Idle problem

gazza1971 · 10-07-15, 07:26 PM

Took the car out tonight for a run 1993 2.0 16v coupe perfect until the journey home and now it won't idle cuts out every junction or when u change gear but runs perfect when driving ? Any ideas

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audizzz · 10-07-15, 08:12 PM

Wonder how valid this info is but had same problem develop on a journey in my (dare I say it) PROTON.

An earth wire connection had corroded, 30 second fix by my mechanic.

Had to keep the revs up and brake with my right foot on journey home.

audizzz · 10-07-15, 08:15 PM

Make that left foot

Ben · 10-07-15, 09:29 PM

Does it try to idle with the revs rising and falling but stalls, or does it just die coming off the throttle?

gazza1971 · 10-07-15, 09:32 PM

Dies when u come of throttle and was taking around 5 seconds or so to start.

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Hanuman · 10-07-15, 11:01 PM

(Was writing this earlier when the battery died.)

Is idle entirely controlled via ecu/valve? If so, my guess, and it is just a guess, is the idle control. Signal to, connection, or valve itself.
A bad closed throttle switch on one of mine results in similar behaviour to older cars with blocked idle screw. Revs stabilise slowly, dies approaching junctions.
Presumably, so long as your foot is on the throttle, it stays running.
What about when you start it? Does it try to start? Die straight away?

gazza1971 · 11-07-15, 01:13 AM

Exactly as you describe it does can u clean the idle control valve ? Going to get it in to a garage today see were it goes from there. Thanks.

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Ben · 11-07-15, 04:41 AM

The link is not working.

msh · 11-07-15, 05:58 AM

Before you mess up your ISV with the so called "cleaning", check all intake elements. No idle and hard start more sounds like small air leak.

gazza1971 · 11-07-15, 02:12 PM

It's booked it to a Audi specialist Wednesday going to start with a smoke test for air leaks. Thanks guys for the input.

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10-07-15, 09:29 PM	#4
Ben 4 ring whore! Classic Audi Club Member Join Date: Mar 2008 Location: Stockport Posts: 2,348	Does it try to idle with the revs rising and falling but stalls, or does it just die coming off the throttle? __________________ 1992 80 quattro 20vt

10-07-15, 09:32 PM	#5
gazza1971 Grown up member Classic Audi Club Member Join Date: Jun 2015 Location: Derby Posts: 40	Dies when u come of throttle and was taking around 5 seconds or so to start. Sent from my iPhone using Tapatalk __________________ 1993 B4 Coupe 16v

10-07-15, 11:01 PM	#6
Hanuman Trickster Classic Audi Club Member Join Date: May 2009 Location: Heckling from the cheap seats, Phnom Penh, KoW Posts: 7,018	(Was writing this earlier when the battery died.) Is idle entirely controlled via ecu/valve? If so, my guess, and it is just a guess, is the idle control. Signal to, connection, or valve itself. A bad closed throttle switch on one of mine results in similar behaviour to older cars with blocked idle screw. Revs stabilise slowly, dies approaching junctions. Presumably, so long as your foot is on the throttle, it stays running. What about when you start it? Does it try to start? Die straight away? __________________ 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

11-07-15, 01:13 AM	#7
gazza1971 Grown up member Classic Audi Club Member Join Date: Jun 2015 Location: Derby Posts: 40	Exactly as you describe it does can u clean the idle control valve ? Going to get it in to a garage today see were it goes from there. Thanks. Sent from my iPhone using Tapatalk __________________ 1993 B4 Coupe 16v

11-07-15, 04:41 AM	#8
Ben 4 ring whore! Classic Audi Club Member Join Date: Mar 2008 Location: Stockport Posts: 2,348	The link is not working. __________________ 1992 80 quattro 20vt

10-07-15, 08:12 PM	#2
audizzz Grown up member Classic Audi Club Member Join Date: Nov 2013 Posts: 125	Wonder how valid this info is but had same problem develop on a journey in my (dare I say it) PROTON. An earth wire connection had corroded, 30 second fix by my mechanic. Had to keep the revs up and brake with my right foot on journey home.

10-07-15, 08:15 PM	#3
audizzz Grown up member Classic Audi Club Member Join Date: Nov 2013 Posts: 125	Make that left foot

11-07-15, 05:58 AM	#9
msh 4 ring whore! Join Date: Jun 2008 Location: Rucava, Latvija Posts: 3,816	Before you mess up your ISV with the so called "cleaning", check all intake elements. No idle and hard start more sounds like small air leak.

11-07-15, 02:12 PM	#10
gazza1971 Grown up member Classic Audi Club Member Join Date: Jun 2015 Location: Derby Posts: 40	It's booked it to a Audi specialist Wednesday going to start with a smoke test for air leaks. Thanks guys for the input. Sent from my iPhone using Tapatalk __________________ 1993 B4 Coupe 16v