Lumpy Start When Cold - Not Glow Plugs

V70Driver76 · May 16th, 2018, 22:40

So, here we go, next challenge team!

2008, Mk 3 D5. Approx. 100k miles.

When starting from cold, lumpy and when very cold reluctant bit still goes. Once warm, no noticeable issues.

All glow plugs replaced and symptoms did not change one bit.

So, any common faults?

I haven't tried injector cleaner yet - any success stories and recommendations as to which one to use?

Thanks in advance.

Waynedance · May 17th, 2018, 00:06

Do a leak off test?

cheshired5 · May 17th, 2018, 00:16

Quote:

Originally Posted by V70Driver76

When starting from cold, lumpy and when very cold reluctant bit still goes. Once warm, no noticeable issues.

When was the fuel filter last changed?
When was the oil last changed and what spec and viscosity oil did you use?

V70Driver76 · May 17th, 2018, 06:10

Fuel filter done about 10 months ago as was oil and air filter. Using SHELJ Helix 0w-30 as specified.

V70Driver76 · May 18th, 2018, 07:27

Going to run some Forté through it next week and see how that goes.

Not done a leak off test, I guess that will be next.

Laird Scooby · May 18th, 2018, 09:02

What colour is the exhaust smoke when it's cold? Is there more of it than normal (ie hot)? There will be some steam when cold as it burns off condensation in the exhaust etc so please ignore this bit and concentrate on the smoke.

Also what does the engine sound like? Is it "extra clattery" above what it used to be when cold or is there a sharp knocking noise?

Was it a gradual onset or did it happen overnight?

Model flyer · May 18th, 2018, 10:18

My P2 D5 was occasionally lumpy on start up . It was the hydraulic valve adjuster letting by while standing overnight. The lumpy-ness was accompanied by a tappet rattle for a few seconds then all was ok . As it had done 150k + I started using 10w-30 oil and it was fine from then on . One thing about that engine is that the oil stayed very clean , not the usual black diesel soup. I used to keep some back for use in a lawn mower . Positive re-cycling

David R Webster · May 20th, 2018, 06:16

Hi. My car is a 08 xc70. We have had it 8 years and it does exactly the same thing as yours. We have the glow plugs checked and they are all okay. Never got to the bottom of what it is but it run no problem once it is running. It does irritate me why it does it.

V70Driver76 · May 20th, 2018, 07:10

Thanks David. I suspect it’s the injectors but can’t be sure without replacing them or checking them at a diesel specialist. Have you looked into this?

V70Driver76 · May 20th, 2018, 07:11

I has your always done it?

May 16th, 2018, 22:40	#1
V70Driver76 Junior Member Last Online: May 23rd, 2021 14:47 Join Date: Jul 2017 Location: Grantham	Lumpy Start When Cold - Not Glow Plugs So, here we go, next challenge team! 2008, Mk 3 D5. Approx. 100k miles. When starting from cold, lumpy and when very cold reluctant bit still goes. Once warm, no noticeable issues. All glow plugs replaced and symptoms did not change one bit. So, any common faults? I haven't tried injector cleaner yet - any success stories and recommendations as to which one to use? Thanks in advance.

May 17th, 2018, 00:06	#2
Waynedance Senior Member Last Online: Mar 15th, 2021 22:31 Join Date: Jun 2017 Location: Nuneaton	Do a leak off test? __________________ S80 P3 SE LUX D5 Auto

May 18th, 2018, 09:02	#6
Laird Scooby Premier Member Last Online: Today 08:43 Join Date: May 2012 Location: Lakenheath	What colour is the exhaust smoke when it's cold? Is there more of it than normal (ie hot)? There will be some steam when cold as it burns off condensation in the exhaust etc so please ignore this bit and concentrate on the smoke. Also what does the engine sound like? Is it "extra clattery" above what it used to be when cold or is there a sharp knocking noise? Was it a gradual onset or did it happen overnight? __________________ Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........

May 18th, 2018, 10:18	#7
Model flyer Master Member Last Online: Dec 15th, 2023 18:46 Join Date: Jan 2006 Location: Kent,pothole capital of UK.	My P2 D5 was occasionally lumpy on start up . It was the hydraulic valve adjuster letting by while standing overnight. The lumpy-ness was accompanied by a tappet rattle for a few seconds then all was ok . As it had done 150k + I started using 10w-30 oil and it was fine from then on . One thing about that engine is that the oil stayed very clean , not the usual black diesel soup. I used to keep some back for use in a lawn mower . Positive re-cycling __________________ The secret of flight is to aim at the ground and miss ! Previous Volvos 740 GLE . V40 CD ,V70 2.4 SE LPT.V70 D5 P2. V70 D5 Se Lux P3. Current Jaguar XF Sportbrake but still like Volvos

May 17th, 2018, 06:10	#4
V70Driver76 Junior Member Last Online: May 23rd, 2021 14:47 Join Date: Jul 2017 Location: Grantham	Fuel filter done about 10 months ago as was oil and air filter. Using SHELJ Helix 0w-30 as specified.

May 18th, 2018, 07:27	#5
V70Driver76 Junior Member Last Online: May 23rd, 2021 14:47 Join Date: Jul 2017 Location: Grantham	Going to run some Forté through it next week and see how that goes. Not done a leak off test, I guess that will be next.

May 20th, 2018, 06:16	#8
David R Webster New Member Last Online: Apr 12th, 2024 20:42 Join Date: Nov 2010 Location: Sheffield	Hi. My car is a 08 xc70. We have had it 8 years and it does exactly the same thing as yours. We have the glow plugs checked and they are all okay. Never got to the bottom of what it is but it run no problem once it is running. It does irritate me why it does it.

May 20th, 2018, 07:10	#9
V70Driver76 Junior Member Last Online: May 23rd, 2021 14:47 Join Date: Jul 2017 Location: Grantham	Thanks David. I suspect it’s the injectors but can’t be sure without replacing them or checking them at a diesel specialist. Have you looked into this?

May 20th, 2018, 07:11	#10
V70Driver76 Junior Member Last Online: May 23rd, 2021 14:47 Join Date: Jul 2017 Location: Grantham	I has your always done it?

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