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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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Spark PlugsViews : 1969 Replies : 20Users Viewing This Thread : |
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Nov 15th, 2019, 22:50 | #1 |
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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 |
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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
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Nov 17th, 2019, 10:34 | #3 |
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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.
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Nov 17th, 2019, 10:38 | #4 | |
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Nov 17th, 2019, 16:43 | #5 |
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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
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Nov 29th, 2019, 16:21 | #6 |
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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 |
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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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Nov 29th, 2019, 19:56 | #8 |
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I've never had issues with NGK plugs
Back to the original post how did you get on with resolving the problem? |
Nov 30th, 2019, 04:28 | #9 |
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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 .
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Nov 30th, 2019, 10:21 | #10 |
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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
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