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Unstable Idle - R33

Penitent_Spark

By Penitent_Spark,
in General Maintenance

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Penitent_Spark Apprentice

Penitent_Spark

Posted
Posted

Hi All.

I have recently purchased a R33 Series one. What I have noticed at first was that it would idle hunt when warm, so much so that if left unchecked would stall. So over a matter of two weeks I cleaned the AAC valve and found a vacuum leak. The Oil Breather hose was split on the right side, so i replaced the oil breather hose with a second hand one, and replaced most of the vacuum hoses on the car, so now there is no ovious leak anywhere in the engine bay. Now the idle seems to have settled down, however it still hunts by about 50 - 100 rpm, the needle moves very slightly, Is this normal for an RB engine or is something else going on that I am not privy to?

Also there is a ticking sound at the back of the engine, near the power transistor pack and AAC valve area, it is not a rhythmic tick, but comes on and off occasionally, usually followed by one tick, then quickly by a double tick. This only occurs during Idle, is this just the AAC valve doing it's job?

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https://www.sau.com.au/forums/topic/374115-unstable-idle-r33/
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defari Grand Master

defari

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Posted (edited)

check your plugs - check the gapping - clean the afm - how old are the coil packs? my series 2 rb25det idles around 700 but occasionally jumps from that to 710 then down to 690 then plateaus again at 700rpm when its warmed up and idling.

the ticking could be injectors

Edited by defari

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