95civicdb

So my honda is having an idle problem only at cold start and it idle surges from 1500-2000rpms for about a minute and then sits at like 1800rpms until it gets alittle warm then it idles at normal 450rpms. So ive been hearing that the Fast Idle Thermo-Valve could be the problem, and i have also heard that you can block it off.

Any info on this would be great. Thanks

BryanM.

iTrader: (1)

That acctually sound pretty normal. All of my Hondas idle at about +/- 1800 rpms when it's cold.

FITV is supposed to raise the idle until the coolant warms up, then it closes and the IACV takes full control of idle air flow.

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WeakSauce92

Yup, it seems like normal operation for any vehicle actually

92shade

idle when warm should be about 800 +/- 50

95civicdb

I meant to say it surges from 1500-2000rpms when its cold and only lasts like a 1minute and then its fine, just idles at steady at 1800ish rpms until the car gets warm

BryanM.

iTrader: (1)

My OBD1 B16A did that for years, never bothered me, but if it drives you nuts try cleaning the FITV. There are a couple of good DIY threads kicking around here that still have working pictures.

Normal. It's trying to get warmed up.


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BryanM.

iTrader: (1)

'92-'95 Civic (with IACV connected)

D15Z1
Manual....600 +/- 50 rpm
Auto.......700 +/- 50 rpm

All others
Manual....670 +/- 50 rpm
Auto.......700 +/- 50 rpm

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95civicdb

Anybody ever bypassed the fitv tho?