S40 V40 Cars: - Intermittent idle issue

fullofpanache · Sep 19th, 2012, 06:39

Hi, I have a 1997 volvo v40 2.0 Petrol and recently it has been hesitating to rev when idling. The issue only occurs once the car has heated up and doesnt always happen.
the sympton is, when stopping at lights (etc.) the revs sit at 600-700rpm and wil feel like they are dipping (not continuously, maybe once or twice every 10 seconds), then on taking off they will hesitate and dip. Once it reaches 1500rpm, it appears fine and probaly wont occur again for another couple of days.

Local mechanic has recently replaced O2 sensor, both coil packs and thouroughly cleaned the throttle body.

No error or warning lights appear, unable to get a live reading of the ecu while driving.

Mechanic advised it could be the carbon clean that has affected the idle and the car may take 2000km to relearn the correct level. However the issue started just before i took the car in and had the coilpacks replaced.

Any ideas/suggestions are welcomed.

fullofpanache · Sep 20th, 2012, 10:12

bump bump

gatos · Sep 20th, 2012, 10:25

Have you cleaned the ICV (Idle Control Valve) ?

You could also try disconnecting the battery for half an hour and reset the ECU. No need to wait for 2000 miles. Just make sure you have your radio code as you will need it when reconnecting the battery.

fullofpanache · Sep 21st, 2012, 03:54

Thanks Gatos,
I have searched for a guide on cleaning the ICV but havnet found anything. Is it fairly straight forward or should I have a mechanic look at it?

bigyin85 · Sep 21st, 2012, 05:54

na its straight forward as i've gotta clean mine this weekend, if u put the search in google it will show u have 2 clean it, hope this helps

gatos · Sep 21st, 2012, 08:01

See here: http://www.volvoforums.org.uk/showthread.php?t=80435

fullofpanache · Sep 27th, 2012, 00:19

Thanks Gatos, I will give this a go at the weekend. I dont know if this is relevent but I notice it has been idling fine for the last week (dead on 700rpm and not moving), that is untill we had a 30 degree day and the vehicle was parked out in the Australian sun all day. Then it began hesitating on take off and dipping the revs on idle. Again once it reaches aroung 1500 rpm, no problem.

What components may be affected by the ambient temperature in this way? Could it be the cat convertor?

Anyway thanks again, I will give the ICV clean a go.

gatos · Sep 27th, 2012, 00:40

Are you by any chance using an induction kit?

monica horner · Nov 12th, 2015, 04:26

May I please pick your Volvo brain?! Have code 101. Have replaced spark plugs, fuel filter, mass air flow sensor, catalytic converter and one oxygen sensor, cleaned IAC and throttle body. Car occasionally stalls at idle. When it stalls check engine light is activated and current code is 101. It runs fine at highway speed. I've taken it to a specialist who is suggesting timing belt change and cam seals as belt is covered in oil. Could this really cause my driveability concern? Thank you in advance for your consideration. Monica Horner, Oxford, N.C., USA

Sep 19th, 2012, 06:39	#1
fullofpanache New Member Last Online: May 18th, 2013 03:26 Join Date: Sep 2012 Location: Adelaide	Intermittent idle issue Hi, I have a 1997 volvo v40 2.0 Petrol and recently it has been hesitating to rev when idling. The issue only occurs once the car has heated up and doesnt always happen. the sympton is, when stopping at lights (etc.) the revs sit at 600-700rpm and wil feel like they are dipping (not continuously, maybe once or twice every 10 seconds), then on taking off they will hesitate and dip. Once it reaches 1500rpm, it appears fine and probaly wont occur again for another couple of days. Local mechanic has recently replaced O2 sensor, both coil packs and thouroughly cleaned the throttle body. No error or warning lights appear, unable to get a live reading of the ecu while driving. Mechanic advised it could be the carbon clean that has affected the idle and the car may take 2000km to relearn the correct level. However the issue started just before i took the car in and had the coilpacks replaced. Any ideas/suggestions are welcomed.

Sep 20th, 2012, 10:25	#3
gatos Premier Member Last Online: Nov 15th, 2022 21:34 Join Date: Apr 2010 Location: London / Essex	Have you cleaned the ICV (Idle Control Valve) ? You could also try disconnecting the battery for half an hour and reset the ECU. No need to wait for 2000 miles. Just make sure you have your radio code as you will need it when reconnecting the battery. __________________ Current car: 2002 S40 1.9D, 1992 240SE Nullius in Verba

Sep 21st, 2012, 05:54	#5
bigyin85 S40 T4 Sport Last Online: Nov 21st, 2023 15:01 Join Date: Aug 2012 Location: Norwich	na its straight forward as i've gotta clean mine this weekend, if u put the search in google it will show u have 2 clean it, hope this helps __________________ Current motor 02' Volvo S40 T4 Panama Yellow, JT turning 3inch full stainless from turbo back, pipercross induction kit, forge dump valve and blanking plate, Coilovers, 17" Dezent Alloys Previous motor 97' Volvo V40 1.9 T4 CD 200bhp

Sep 21st, 2012, 08:01	#6
gatos Premier Member Last Online: Nov 15th, 2022 21:34 Join Date: Apr 2010 Location: London / Essex	See here: http://www.volvoforums.org.uk/showthread.php?t=80435 __________________ Current car: 2002 S40 1.9D, 1992 240SE Nullius in Verba

Sep 27th, 2012, 00:40	#8
gatos Premier Member Last Online: Nov 15th, 2022 21:34 Join Date: Apr 2010 Location: London / Essex	Are you by any chance using an induction kit? __________________ Current car: 2002 S40 1.9D, 1992 240SE Nullius in Verba

Sep 20th, 2012, 10:12	#2
fullofpanache New Member Last Online: May 18th, 2013 03:26 Join Date: Sep 2012 Location: Adelaide	bump bump

Sep 21st, 2012, 03:54	#4
fullofpanache New Member Last Online: May 18th, 2013 03:26 Join Date: Sep 2012 Location: Adelaide	Thanks Gatos, I have searched for a guide on cleaning the ICV but havnet found anything. Is it fairly straight forward or should I have a mechanic look at it?

Sep 27th, 2012, 00:19	#7
fullofpanache New Member Last Online: May 18th, 2013 03:26 Join Date: Sep 2012 Location: Adelaide	Thanks Gatos, I will give this a go at the weekend. I dont know if this is relevent but I notice it has been idling fine for the last week (dead on 700rpm and not moving), that is untill we had a 30 degree day and the vehicle was parked out in the Australian sun all day. Then it began hesitating on take off and dipping the revs on idle. Again once it reaches aroung 1500 rpm, no problem. What components may be affected by the ambient temperature in this way? Could it be the cat convertor? Anyway thanks again, I will give the ICV clean a go.

Nov 12th, 2015, 04:26	#9
monica horner New Member Last Online: Nov 14th, 2015 15:06 Join Date: Sep 2015 Location: oxford	May I pick your Volvo Brain?!! May I please pick your Volvo brain?! Have code 101. Have replaced spark plugs, fuel filter, mass air flow sensor, catalytic converter and one oxygen sensor, cleaned IAC and throttle body. Car occasionally stalls at idle. When it stalls check engine light is activated and current code is 101. It runs fine at highway speed. I've taken it to a specialist who is suggesting timing belt change and cam seals as belt is covered in oil. Could this really cause my driveability concern? Thank you in advance for your consideration. Monica Horner, Oxford, N.C., USA

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