VX SS Manual, Revs drop to almost stall when disengaging clutch while driving

[Nathaniel_P]

Hey guys, seems I've got a problem with the old girl, when driving along, any time i put the clutch in, the revs drop to an almost stall, jump a bit and then and then gradually struggle back up to idle, this seems to happen pretty much any time i take load off the engine, any suggestions? Cheers

 

[BlackVXGTS]

How stable is the normal idle and at what revs? When were your spark plugs last changed?

 

[Nathaniel_P]

The plugs are probably due for a change, regular idle is about 800-1000rpm, it's generally pretty stable with the odd shudder

 

[dirty hands]

service the engine then post back.. if no better

 

[Nathaniel_P]

All sorted at this stage, PCV valve was rooted, running a lot better now

 

[Nathaniel_P]

Nope, back again, service done, a bit of oil in the pcv hose and valve, only having the problem at low rpm when the engines cold, so cruising at 1500-2k rpm, take your foot off the accelerator and the revs drop below 300 rpm, sometimes even stalling, but then sometimes she's fine, any suggestions guys?

 

[vr304]

My vx ss manual does this too only occasionally tho in my case I suspect the dodgy mail order tune that it's got although I could be wrong

 

[Nathaniel_P]

I was considering that, but i got it tuned and dyno'd like 2 months ago and haven't had a problem, it's only started over the past 2 weeks, is there anything that can throw out a tune?

 

[vr304]

Wouldn't think other than a dodgy sensor etc

 

[Nathaniel_P]

The o2 sensors have 2 loops right? Could it be a faulty low end loop on a custom tune?