My bouncing stopped after an alternator change.vanzep wrote:Im not 100 percent sure but idle issues can possibly be linked to alternator on its way out.
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Bouncing idle issue once warmed up...
Engine/Gearbox questions and discussion
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Post by vanzep » Tue Mar 01, 2016 11:29 am
yeah i thought that - i know cleaning the fitv stopped my bouncing idle on my BB4 but i was still getting the idle dropping low when stopping at junctions/lights tec - it would stumble about between 300-500rpm so was on the low side - replacing the alternator fixed that. Ive now got the low rpm stumbling on the BB1 

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vanzep
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Post by vanzep » Tue Mar 01, 2016 11:37 am
cheers will have a look at this today 

1996-2000 1993 EG9 Blue Civic 1.6 Vti - Traded in against the BB4
2000-2019 1994 2WS BB4 Milano Red JDM Prelude Si VTEC LSD
2015 on > 1991 4WS BB1 Phantom Pearl Grey JDM Prelude Si VTEC LSD
2021 ON > 1998 2WS BB6 White Pearl JDM Prelude Si VTEC
2000-2019 1994 2WS BB4 Milano Red JDM Prelude Si VTEC LSD
2015 on > 1991 4WS BB1 Phantom Pearl Grey JDM Prelude Si VTEC LSD
2021 ON > 1998 2WS BB6 White Pearl JDM Prelude Si VTEC
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Post by Lankysod07 » Tue Mar 01, 2016 1:21 pm
Just tried it, you was right. As soon as I plugged the hole it idles fine! I'll have a look at the FITV as soon as I have spare 30 min, cheers man much appreciated.NafemanNathan wrote:The Fitv (fast idle thermal valve) allows more air to by pass the throttle body on cold start up. They can quite often be problematic and cause the issue your having.
Start the car and allow it to warm up and start hunting. Then remove the induction pipe right up to your throttle body. Whilst the engine is still running and hunting block the lower large hole in the mouth of the throttle body with your thumb.
Hopefully the revs should drop and the car should idle fine. If this works it's because you are preventing the extra air from bypassing the throttle body. The engine no longer requires it because it's up to temperature, but a dodgy FITV will play silly buggers with your idle.
Your options are to either tinker with the FITV as sometimes they can self adjust, but the likelihood is it will need replacing.
If covering the hole does jack all its not the FITV at fault.
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Post by NafemanNathan » Tue Mar 01, 2016 1:27 pm
Still annoying it's playing up, but at least it's an easy find and hopefully fix 

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Post by Drax » Tue Mar 01, 2016 2:30 pm
those green paper ones are a c0ck to get offMerlin wrote:Is that an OEM gasket?
I would have loved to see that on the H22a I have just been cleaning up. No jobby it took me about 3 hours to get all of the intake manifold gasket off the headIt was green paper the gasket on my new engine.


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