How many spark plugs are in your car ??? :roll:

 

I believe there are 18 valves in the engine as there are 6 cylinders. I expect each cylinder to have at least one spark plug.

Mercedes are slow to change to 4-valves per cylinder engines and I am only aware of Alpha Romeo to have two spark plugs per cylinder on their two valve per cylinder engines.

The fact you have asked the question make me wonder if a 'spark plug' could be used for other duties in the XF. Can't think of anything myself, and I don't carry any spares with me.

 

I've got the service manual but it doesn't really state how many.

One thing I did find though was the firing order. The firing order is: 1-4-3-6-2-5 so this would suggest there are 6 of them right?

I have the service manual in .pdf format. It is 160MB and my web space is only 100MB so if someone can point me to a location to upload it to I would be more than happy to do this for you.

 

Saldous,

Can you burn the Service Manual to CD and send it to me?

Happy to cover any of your costs.

 

It's a twin spark, similar to alfa. 12 is your answer

 

2 plugs per cylinder I found on a Merc SLK 320 site just now.

 

Now why don't they advertise that fact? It is a USP on Alfa's.

 

Just what we need..higher maintenance costs. It'll probably cost $120 just to buy the new plugs themselves, then labor on top of that (if we choose to have a shop change the plugs). It's a good thing they last a while.

 

Twin plugs should improve the combustion of the air/fuel mixture, so you should get MORE POWER than with a single plug cyclinder. Details are readily available on any Alfa site.

:idea: I am beginning to wonder if changing the spark plugs to performance specifications will increase power further.

Has anyone tried different specification plugs :?:

 

I have 36... of course most of them are in the trunk. I have to remember to get them out of there when I get home.

 

Congratulations r.robertson wins the prize... :lol: I fouled a plug last week and went to replace them with platiinum tip Bosch and happily ran off to buy six. Returned home and was startled to realize I was 50% short. And yes, it was $96.00 usd to replace all 12

 

WHY did the plugs foul? and couldn' that be a warranty item?

Was the oem plugs platinum? if yes, isn't platinum plugs good for 100,000 miles. And most normal 1st gen Xfire owners wouldn't have to pay for that maintenance item (since they will sell the car in 3-4 years).

 

I race the car and run very high octane (100) fuel in the car at the track. After a recent run I was feeling the car missing at idle. I took it to the dealer to have them put it on their Star Tech computer to see what was up... The car looked perfect on the diagnostic computer but was still "Missing" at idle. I figured I had a fouled plug and sure enough I pulled the plugs when I got home and noticed that one was extremely carbon'd-up.

I guess I could have had the dealer replace the plugs but since I have mod'd the car so much and wanted top-of-the-line plugs, I figured I would do it myself. The standard plugs are Bosch OEM but not dual tip (split tip) platinum.

So $96.00 and an hour of work, no more "missing" at idle and now I know we have 12 plugs...

 

Are you familiar with Usenet (internet newsgroups)? If so, and you are also familiar with splitting a large file using WinRAR, I suggest 5MB chunks posted to alt.binaries.misc.

Is this a UK specific (i.e. covers RHD only) service manual?

 

So! What my prize??

 

Many thanks to Adfrad who managed to get the .pdf file down to 80MB for me and then used WinRaR to get it down to about 35MB !!! Amazing considering it was originally 165MB. If you want it go here:

http://homepages.nildram.co.uk/~sald...ice_manual.rar

I don't think the manual is different between US / UK. I just paid for it off eBay and it was a copied CD so I don't know.

 

I'll send you my old plugs... PS: 11 of them are still good... LOL

 

HDDP,

Did you need to replace all 12 plugs, or could you have simply replaced the duff one?

Nice prize though.