Engine: D5244: - D5 rough idle when cold

skye740 · Jun 13th, 2021, 14:18

Hello all.

My D5 has developed a lumpy idle on starting from cold only, it doesn't show on rev counter so its only slight, but after having lived with the car for a long time, I know how it should sound, and once it's warm after driving its sounds as it should.

It also momentarily flashes on the dim screen no oil pressure on 1st start but I'm talking for a split second, where should I be looking for anything specific to start with?

It's due another 6000 mile oil change in a few hundred miles but for its mileage it barely uses any between changes.

TIA

Georgeandkira · Jun 13th, 2021, 15:38

We don't have the diesel engines in No. America so I'm "cross-guessing".

The oil pick up tube O-rings cracking with age has come up with the petrol engines. Maybe the diesels have the same setup and maintenance needs?

The oil filter crowd would mention the effectiveness / condition of the ADBV (Anti Drain Back Valve). Do the diesel filters have this? I can tell you from experience (again, all petrol) that ADBVs' operation range from perfect to non-existent.

A slight stumble in cold idling might be addressable using a known good injector cleaner. Two strong tankfuls. It'd be a cheap shot in the dark.

If your engine has the "mixing pipe (?)" which fills with black goo, maybe it's choking your idle air supply?

How many miles are on your car?

Wgl2020 · Jun 13th, 2021, 18:49

Have you scanned for any fault codes?

Glow plugs is a possibility.

Bashy · Jun 14th, 2021, 02:05

I too had/have this issue, and its deffo glow plug wiring for me, might not always show any codes for the wiring

skye740 · Jun 20th, 2021, 20:18

Quote:

Originally Posted by Bashy

I too had/have this issue, and its deffo glow plug wiring for me, might not always show any codes for the wiring

No codes showing after all. How did you diagnose to GP wiring being the fault?

Bashy · Jun 20th, 2021, 23:15

Accidentally, each time i removed the plugs or changed them whilst trying to diagnose, I found that the issue resolved itself, either by some or all of it.
All of my connectors to the plugs are broken too.

Thassos · Jun 21st, 2021, 07:29

I would def think glowplugs.. they are used not just for frosty morning startups, bosch duratherm, fairly cheap to obtain and pretty easy to replace, you just need a long reach 8mm socket, dont go mad with tightening torque... the sockets def fall apart with the plastic ageing, i have a good fix for that if youre interested, the euro 4 diagnostics reports individual fault codes for each glowplug which is fairly clever , resistance should be only around 1 ohm each to chassis/engine block.

Jun 13th, 2021, 14:18	#1
skye740 VOC Member Last Online: May 1st, 2023 20:08 Join Date: Jun 2006 Location: Isle of Skye View Photos By: skye740	D5 rough idle when cold Hello all. My D5 has developed a lumpy idle on starting from cold only, it doesn't show on rev counter so its only slight, but after having lived with the car for a long time, I know how it should sound, and once it's warm after driving its sounds as it should. It also momentarily flashes on the dim screen no oil pressure on 1st start but I'm talking for a split second, where should I be looking for anything specific to start with? It's due another 6000 mile oil change in a few hundred miles but for its mileage it barely uses any between changes. TIA __________________ Current:- 05' V70 D5 SE 221220 miles 01' Landy Discovery 2 Td5 77000miles (my new love(shhhh) Previous:- 97' V70 SE TDI 244348 Miles: 89' 745 B230k LPG conv 307260m: 90' 745 B200f 164786m :89' 440 turbo 135432m VOC 23035 Last edited by skye740; Jun 13th, 2021 at 15:27.

Jun 14th, 2021, 02:05	#4
Bashy Aged Member Last Online: Feb 20th, 2024 09:47 Join Date: Nov 2000 Location: Weeting	I too had/have this issue, and its deffo glow plug wiring for me, might not always show any codes for the wiring __________________ Regards, Bashy MY07 (56 plate) V70 Geartronic 2.4 D5 185bhp 173k, 17", full leather, an auto-dimming mirror and auto wipers are the best it can do - I have added (poorly) limo black, rear camera and parking sensors

Jun 20th, 2021, 23:15	#6
Bashy Aged Member Last Online: Feb 20th, 2024 09:47 Join Date: Nov 2000 Location: Weeting	Accidentally, each time i removed the plugs or changed them whilst trying to diagnose, I found that the issue resolved itself, either by some or all of it. All of my connectors to the plugs are broken too. __________________ Regards, Bashy MY07 (56 plate) V70 Geartronic 2.4 D5 185bhp 173k, 17", full leather, an auto-dimming mirror and auto wipers are the best it can do - I have added (poorly) limo black, rear camera and parking sensors

Jun 21st, 2021, 07:29	#7
Thassos GoldMember Last Online: Apr 25th, 2024 22:46 Join Date: Jul 2010 Location: Kent, UK	gp I would def think glowplugs.. they are used not just for frosty morning startups, bosch duratherm, fairly cheap to obtain and pretty easy to replace, you just need a long reach 8mm socket, dont go mad with tightening torque... the sockets def fall apart with the plastic ageing, i have a good fix for that if youre interested, the euro 4 diagnostics reports individual fault codes for each glowplug which is fairly clever , resistance should be only around 1 ohm each to chassis/engine block.

Jun 13th, 2021, 15:38	#2
Georgeandkira Premier Member Last Online: Apr 27th, 2024 13:23 Join Date: Feb 2009 Location: Hackensack	We don't have the diesel engines in No. America so I'm "cross-guessing". The oil pick up tube O-rings cracking with age has come up with the petrol engines. Maybe the diesels have the same setup and maintenance needs? The oil filter crowd would mention the effectiveness / condition of the ADBV (Anti Drain Back Valve). Do the diesel filters have this? I can tell you from experience (again, all petrol) that ADBVs' operation range from perfect to non-existent. A slight stumble in cold idling might be addressable using a known good injector cleaner. Two strong tankfuls. It'd be a cheap shot in the dark. If your engine has the "mixing pipe (?)" which fills with black goo, maybe it's choking your idle air supply? How many miles are on your car?

Jun 13th, 2021, 18:49	#3
Wgl2020 Member Last Online: Jan 21st, 2023 17:15 Join Date: Aug 2020 Location: Ormskirk	Have you scanned for any fault codes? Glow plugs is a possibility.

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