Project 190 - idle issue

Typhoon190 · 24th May 2015, 09:48

Just wondering if anyone has any thoughts on this please.

My project 190 is currently undergoing a rear suspension refurb, but I obviously keep the battery charged, and run her up to temperature, taking the revs up to keep things happy.

On returning to idle, the revs ' bounce' as if she's going to stall, but trying not to, for about 5-10 seconds. It only seems to happen when I blip the throttle. Taking the revs up, and then gently returning to idle seems ok.

Does this sound like an air leek issue, or does anyone have any other ideas please.

SD1too · 24th May 2015, 11:21

Hi Ben,

My V6 exhibits this hunting idle syndrome periodically, yet we seem to be in the minority. I think it was PhilT4 who suggested that it was a sign of a less than fully charged battery, but sadly tests have ruled that out in my case. I have dismantled and cleaned my idle control valve with no long term improvement. On the list is to fit the repair kit but I haven't got round to it yet.

Simon

ProfDave · 24th May 2015, 12:14

Mine did this when I had a leaky seal around the power vis.......

RodgerD · 24th May 2015, 13:05

Sticky AICV ? not responding quickly to catch the idle when throttle butterfly is closed.

SD1too · 24th May 2015, 14:43

Quote:

Originally Posted by ProfDave

Mine did this when I had a leaky seal around the power vis.......

Thanks Dave. I'll check mine.

Simon

Typhoon190 · 24th May 2015, 15:40

Thanks all for the suggestions. I'll swap the idle control valve and see about air leaks and report back.

24th May 2015, 09:48	#1
Typhoon190 This is my second home MG ZT-T 190 Monogram Typhoon Join Date: Jan 2009 Location: Oxfordshire Posts: 4,712 Thanks: 328 Thanked 557 Times in 443 Posts	Project 190 - idle issue Just wondering if anyone has any thoughts on this please. My project 190 is currently undergoing a rear suspension refurb, but I obviously keep the battery charged, and run her up to temperature, taking the revs up to keep things happy. On returning to idle, the revs ' bounce' as if she's going to stall, but trying not to, for about 5-10 seconds. It only seems to happen when I blip the throttle. Taking the revs up, and then gently returning to idle seems ok. Does this sound like an air leek issue, or does anyone have any other ideas please.

24th May 2015, 11:21	#2
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,486 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Hi Ben, My V6 exhibits this hunting idle syndrome periodically, yet we seem to be in the minority. I think it was PhilT4 who suggested that it was a sign of a less than fully charged battery, but sadly tests have ruled that out in my case. I have dismantled and cleaned my idle control valve with no long term improvement. On the list is to fit the repair kit but I haven't got round to it yet. Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

24th May 2015, 12:14	#3
ProfDave This is my second home ZTT, Contemp Saloon, Duotone Tourer Join Date: May 2012 Location: Llandeilo Posts: 4,192 Thanks: 290 Thanked 387 Times in 333 Posts	Mine did this when I had a leaky seal around the power vis.......

24th May 2015, 13:05	#4
RodgerD Rodger & Out Rover 75 Saloon Join Date: Nov 2014 Location: London Posts: 712 Thanks: 10 Thanked 159 Times in 141 Posts	Sticky AICV ? not responding quickly to catch the idle when throttle butterfly is closed.

24th May 2015, 15:40	#6
Typhoon190 This is my second home MG ZT-T 190 Monogram Typhoon Join Date: Jan 2009 Location: Oxfordshire Posts: 4,712 Thanks: 328 Thanked 557 Times in 443 Posts	Thanks all for the suggestions. I'll swap the idle control valve and see about air leaks and report back.