S40 V40 Cars: - Eratic Idle - Engine Management light on - Need HELP! - Page 3

gavT5 · Mar 24th, 2014, 20:30

I have the same on my 03 T4, cant work it out, doin my head and my wallet in

morrismen · Mar 24th, 2014, 20:55

I reckon this all started when I put some petrol in last week. So, I reckon it "could" be dirty fuel. So I filled it up from 1/2 full with high octane 98 fuel when I went to see Gatos and its only improved slightly. So, if it is dirty fuel, then I now have a FULL tank of the crap to get rid of. Darn it.

Meanwhile, I'm going back to basics and gonna order some spark plugs to eliminate the blooming obvious now.

gavT5, if you get to root cause, let me know... I'll do the same

Batfink · Mar 24th, 2014, 21:40

Quick and easy test, have you tried unplugging the Evap solenoid top right of the radiator?

Nice free test to help at least one more thing out.

gavT5 · Mar 24th, 2014, 21:43

Will do, i only run mine ever on v power nitro, and have tried adding 44k fuel system cleaner and its got a little bit better, thought id cured it, gave the car a bit of a spanking home, did it again! Bloody thing

morrismen · Mar 25th, 2014, 00:07

Hi Batfink, thanks for the suggestion. When you say "unplugging the Evap solenoid top right of the radiator" do you mean unplugging it and then re-plugging it immediately to reset something, or do you mean unplugging it permanently? If the latter, what will this cause and resolve please? Just want to see "cause and effect" to see what I'm to be looking for. Thanks again.

Batfink · Mar 25th, 2014, 00:30

Basically, from my understanding it is a valve which allows fuel vapour from the Evap emission system to enter into the intake manifold.

If the solenoid starts to fail it can create a vacuum leak, which can, depending on the severity of the malfunction cause the ICV to be rendered useless.

Given that it is a way for air to bypass any of the intake related sensors (MAF) it can use havoc with idle and even running.

By unplugging is completely, just the connector, if it is part of the problem your car should idle better. If it isn't you'll notice no difference to what you are currently witnessing so just plug it back in.

I only mention it as it can cause some serious issues but is often over looked. By unplugging it though it will set a fault.

morrismen · Mar 25th, 2014, 13:03

I guess this is also called the "Evap Valve"? If it's what I think it is re top right of the radiator as Batfink suggests, then it should be easy to replace, or clean providing it pulls off the pipes easily without breaking? Has anyone ever cleaned one out? If I pour petrol in it, will it clean it thoroughly, or is this a big "No-No"?

And, why did Volvo put a fuel evap valve on top of a hot radiator? What's the logic here?

Batfink · Mar 25th, 2014, 13:29

Yes it is also known as the Evap Valve.

Part Number 9470775 or search for Pierburg 7.22517.02 (got this off an old one from my S40)

Not entire sure if they are cleanable of not.

morrismen · Mar 25th, 2014, 13:57

Just checked part no 9470775 and they're full of charcoal so likely a disposable item. However, petrol cleans up anything, and when its a fuel evap valve, then it may just work lol - so I'll give it a try

What can I loose! Desparate times call for desparate measures.

KBB · Mar 25th, 2014, 14:06

If you increase the revs and hold it dose the engine still miss or run ok?

Mar 24th, 2014, 20:30	#21
gavT5 Member Last Online: Oct 2nd, 2019 01:52 Join Date: Feb 2011 Location: essex	I have the same on my 03 T4, cant work it out, doin my head and my wallet in __________________ '98 V70 T5 CD - WARBLING FUEL DRINKER '02 V40 T4 SPORT LUX - "MAYA"

Mar 24th, 2014, 20:55	#22
morrismen Senior Member Last Online: May 3rd, 2023 13:02 Join Date: Dec 2003 Location: London	I reckon this all started when I put some petrol in last week. So, I reckon it "could" be dirty fuel. So I filled it up from 1/2 full with high octane 98 fuel when I went to see Gatos and its only improved slightly. So, if it is dirty fuel, then I now have a FULL tank of the crap to get rid of. Darn it. Meanwhile, I'm going back to basics and gonna order some spark plugs to eliminate the blooming obvious now. gavT5, if you get to root cause, let me know... I'll do the same __________________ Volvo V40 1.8 Petrol SE 2003

Mar 24th, 2014, 21:40	#23
Batfink Member Last Online: Nov 26th, 2017 15:38 Join Date: Sep 2012 Location: Harrogate	Quick and easy test, have you tried unplugging the Evap solenoid top right of the radiator? Nice free test to help at least one more thing out. __________________ Currently: 2001 S40 1.8 Sport (non GDi) - Going to call it Fibonacci

Mar 24th, 2014, 21:43	#24
gavT5 Member Last Online: Oct 2nd, 2019 01:52 Join Date: Feb 2011 Location: essex	Will do, i only run mine ever on v power nitro, and have tried adding 44k fuel system cleaner and its got a little bit better, thought id cured it, gave the car a bit of a spanking home, did it again! Bloody thing __________________ '98 V70 T5 CD - WARBLING FUEL DRINKER '02 V40 T4 SPORT LUX - "MAYA"

Mar 25th, 2014, 00:07	#25
morrismen Senior Member Last Online: May 3rd, 2023 13:02 Join Date: Dec 2003 Location: London	Hi Batfink, thanks for the suggestion. When you say "unplugging the Evap solenoid top right of the radiator" do you mean unplugging it and then re-plugging it immediately to reset something, or do you mean unplugging it permanently? If the latter, what will this cause and resolve please? Just want to see "cause and effect" to see what I'm to be looking for. Thanks again. __________________ Volvo V40 1.8 Petrol SE 2003

Mar 25th, 2014, 00:30	#26
Batfink Member Last Online: Nov 26th, 2017 15:38 Join Date: Sep 2012 Location: Harrogate	Basically, from my understanding it is a valve which allows fuel vapour from the Evap emission system to enter into the intake manifold. If the solenoid starts to fail it can create a vacuum leak, which can, depending on the severity of the malfunction cause the ICV to be rendered useless. Given that it is a way for air to bypass any of the intake related sensors (MAF) it can use havoc with idle and even running. By unplugging is completely, just the connector, if it is part of the problem your car should idle better. If it isn't you'll notice no difference to what you are currently witnessing so just plug it back in. I only mention it as it can cause some serious issues but is often over looked. By unplugging it though it will set a fault. __________________ Currently: 2001 S40 1.8 Sport (non GDi) - Going to call it Fibonacci

Mar 25th, 2014, 13:03	#27
morrismen Senior Member Last Online: May 3rd, 2023 13:02 Join Date: Dec 2003 Location: London	I guess this is also called the "Evap Valve"? If it's what I think it is re top right of the radiator as Batfink suggests, then it should be easy to replace, or clean providing it pulls off the pipes easily without breaking? Has anyone ever cleaned one out? If I pour petrol in it, will it clean it thoroughly, or is this a big "No-No"? And, why did Volvo put a fuel evap valve on top of a hot radiator? What's the logic here? __________________ Volvo V40 1.8 Petrol SE 2003 Last edited by morrismen; Mar 25th, 2014 at 13:19.

Mar 25th, 2014, 13:29	#28
Batfink Member Last Online: Nov 26th, 2017 15:38 Join Date: Sep 2012 Location: Harrogate	Yes it is also known as the Evap Valve. Part Number 9470775 or search for Pierburg 7.22517.02 (got this off an old one from my S40) Not entire sure if they are cleanable of not. __________________ Currently: 2001 S40 1.8 Sport (non GDi) - Going to call it Fibonacci

Mar 25th, 2014, 13:57	#29
morrismen Senior Member Last Online: May 3rd, 2023 13:02 Join Date: Dec 2003 Location: London	Just checked part no 9470775 and they're full of charcoal so likely a disposable item. However, petrol cleans up anything, and when its a fuel evap valve, then it may just work lol - so I'll give it a try What can I loose! Desparate times call for desparate measures. __________________ Volvo V40 1.8 Petrol SE 2003

Mar 25th, 2014, 14:06	#30
KBB Master Tech Last Online: May 18th, 2020 10:57 Join Date: Dec 2006 Location: On Contract Dubai Automotve Technical Academy	If you increase the revs and hold it dose the engine still miss or run ok?

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