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idle air control valve ?

Help, Advice, Owners' Discussion and DIY Tutorials on S40 and V40. In this forum you'll find S40/V40-specific owners asking and answering questions on maintenance, ownership, repairs, tutorials and almost every do-it-yourself thing you can do to save money owning these Volvos.

1996 - 2004 S40
1996 - 2004 V40

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emtor
Posts: 24
Joined: Mon Jan 23, 2017 1:35 am
Year and Model: 2002 V40
Location: Norway
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idle air control valve ?

Post by emtor »

Volvo V40 2002
1.8 litre petrol engine (non turbo, non GDI).

Bought the car last summer, been running flawlessly.
Idles @ 1000 rpm when cold, dropping to 800 rpm when warmed up.

Started the car yesterday and let it idle for 10 minutes.
Drove a mile and parked outside a shop.
Stopped the engine for a few seconds and started it again.
Engine started as usual but stalled after a couple of seconds.
Attempted to re-start three or four times,-same result,-engine stalled.
On the last attempt I pressed the accelerator slightly and the engine kept running.
When letting go of the accelerator the engine idled rough with slight intermittent dropping of rpm.
Went back home and the engine was idling normally at the parking lot for several minutes.
Check engine light did NOT come on.
Could this be the IAC valve acting up?

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alschnertz
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Joined: Fri Apr 29, 2011 9:25 am
Year and Model: 1995 854T
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Post by alschnertz »

I guess it's possible.
If you've never cleaned the IAC or the throttle body, it may be a good place to start.
Especially if you have no codes.

Next thing I'd go to if the symptoms persist after the cleaning would be to check the fuel pressure which should be around 44 psi.
'60 PV544, '68 220, '70 145S, '86 745T, '95 854T, '01 S40
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emtor
Posts: 24
Joined: Mon Jan 23, 2017 1:35 am
Year and Model: 2002 V40
Location: Norway
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Post by emtor »

Worst thing is when a car experiences a glitch that never repeats itself. Makes you wait for the next occurrence for ever and ever.
Luckily the symptom repeated itself the next day. Seems like this has become more or less permanent which makes fault finding easier.
No, neither the IACV nor the throttle body has ever been cleaned.
Shopping list: Carb cleaner, fault code reader and a pressure gauge . . .

iamn8
Posts: 18
Joined: Mon Jan 11, 2010 7:57 am
Year and Model: 2003
Location: Providence, RI

Post by iamn8 »

You'll be surprised what comes out of the IACV. Definitely a good place to start.

johncham
Posts: 4
Joined: Tue May 30, 2017 12:52 pm
Year and Model: 2000 s40
Location: san mateo, ca

Post by johncham »

Hey Emtor. Did you resolve the stalling issue? Mine stalled yesterday in traffic. Road flares failed to ignite (too old), and it was a terrible experience. Hasn't occurred again, but I am on pins and needles now. Currently throwing out P0107 DTC (MAP sensor low), but I will need to remove the fuel rail. Part ordered. Anything? Anyone???

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