. Thanks
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Old 22-Sep-2003, 01:10 PM
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o2 throws code on OBD2 cars
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Old 22-Sep-2003, 02:52 PM
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any ideas?
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Old 22-Sep-2003, 02:58 PM
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really hard to say with that kinda mileage... have you pinpointed any specific condition when this happens... ie. it's humid, it's raining, it's cold, it's hot... first thing in the morning, or after a long drive? Anything to help narrow it down...
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Old 22-Sep-2003, 03:44 PM
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my personal opinion is its valve adjustment done wrong when the engine reaches different temperatures the metal expands and contracts so when it warms up it might idle funny but won't ever die my best guess is spend 45 minuites and re doo valve adjustment its free doesn't cost you anything if that doesn't fix it then ??????? who knows but i think that is u r problem ? did a valve adjustment recently ?
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Old 22-Sep-2003, 06:15 PM
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ya but it has done it before and after the adjustment
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Old 22-Sep-2003, 09:18 PM
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is it the b16a ? there is something on the back of the throttle body that needs to be dissassembled and cleaned then prolly
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Old 22-Sep-2003, 10:04 PM
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bump for this guy coz I got the same problem on my C5 swap as well, I have asked so many shops but no one can ever point out what exactly is the problem.
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Old 23-Sep-2003, 12:05 AM
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maybe try cleaning your IAC...maybe its getting a little sluggish?
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Old 23-Sep-2003, 08:09 AM
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What is the IAC?
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Old 23-Sep-2003, 08:30 AM
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idle air control valve, on the back of the throttle body... it could just be gummed up a little, it's pretty common for carbon buildup to restrict the calibrated passage. Most guys just spray t-b cleaner into it while the engine is running... this is not good if you like your engine... if you don't care, it's okay, but change your oil and filter after.
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Old 23-Sep-2003, 10:54 AM
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cool, im gonna try cleaning the iac, thanks
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Old 23-Sep-2003, 04:03 PM
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no shops will point out the problem cuz they all know they can charge you 200 bucks to fix it in 5 minuites
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Old 23-Sep-2003, 09:14 PM
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Originally posted by kwikb16a2
cool, im gonna try cleaning the iac, thanks
Have you fixed your problem yet? Just curious is that really the IAC problem.
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Old 23-Sep-2003, 09:17 PM
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thats the IAC not IVC
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Old 23-Sep-2003, 09:18 PM
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Typo, sorry
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Old 23-Sep-2003, 10:35 PM
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does the car stall out ever? because if it does, then the IAC is most likely broken. if not, then an adjustment (there is a screw located on it that will tweak the rpm of the car idle), or cleaning of the IAC may fix your problem.

i believe your idle should be around 700 rpms.. correct me if i am wrong
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Old 24-Sep-2003, 12:10 AM
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done the adjustment couple times but still, the idling is ok for few minutes then the rev will drop to 600+ for a second and then it revs up back to 780-800. Just like the engine is breathing..... don't know how to explain.
Sometimes I step on the gas to rev it up abit, if I let go of the gas, the rev will drop but will not stay around 780-800 but will drop right down to 600+ then rev back up to 780-800. Asked some shops already but no one can ever point out whats the problem, some said is the electric problem.
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Old 24-Sep-2003, 08:28 AM
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most shops employ crack ***** monkeys... either go to a real shop, or take the problem on yourself.

FIRST OF ALL, you should NEVER touch the idle adjustment screw... unless you have replaced the throttle body with a non-factory unit. The throttelbody is tuned on a flow bench at the factory, so unless you have a flowbench in your bedroom, don't even attempt it.

Secondly, there are a minimal number of sensors that control idle... especially when cold. If you have cold idle problems, there are not that many things that could be wrong. The Chilton manual explains them all, so do us a favour and read your Chilton manual. Same with the hot idle problem. All the sensors that control idle are under driveability and emissions, in chapter 4 if I recall correctly.
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Old 24-Sep-2003, 10:12 AM
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thanks
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