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

morrismen · Mar 19th, 2014, 20:59

Started today. On driving from cold with a normal start, went to the first roundabout 5 mins and my V40 started to "hunt". When home, checked it over.

Symptoms:
1. The engine fan comes on every 2 mins
2. The car runs fine for 15 seconds then starts to hunt like its running on 3 cylinders like its missing, then it reverts to running normally again in a cyclic pattern - some sort of feedback loop cutting in perhaps?
3. Checked coil packs but there's no electric leaks or the like
4. Disconnected MAF and engine alters so probably not this
5. Disconnected TPS and revs cut out and stalls so maybe not this
6. The thermostat appears fine; engine at correct temp. Air con on and it hunts more though.
7. On the last restart, the engine management light has now stayed on

Not sure if I should be driving it now? Help needed.

Thanks

Matt86 · Mar 19th, 2014, 21:03

Can you get the code from EML read?

morrismen · Mar 19th, 2014, 21:06

Sorry, don't have a code reader at the moment. Must get one sometime... One point I did note though, the other day I heard like air bubbles in the dash board? Yes, sounds silly I know... Is this a possibility?

pierremcalpine · Mar 20th, 2014, 12:58

For what it's worth, here in Toronto, you can head to the local Autoparts.ca store and they come right out of the store with their code reader and read 'em off for you...you may find that a store near you offers the same service for free. It's quite handy.

gavT5 · Mar 20th, 2014, 19:27

Bubbling in the coolant system is likely an airlock in the coolant system, ive had a similar running problem, it was a blocked injector that was stuck and ive had a fuel system flush done, its helped, when its missing it may be fuel flooding that spark plug, if you dnt find any major probs on full throttle i would say overfueling, or idle control valve

morrismen · Mar 21st, 2014, 10:42

Thanks for the feedback. I had a spod at work say he had the same problem on his Toyota last week so I wondered if its fuel related. However, he's used a different petrol station to me so unlikely this. But he took his car to the local garage and they told him it was the "EGR" which recycles "gases". Costly they told him, so they recommended using "Ultimate" high ron petrol to clear it out and he said this fixed it.

So, questions I have now (wandering going down this rat hole):
Where is the EGR on a V40 and what is it or what's the equivalent component on a V40?

gatos · Mar 21st, 2014, 12:14

There is no EGR on the Volvo petrol engines. Only the 1.9D and the God Damn It (GDI) have it

morrismen · Mar 21st, 2014, 13:14

Thanks Gatos. Good info. So what does the V40/S40 have instead of an EGR? How does it re-circulate exhaust fumes to adjust engine? Would that be a Lambda feedback loop perhaps?

gatos · Mar 21st, 2014, 13:19

Quote:

Originally Posted by morrismen

Thanks Gatos. Good info. So what does the V40/S40 have instead of an EGR? How does it re-circulate exhaust fumes to adjust engine? Would that be a Lambda feedback loop perhaps?

No gas recirculation on the normal petrol cars at all/. They run smoothly enough as they are. Why ruin them.....

morrismen · Mar 21st, 2014, 13:42

ok, what about an oil "air" valve? Is there a PCV or the like? And where is it? I wonder if some "air" lock occurred in the oil pipe perhaps? Of course could be an injector blocked perhaps.

Mar 19th, 2014, 20:59	#1
morrismen Senior Member Last Online: May 3rd, 2023 13:02 Join Date: Dec 2003 Location: London	Eratic Idle - Engine Management light on - Need HELP! Started today. On driving from cold with a normal start, went to the first roundabout 5 mins and my V40 started to "hunt". When home, checked it over. Symptoms: 1. The engine fan comes on every 2 mins 2. The car runs fine for 15 seconds then starts to hunt like its running on 3 cylinders like its missing, then it reverts to running normally again in a cyclic pattern - some sort of feedback loop cutting in perhaps? 3. Checked coil packs but there's no electric leaks or the like 4. Disconnected MAF and engine alters so probably not this 5. Disconnected TPS and revs cut out and stalls so maybe not this 6. The thermostat appears fine; engine at correct temp. Air con on and it hunts more though. 7. On the last restart, the engine management light has now stayed on Not sure if I should be driving it now? Help needed. Thanks __________________ Volvo V40 1.8 Petrol SE 2003

Mar 19th, 2014, 21:03	#2
Matt86 Premier Member Last Online: Aug 1st, 2015 09:34 Join Date: Oct 2013 Location: Southampton	Can you get the code from EML read? __________________ V40 1.9D 2004 Car Photos

Mar 19th, 2014, 21:06	#3
morrismen Senior Member Last Online: May 3rd, 2023 13:02 Join Date: Dec 2003 Location: London	Sorry, don't have a code reader at the moment. Must get one sometime... One point I did note though, the other day I heard like air bubbles in the dash board? Yes, sounds silly I know... Is this a possibility? __________________ Volvo V40 1.8 Petrol SE 2003

Mar 20th, 2014, 12:58	#4
pierremcalpine Premier Member Last Online: Jan 3rd, 2024 14:43 Join Date: Feb 2012 Location: Toronto Canada	For what it's worth, here in Toronto, you can head to the local Autoparts.ca store and they come right out of the store with their code reader and read 'em off for you...you may find that a store near you offers the same service for free. It's quite handy. __________________ 2003 V40 1.9T B4204T4, 197,000miles (sold but alive!), 2004 S60 2.5T, 160,000miles, 2010 V70 3.2, 125,000miles, 2002 V70XC 2.4, 175,000miles Click here for my x40 and V70 P3 repair guides

Mar 20th, 2014, 19:27	#5
gavT5 Member Last Online: Oct 2nd, 2019 01:52 Join Date: Feb 2011 Location: essex	Bubbling in the coolant system is likely an airlock in the coolant system, ive had a similar running problem, it was a blocked injector that was stuck and ive had a fuel system flush done, its helped, when its missing it may be fuel flooding that spark plug, if you dnt find any major probs on full throttle i would say overfueling, or idle control valve __________________ '98 V70 T5 CD - WARBLING FUEL DRINKER '02 V40 T4 SPORT LUX - "MAYA"

Mar 21st, 2014, 10:42	#6
morrismen Senior Member Last Online: May 3rd, 2023 13:02 Join Date: Dec 2003 Location: London	Thanks for the feedback. I had a spod at work say he had the same problem on his Toyota last week so I wondered if its fuel related. However, he's used a different petrol station to me so unlikely this. But he took his car to the local garage and they told him it was the "EGR" which recycles "gases". Costly they told him, so they recommended using "Ultimate" high ron petrol to clear it out and he said this fixed it. So, questions I have now (wandering going down this rat hole): Where is the EGR on a V40 and what is it or what's the equivalent component on a V40? __________________ Volvo V40 1.8 Petrol SE 2003 Last edited by morrismen; Mar 21st, 2014 at 10:46.

Mar 21st, 2014, 12:14	#7
gatos Premier Member Last Online: Nov 15th, 2022 21:34 Join Date: Apr 2010 Location: London / Essex	There is no EGR on the Volvo petrol engines. Only the 1.9D and the God Damn It (GDI) have it __________________ Current car: 2002 S40 1.9D, 1992 240SE Nullius in Verba

Mar 21st, 2014, 13:14	#8
morrismen Senior Member Last Online: May 3rd, 2023 13:02 Join Date: Dec 2003 Location: London	Thanks Gatos. Good info. So what does the V40/S40 have instead of an EGR? How does it re-circulate exhaust fumes to adjust engine? Would that be a Lambda feedback loop perhaps? __________________ Volvo V40 1.8 Petrol SE 2003

Mar 21st, 2014, 13:42	#10
morrismen Senior Member Last Online: May 3rd, 2023 13:02 Join Date: Dec 2003 Location: London	ok, what about an oil "air" valve? Is there a PCV or the like? And where is it? I wonder if some "air" lock occurred in the oil pipe perhaps? Of course could be an injector blocked perhaps. __________________ Volvo V40 1.8 Petrol SE 2003

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