Bouncing idle issue once warmed up...

Post by **Merlin** » Tue Mar 01, 2016 11:24 am

vanzep wrote:Im not 100 percent sure but idle issues can possibly be linked to alternator on its way out.

My bouncing stopped after an alternator change.

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

Post by **Merlin** » Tue Mar 01, 2016 11:32 am

vanzep wrote:Ive now got the low rpm stumbling on the BB1

You can test to see what that is. If you remove the electrical connector on the IACV revs should drop to 500rpm, if it is lower than that you can adjust the idle screw on the TB.

Post by **vanzep** » Tue Mar 01, 2016 11:37 am

cheers will have a look at this today

Lankysod07 · Post by **Lankysod07** » Tue Mar 01, 2016 1:21 pm

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.

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.

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

Post by **Drax** » Tue Mar 01, 2016 2:15 pm

hopefully its not as bad as my last idle hunting reason that i found after removing the engine last week...

Post by **Merlin** » Tue Mar 01, 2016 2:19 pm

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 head

It was green paper the gasket on my new engine.

Post by **Drax** » Tue Mar 01, 2016 2:30 pm

Merlin 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 head It was green paper the gasket on my new engine.

those green paper ones are a c0ck to get off

this one was BGA i think, not buying them again

Post by **Merlin** » Tue Mar 01, 2016 2:32 pm

You are not kidding, ballache. Its almost worth the £55 for a Hondata gasket as they are reusable and the Hondabond peels right off them