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bouncing idle when cold

 
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Old 06-06-2010, 03:36 PM
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bouncing idle when cold

I have a 1997 prelude non sh and when i start the car the idle bounce between 1500 and 2500 rpm and sometime i can hear a sound from the cold air like SHHHHHH. But when he get his temp, all is normal. Could it be the iacv? i have no air leak and no air in prestone. I tryed to clean the iacv but no result. Help me!!!
sorry for my english i speak french.
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Old 06-06-2010, 04:29 PM
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Re: bouncing idle when cold

Usually I'm the last one to tell someone to search, but look for the "final idle problem thread." I think its in the General tech section. It will tell you what you need to know.
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Old 06-06-2010, 04:48 PM
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Re: bouncing idle when cold

FAST IDLE VALVE. there is a idle controller under your throttle body.... i usually gets stuck causing your idle to bounche "search for idle". easy thing to do ... "fast idle bypass".
start off by carefully taking your throttle body off....with out ripping the paper gasket. then flip it over you will see 3 10mm bolts holding on the fast idle valve. you will also have two hoses attached. you will first loop those hoses "coolant bypass mod". one to the thermostat housing... the other to the iac valve. loop each one to themselves. thermo to thermo and iac to iac. now... back to the fast idle valve.

remove the 3 10mm bolts. take the idle valve... get a piece of sheet metal.... trace a template of the idle vavle onto the sheet metal. then cut to form. place the idle valve over metal....take a hammer and use one of the bolts that you removed... use that to make depressions on the sheet metal so you will know where to make a hole so that when you line the idle valve and the metal together it can be mounted back to the throttle body perfectly. try your best to get the metal and valve to line up correctly. then.... get some grey aluminum silicone and be a little over generous. bolt everything back together. i know i suck at explaining things but... you can always search for the fast idle bypass ...there is tons of write ups.
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Old 06-06-2010, 04:52 PM
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Re: bouncing idle when cold

I think it has more to do with his coolant temp sensor or the thing you twist all the way in and back out a quarter turn. Thats how my boy fixed his and he had the exact same prob. No fab work needed.
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Old 06-06-2010, 07:42 PM
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Re: bouncing idle when cold

Listen to bustr. i had the same prob.. and sometimes just checking all the options is better in the long run.. I have a blocker plate on mine and that was the only way to fix it.. but i did buy a new fast idle valve and Idle valve control. just to be safe. even changed out my throttle postion sensor.. The blocker plate was what fixed the issue..
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Old 06-06-2010, 09:09 PM
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Re: bouncing idle when cold

the FINAL idle problem thread!!!!!
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