Spark Plugs

Mkengineering · Nov 15th, 2019, 22:50

Right i need someone to shed some light here for me?

My brother has a volvo V70 T5 running high boost. Alot of work has gone into it to make some serious power. Recently we found that it was misfiring a fair bit. Found that cylinder 3 and 4 wasnt firing.

He was running NGK Grade 8 plugs and to be fair it ran very strong with no issues at all. So moving forward and getting various advice for other volvo owners they all said "Get some proper Volvo Plugs will run much better than thos NGK ****e"

So stupidy we listed! Popped into Volvo and order some plugs installed them to find its running worse than ever! Did a quick diagnostic aswell with it now showing Cylinder 1 and 2 not wokring!!

So someone tell me what on earth went wrong? I thought VOLVO Plugs were the bees knees?

We have ordered some Ngk Grade 8s again thou

Luxobarge · Nov 16th, 2019, 08:36

What year is the car? If it's a late one it will have an ME7 engine with individual coil packs for each cylinder, if so then these will be favourite for a misfire. Personally I'd replace them all, as if one or two are misbehaving the others will probably not be far behind. Especially on a high performance setup.

If it's the earlier car with conventional plug leads and distributor, then replace the dizzy cap and rotor for a decent quality one and check the leads. Good way to do this is to take the spark plug cover off and run the car in the dark. If you can see any stray sparks then look at the source and sort that first.

HTH

ASt85 · Nov 17th, 2019, 10:34

It is also worth checking the integrity of the coil connector blades; if they are even slightly loose, you will get misfires.

Check also the continuity of the wires themselves as they can break inside the insulating plastic where the loom passes under/through a rubber grommet on the right hand end of the black plastic coil cover. There is so little slack in the wiring that if the engine top engine stay is worn there is enough rotation of the engine to break the wires.

Clan · Nov 17th, 2019, 10:38

Quote:

Originally Posted by Mkengineering

Right i need someone to shed some light here for me?

My brother has a volvo V70 T5 running high boost. Alot of work has gone into it to make some serious power. Recently we found that it was misfiring a fair bit. Found that cylinder 3 and 4 wasnt firing.

He was running NGK Grade 8 plugs and to be fair it ran very strong with no issues at all. So moving forward and getting various advice for other volvo owners they all said "Get some proper Volvo Plugs will run much better than thos NGK ****e"

So stupidy we listed! Popped into Volvo and order some plugs installed them to find its running worse than ever! Did a quick diagnostic aswell with it now showing Cylinder 1 and 2 not wokring!!

So someone tell me what on earth went wrong? I thought VOLVO Plugs were the bees knees?

We have ordered some Ngk Grade 8s again thou

They are , as I have proved over the last 47 years ! Look elsewhere for your fault .

upv5 · Nov 17th, 2019, 16:43

If it is running high boost then close the plug gaps by 0.1 mm and try running again, you may have to do this a couple of times.
It was normal practice to reduce the spark gap to 0.6/0.7 mm ( from 1.0 mm ) on high boost Ford Cosworth engines. Volvo Turbo plugs are extremely good platinum plugs.

John

Mkengineering · Nov 29th, 2019, 16:21

Bit of a revival.

But I just changed some plugs and ignition leads on my own car.

And I'm yet again not impressed .Spent around 260 with my Volvo dealer and my car runs like a bag of ****.

Went and bought some ngk grade 7 iridium and its running alot smoother.

Dippydog · Nov 29th, 2019, 17:10

I've never had any problems with using NGK plugs,but then I've never had a car with a forced induction engine either.

classicswede · Nov 29th, 2019, 19:56

I've never had issues with NGK plugs

Back to the original post how did you get on with resolving the problem?

Mkengineering · Nov 30th, 2019, 04:28

Quote:

Originally Posted by classicswede

I've never had issues with NGK plugs

Back to the original post how did you get on with resolving the problem?

Thankfully resolved my brothers issue just by chucking out the Volvo plugs and installing some Denso plugs. However just found out that the boost solenoid has packed in so it's not boosting correctly .

HDAV · Nov 30th, 2019, 10:21

Quote:

Originally Posted by classicswede

I've never had issues with NGK plugs

Back to the original post how did you get on with resolving the problem?

I always thought NGK were top spec plugs in many applications the advise is to run NGK, high boost applications will need modified plugs depending on the levels of boost either different plugs or different gaps which may require upgraded coils. If the car has individual coil packs suggests new ones and get it on a dyno witch ecu monitoring as without it your probably ****ing in the wind trying to fix it

Nov 15th, 2019, 22:50	#1
Mkengineering Master Member Last Online: Sep 30th, 2023 03:45 Join Date: Mar 2019 Location: Heathrow	Spark Plugs Right i need someone to shed some light here for me? My brother has a volvo V70 T5 running high boost. Alot of work has gone into it to make some serious power. Recently we found that it was misfiring a fair bit. Found that cylinder 3 and 4 wasnt firing. He was running NGK Grade 8 plugs and to be fair it ran very strong with no issues at all. So moving forward and getting various advice for other volvo owners they all said "Get some proper Volvo Plugs will run much better than thos NGK ****e" So stupidy we listed! Popped into Volvo and order some plugs installed them to find its running worse than ever! Did a quick diagnostic aswell with it now showing Cylinder 1 and 2 not wokring!! So someone tell me what on earth went wrong? I thought VOLVO Plugs were the bees knees? We have ordered some Ngk Grade 8s again thou

Nov 16th, 2019, 08:36	#2
Luxobarge Premier Member Last Online: Yesterday 22:43 Join Date: Jan 2011 Location: Horne (Nr. Horley)	What year is the car? If it's a late one it will have an ME7 engine with individual coil packs for each cylinder, if so then these will be favourite for a misfire. Personally I'd replace them all, as if one or two are misbehaving the others will probably not be far behind. Especially on a high performance setup. If it's the earlier car with conventional plug leads and distributor, then replace the dizzy cap and rotor for a decent quality one and check the leads. Good way to do this is to take the spark plug cover off and run the car in the dark. If you can see any stray sparks then look at the source and sort that first. HTH __________________ Some people are like Slinkies, they serve no useful purpose but they still bring a smile to your face when you push them downstairs.

Nov 17th, 2019, 10:34	#3
ASt85 Premier Member Last Online: Apr 16th, 2024 14:11 Join Date: Aug 2010 Location: Walderslade....Kent	It is also worth checking the integrity of the coil connector blades; if they are even slightly loose, you will get misfires. Check also the continuity of the wires themselves as they can break inside the insulating plastic where the loom passes under/through a rubber grommet on the right hand end of the black plastic coil cover. There is so little slack in the wiring that if the engine top engine stay is worn there is enough rotation of the engine to break the wires. __________________ The saddest moment is when the one who gave you the best memories....becomes a MEMORY V70 SE 2004 2.3L T5 Geartronic, C70 2005 2.0T Automatic, Sold 2.4l 20 Valve Automatic Torslander Sold 854 GLT 20v Auto

Nov 17th, 2019, 16:43	#5
upv5 VOC Member Last Online: Apr 10th, 2024 12:33 Join Date: Dec 2003 Location: Grays	If it is running high boost then close the plug gaps by 0.1 mm and try running again, you may have to do this a couple of times. It was normal practice to reduce the spark gap to 0.6/0.7 mm ( from 1.0 mm ) on high boost Ford Cosworth engines. Volvo Turbo plugs are extremely good platinum plugs. John __________________ This is a Bike friendly Volvo-N.A.B.D. member 2000 V70R AWD - SWMBO 2017 XC60 D5 AWD --- Previous - 2009 V50 D5 SE LUX - 2000 V40 SE 2.0 - 1986 760 GLE 2.8

Nov 29th, 2019, 19:56	#8
classicswede Trader Volvo in my veins Last Online: Yesterday 22:24 Join Date: Dec 2004 Location: Anglesey	I've never had issues with NGK plugs Back to the original post how did you get on with resolving the problem? __________________ http://www.classicswede.org www.classicswede.co.uk

Nov 29th, 2019, 16:21	#6
Mkengineering Master Member Last Online: Sep 30th, 2023 03:45 Join Date: Mar 2019 Location: Heathrow	Bit of a revival. But I just changed some plugs and ignition leads on my own car. And I'm yet again not impressed .Spent around 260 with my Volvo dealer and my car runs like a bag of ****. Went and bought some ngk grade 7 iridium and its running alot smoother.

Nov 29th, 2019, 17:10	#7
Dippydog Premier Member Last Online: Yesterday 19:11 Join Date: Jun 2016 Location: S****horpe	I've never had any problems with using NGK plugs,but then I've never had a car with a forced induction engine either.

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