Quick help request

Flying Frank · 21-02-16, 09:50 PM

After a few months of SORN and lay up over the last Winter, fired up the cq today.

Started very quickly and was out for a little run around and warm up ready for taxing next month. Of course I was driving on the private roads around my estate.

However, only snag is it refuses to idle and when the engine is in "over-run" there is a light occasional popping from the exhaust. ( By over-run , I mean when going down hill with the accelerator not depressed )

Any help or ideas appreciated please.

Emjay · 21-02-16, 09:56 PM

when you say it refuses to idle what are the symptoms? hunting between revs?. idling high?

Popping is usually the sign of a rich mix and petrol being burnt in the exhaust as I recall

Flying Frank · 22-02-16, 07:20 AM

Symptoms are an unwillingness to idle. Basically the car stalls/cuts out when coming to a standstill instead of idling at 8-900 rpm.
Yesterday, on one occasion when I re-started the car, it went up to an idle of 1200rpm; on "blipping" the throttle it then went up to 1500 rpm and a further blip sent it to 2,000rpm,each time holding the higher figure for about 5 seconds, but subsequently dropped back to a 1000 and then finally died away to zero.

Re-starts ok but will not hold idle.

Hanuman · 22-02-16, 04:03 PM

Do these have an idle stabilisation valve?

The description sounds similar to a bad valve, and possibly a dirty throttle body. I'd be looking at both of these. However, I know next to nothing about CQ, so I could be well off...

If there is an idle stab valve, it will look like a metal cylinder about 4-5 old inch things long, with connections in and out of the induction hoses, and an electrical connection, probably a 3 pin connection.

I found these on vagcat

Idle adjustment, item 5(?)

Idle stab, item 11

Flying Frank · 22-02-16, 04:24 PM

Many thanks Mark, I'm thinking along the lines of the ISV which I hope it is. A bad valve would not cause the engine to completely stall would it?

I'll have a look-see tomorrow. It seems like a problem caused by possibly damp as we've had more than our fair share of damp this Winter.

Thanks again.

Jake Blight · 22-02-16, 05:35 PM

I know this is probably duff info but I had a Volvo do this a long time ago and it was as I remember a fuel pump relay dying of old age.. (The garage I used went straight to it when I explained what was happening.). This is however a long time ago so I wouldn't treat it as the fix you need. Hope you get it sorted Frank.

Flying Frank · 22-02-16, 05:43 PM

Thanks Jake, all ideas gratefully received. Thats a big plus of this Forum where there is a wealth of experience and knowledge, plus of course kind hearted folk willing to help.

Pirvu Eugen · 22-02-16, 07:14 PM

With ignition on.... The idle stabiliser valve has to vibrate and make an buzzing noise.... Is doing this? Iff not...the idle swich, ISV relay.
Hope this helps! Anyhow... After soo manny months, the fuel is going bad and can block the cis injectors...
All the best!!

Flying Frank · 22-02-16, 07:35 PM

Quote:

Originally Posted by Pirvu Eugen

With ignition on.... The idle stabiliser valve has to vibrate and make an buzzing noise.... Is doing this? Iff not...the idle swich, ISV relay.
Hope this helps! Anyhow... After soo manny months, the fuel is going bad and can block the cis injectors...
All the best!!

Many thanks for the information, will check it all over tomorrow. Appreciate your time as well,

Pirvu Eugen · 22-02-16, 07:37 PM

With pleasure!!
Goodluck!!

22-02-16, 04:03 PM	#4
Hanuman Trickster Classic Audi Club Member Join Date: May 2009 Location: Heckling from the cheap seats, Phnom Penh, KoW Posts: 7,006	Quick help request Do these have an idle stabilisation valve? The description sounds similar to a bad valve, and possibly a dirty throttle body. I'd be looking at both of these. However, I know next to nothing about CQ, so I could be well off... If there is an idle stab valve, it will look like a metal cylinder about 4-5 old inch things long, with connections in and out of the induction hoses, and an electrical connection, probably a 3 pin connection. I found these on vagcat Idle adjustment, item 5(?) Idle stab, item 11 __________________ I wish they would keep the damned Chinese away now that I can go home, so that I can enjoy Fish amok and a draught Angkor Last edited by Hanuman; 22-02-16 at 04:07 PM.

21-02-16, 09:56 PM	#2
Emjay Man Fettler Extraodinaire Classic Audi Club Member Join Date: Jul 2008 Location: Up my own arse blowing smoke Posts: 7,417	when you say it refuses to idle what are the symptoms? hunting between revs?. idling high? Popping is usually the sign of a rich mix and petrol being burnt in the exhaust as I recall

22-02-16, 07:20 AM	#3
Flying Frank 4 ring whore! Classic Audi Club Member Join Date: Dec 2012 Location: Kernow, Gods own county !! Posts: 2,388	Symptoms are an unwillingness to idle. Basically the car stalls/cuts out when coming to a standstill instead of idling at 8-900 rpm. Yesterday, on one occasion when I re-started the car, it went up to an idle of 1200rpm; on "blipping" the throttle it then went up to 1500 rpm and a further blip sent it to 2,000rpm,each time holding the higher figure for about 5 seconds, but subsequently dropped back to a 1000 and then finally died away to zero. Re-starts ok but will not hold idle.

22-02-16, 04:24 PM	#5
Flying Frank 4 ring whore! Classic Audi Club Member Join Date: Dec 2012 Location: Kernow, Gods own county !! Posts: 2,388	Many thanks Mark, I'm thinking along the lines of the ISV which I hope it is. A bad valve would not cause the engine to completely stall would it? I'll have a look-see tomorrow. It seems like a problem caused by possibly damp as we've had more than our fair share of damp this Winter. Thanks again.

22-02-16, 05:35 PM	#6
Jake Blight Grown up member Classic Audi Club Member Join Date: Sep 2015 Location: Cornwall, near England Posts: 881	I know this is probably duff info but I had a Volvo do this a long time ago and it was as I remember a fuel pump relay dying of old age.. (The garage I used went straight to it when I explained what was happening.). This is however a long time ago so I wouldn't treat it as the fix you need. Hope you get it sorted Frank.

22-02-16, 05:43 PM	#7
Flying Frank 4 ring whore! Classic Audi Club Member Join Date: Dec 2012 Location: Kernow, Gods own county !! Posts: 2,388	Thanks Jake, all ideas gratefully received. Thats a big plus of this Forum where there is a wealth of experience and knowledge, plus of course kind hearted folk willing to help.

22-02-16, 07:14 PM	#8
Pirvu Eugen Newbie! Join Date: Feb 2016 Posts: 17	With ignition on.... The idle stabiliser valve has to vibrate and make an buzzing noise.... Is doing this? Iff not...the idle swich, ISV relay. Hope this helps! Anyhow... After soo manny months, the fuel is going bad and can block the cis injectors... All the best!!

22-02-16, 07:37 PM	#10
Pirvu Eugen Newbie! Join Date: Feb 2016 Posts: 17	With pleasure!! Goodluck!!