surging idle when warm d15b8

D15, D16, D17 and Mini-Me swaps
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surging idle when warm d15b8

By Apexracing
- Thu Oct 15, 2009 3:23 pm #150941 hey guys my car has always wistled at high way speed, i thought maybe it was a door seal leak or whatever. and my idle has always seemed kinda low. any ways my civic's idle now surges in the usual range when stopped at a light or whatever after driving until the car is warm. my car burns oil i just thought id throw that out there. i ordred a new tb/im gasket. and for those who may not know the d15b8 8 valve engine uses different gaskets than the 16 valve versions. so if any one has any thing else to suggest while im at it by all means throw it out there.
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By Apexracing
- Thu Oct 15, 2009 4:54 pm #150999 edit it only surges when it is warm, what does that valve look like on a civic, i cleaned one on a accord i owned it had a white ball thing inside. lol
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By d-mon
- Thu Oct 15, 2009 10:20 pm #151062 have you bled your coolant?
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By teal_dx
- Fri Oct 16, 2009 2:06 am #151104
d-mon wrote:have you bled your coolant?


yeah what he said... do that first :thumb:

when your engine gets warm and the thermostat opens, you may not have enough coolant in your system then, causing the idle to bounce.
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By Apexracing
- Fri Oct 16, 2009 3:38 am #151120 edit i can drive it home it bounces at every stop, get home idle bounces turn car off and right back on and its fine. hmm
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By Apexracing
- Fri Oct 16, 2009 5:00 pm #151219 well i cleaned out what i am 90% sure was my Fast Idle Thermo Valve, it was located on the back of my intake manifold next to the throttle body, it did not come apart so i just sprayed it out with brake cleaner it looks alot cleaner so ill post the results tonight.
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By ikon
- Sat Oct 17, 2009 2:43 am #151347 thats the idle air control valve. the fast idle thermo valve is under the throttlebody. it has the coolant lines running to it.
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By Apexracing
- Sat Oct 17, 2009 4:06 am #151362 cx's are not located under the throttle body, they take a unit that does both, and it goes on the back of the intake manifold.
Last edited by Apexracing on Sat Oct 17, 2009 4:22 am, edited 1 time in total.
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By Apexracing
- Sat Oct 17, 2009 4:07 am #151364 http://www.hondapartsnow.com/online/Pag ... ageID=7416 460787&isBigPicture=False&refNo=,12,&isDisplayAll=False&ScrollBar=0


spraying out the fast idle valve portion of it has seemed to help but it has stuck twice since cleaning it out, but the idle quickly went back to normal, so ill spray it again and the throttle body out tomorrow.
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By ikon
- Sat Oct 17, 2009 10:24 am #151406 hhuuuuuhhhhh :? i did not know that... skooled.
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