This is a reminder to use the forum to help each other, rather than private messages. Private messages get seen by the recipient, while posts are freely readable by the millions of Volvo owners across the globe. Thanks much!

Welcome to the world's #1 Volvo forum!

Volvo Fixes & Advice since 2001.

Login Register

Spark plugs - what do u think

A mid-size luxury crossover SUV, the Volvo XC90 made its debut in 2002 at the Detroit Motor Show. Recognized for its safety, practicality, and comfort, the XC90 is a popular vehicle around the world. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
Post Reply
User avatar
toolpusher
Posts: 48
Joined: Tue Dec 24, 2019 6:22 am
Year and Model: 2007 XC90
Location: PA
Has thanked: 3 times
Been thanked: 3 times

Spark plugs - what do u think

Post by toolpusher »

Spark plugs replaced from 2010 3.2 at 111k miles (not the one from the catalytic converter thread). To the experts: what do the spark plugs tell me in terms if the engine?
Thank you!
Attachments
4264F7FE-D0AD-4E9F-BB1B-01BD20333F1A.jpeg
5EDCF5B5-4D19-49A6-A6C2-1E9C57C22407.jpeg
693931EA-BD42-41C5-AF7B-140F96E216F0.jpeg

User avatar
pgill
Posts: 472
Joined: Mon Aug 27, 2018 5:42 pm
Year and Model: 2010 S80, 2008 LR2
Location: California
Has thanked: 52 times
Been thanked: 55 times

Post by pgill »

If you are having to add oil between changes then I would recommend a new PCV.

They should look like this (except for number 2 which has a problem)
plugs.jpg
plugs.jpg (145.99 KiB) Viewed 263 times

The way the PCV system routes the Vapors (and oil if its broken) is in a channel that connects all 6 intake ports

Start 6 - 5 - 4 - 3 - 2 - 1 finish

Because of this plug #6, #5 will be worse than plug #1, #2 (and I think that you have that)

If the plugs have been in there for a long time you could drive with the new plugs for a month and check #6 before replacing the PCV

Take Care

Paul

pbierre
Posts: 47
Joined: Sun Mar 24, 2019 9:05 am
Year and Model: T6 XC70s: '13 & '15
Location: Pleasanton CA
Been thanked: 7 times

Post by pbierre »

These plugs look the same as the set I pulled out of my 2013 XC70 at 110K miles. The gaps are a little enlarged, due to the positive electrode tip wearing down. If there's anything besides normal wear and tear, it doesn't show in the photos.

Over the course of 50K miles, a spark plug will fire 200,000,000 times.

User avatar
SuperHerman
Posts: 1736
Joined: Mon Dec 01, 2014 1:28 pm
Year and Model: 2004 & 2016 XC90
Location: Minnesota
Been thanked: 190 times

Post by SuperHerman »

All pictured spark plugs look to be equal visually, meaning your cylinders and related are consistent. They have excess oil/coke deposits. This could be b/c of short driving distances, PCV system, or worn rings. I bet on short driving distances. So they look normal for short driving distance usage, but as you can see the results are not optimum. It is not just the spark plugs.

User avatar
pgill
Posts: 472
Joined: Mon Aug 27, 2018 5:42 pm
Year and Model: 2010 S80, 2008 LR2
Location: California
Has thanked: 52 times
Been thanked: 55 times

Post by pgill »

pbierre wrote: Sun May 09, 2021 8:14 pm These plugs look the same as the set I pulled out of my 2013 XC70 at 110K miles. The gaps are a little enlarged, due to the positive electrode tip wearing down. If there's anything besides normal wear and tear, it doesn't show in the photos.

Over the course of 50K miles, a spark plug will fire 200,000,000 times.
Those plugs look original FoMoCo

I change mine at 50,000 mile intervals on my 3.2s

The replacements that you bought are the wat to go.

Note: the center wire on the Iridium TT 4704 is slightly thinner than the Stock Iridium plugs 3421 that you removed

Smaller wire advantages

+ Less work for the coil to create a spark

+ Less likely for the spark to quench (this is important for catalyst efficiency checking)

- Smaller wire will wear out faster

Did I mention a 50,000 mile service interval


Image


Good luck

Paul

User avatar
pgill
Posts: 472
Joined: Mon Aug 27, 2018 5:42 pm
Year and Model: 2010 S80, 2008 LR2
Location: California
Has thanked: 52 times
Been thanked: 55 times

Post by pgill »

Toolpusher,

Based on your posts it looks like you have two 3.2s

I do as well.

Both of yours seem to have a sticking PCV Valve.

You can use the Land Rover part if you like

LR023777

The same part in a Volvo box cost almost 2X Volvo part number 31319642

Note: the 3.0T is different than the 3.2

A less expensive option is to just replace the diaphragm and cap (I tried to remove the cap on my LR2 and it cracked, but a new cap would solve this issue)

Some picture of my LR2

https://www.freel2.com/forum/topic32107.html

I think one of your 3.2s is consuming a lot of oil, if you don't have any leaks then the PCV should fix the oil consumption.


Good luck

let us know what you do and if it works

Paul

User avatar
toolpusher
Posts: 48
Joined: Tue Dec 24, 2019 6:22 am
Year and Model: 2007 XC90
Location: PA
Has thanked: 3 times
Been thanked: 3 times

Post by toolpusher »

Yes indeed, two 3.2s. One at 111k (this thread) and one at 147k (the oil burner). Next is thermostat and manifold gaskets on the 147k, and now I am adding PCV to the list :)

User avatar
pgill
Posts: 472
Joined: Mon Aug 27, 2018 5:42 pm
Year and Model: 2010 S80, 2008 LR2
Location: California
Has thanked: 52 times
Been thanked: 55 times

Post by pgill »

toolpusher wrote: Wed May 19, 2021 9:04 pm Yes indeed, two 3.2s. One at 111k (this thread) and one at 147k (the oil burner). Next is thermostat and manifold gaskets on the 147k, and now I am adding PCV to the list :)
Nice!!!

I would change the intake manifold gasket and clean the throttle body when you change the thermostat.

But I wouldn't change the exhaust gasket unless you have a leak or a check engine light.

Good luck

Paul

User avatar
toolpusher
Posts: 48
Joined: Tue Dec 24, 2019 6:22 am
Year and Model: 2007 XC90
Location: PA
Has thanked: 3 times
Been thanked: 3 times

Post by toolpusher »

pgill wrote: Thu May 20, 2021 11:50 am I would change the intake manifold gasket and clean the throttle body when you change the thermostat.
Thank you! Do you recommend pulling the throttle body of and then - probably - replace the gasket, or leave the throttle body on the manifold and clean it just from the outside?

User avatar
pgill
Posts: 472
Joined: Mon Aug 27, 2018 5:42 pm
Year and Model: 2010 S80, 2008 LR2
Location: California
Has thanked: 52 times
Been thanked: 55 times

Post by pgill »

toolpusher wrote: Fri May 21, 2021 10:29 am Thank you! Do you recommend pulling the throttle body of and then - probably - replace the gasket, or leave the throttle body on the manifold and clean it just from the outside?
I didn't change the throttle body gasket on mine, I just cleaned it and reused it.

Note: the gasket is compressed by the throttle body and as long as it is compliant then you can reuse it.

The Land Rover part number is LR001462 (throttle body gasket)

Its a little expensive $24 https://www.oemdiscountcarparts.com/oem ... t-lr001462

I do recommend that you change the small gaskets Qty 6

LR001454 (I replace these every time I remove the manifold)

I use the Victor Reinz part $2.35 each https://www.rmeuropean.com/Products/LR001454-MFG17.aspx

The price is low but the quality is excellent for these parts.

Note: these small gaskets by the cylinder head will be contaminated by oil if your PCV is not functioning and they will lose their flexibility and their ability to seal. Which is why I always replace mine.



If you want the small gasket in a Volvo box then FCP sells them for $17 each https://www.fcpeuro.com/Volvo-parts/S80 ... b=5&d=3597

List price is about $25 each


Get the Victor Reinz parts you won't be disappointed.


Thanks

Paul

Post Reply