sami

I need to change the spark plugs to my E320 2004 any pointers on how ? how easy or how hard is to do the job? What type of plugs do I need and how many is it 6 or 12 plugs? any detailed help will be greatly appreciated.

Thanks a lot

Untertürkheim

You will need 12 plugs, anti-seize, electrical contact cleaner, electrical contact grease, and a spark plug wire puller.

The fitment chart will be listed here: http://www.boschautoparts.com/Resour...clePartFinder/

You can use the standard plugs, +2, +4, or Ir Fusion (best).

Make sure the engine is cold. Pull wires off at the base of the boots using the wire pullers.
Clean out the wire boots with contact cleaner and put anti-seize on the plugs, torque to correct spec. Put electical contact grease inside wire boot, reattach to plug.

MBtech1

Its fairly easy. Its just pretty tight in the back so that can make it hard. Also the spark plug wires can be hard to pop off sometimes. You will need 12 plugs, 2 per cylinder. You will need a torx socket for the bolts in the coil packs.

lkchris

No antiseize--you'll not get a correct torque reading using it and will increase risk of thread stripping. It's not recommended by Bosch or Mercedes.

Forget Bosch +2 or +4 Platinums--these are K-mart specials only sold in the USA and not suitable for use in German cars. The fact they're cheaper than OE plugs is a clue.

Install the plugs recommended by Mercedes and listed in your owner's manual.

If you're doing this without owning the W211 Service DVD or WIS procedures downloaded from Startekinfo (same thing) you're not prepared to do it.

Untertürkheim

[QUOTE=lkchris;2736625]Forget Bosch +2 or +4 Platinums--these are K-mart specials only sold in the USA and not suitable for use in German cars. The fact they're cheaper than OE plugs is a clue.[QUOTE]

This is not true, the 4 gound plugs are sold in Germany. I do not know who told you otherwise, additionally, they are more expensive. The single ground OE Bosch platinum plugs are cheaper. I have switched several cars to +4 plugs in the past and now to Ir Fusion (also 4 gound, but iridium) plugs. They are an improvement over the original single ground.

vettdvr

[QUOTE=Untertürkheim;2736558]The fitment chart will be listed here: http://www.boschautoparts.com/Resour...clePartFinder/

QUOTE]


Interesting,, when I select E500 it does not give a replacement plug for the 2003

lkchris

[QUOTE=Untertürkheim;2736674][QUOTE=lkchris;2736625]Forget Bosch +2 or +4 Platinums--these are K-mart specials only sold in the USA and not suitable for use in German cars. The fact they're cheaper than OE plugs is a clue.Check again regarding the multi plugs--ONLY in the USA are these identified as platinum.

jimmydagreek

+1 There has been lots of talk about + anything plugs and most users have cautioned against them. I put OEM Bosch Plats. in my previous E55 as recommended by most if not all of the AMG owners in this forum and others including the AMG owners club.

I would recommend the wire puller as well and NO antiseize, you don't need it and it could cause problems. Be careful pulling the wires off because depending on how many miles you have (you know the stock plugs go to 100K but not recommended) the wires could really be stuck in there. You could damage the wires if you don't pull them out correctly by the boots so be careful. Good luck!

Untertürkheim

[QUOTE=vettdvr;2736925]It worked for me, did you select year first, then make and model?

Untertürkheim

According the the bosch.de website, they do not sell any platinum spark plugs in Germany (although, I never said they did, only that they sold +4 4 gound plugs), but they do sell a four-ground "+4" plug.

vettdvr

So,, other than buying from MB dealer is there a recommendation from this list

Part Number Description Where To Buy
4418 PLATINUM+4 Do not gap. Gap is not adjustable.
4301 PLATINUM+2 Do not gap. Gap is not adjustable.
4501 PLATINUM IR FUSION Do not gap. Gap is not adjustable.
7422 OEPLUG GAP=0.040"

Other than don't use the + plugs. From this list

I would see the 7422 as the correct plug and possibly the 4501. I run the Bosch IR plug in my vet and it runs acceptable. However I do change them at about 40,000 miles due to driving a lot of red line on the track.

What I don't understand is the anti-seize? I normally use this on all aluminum head engines installing plugs and never an issue. Why is this different on a MB from the engineering viewpoint. Is it the casting? Plug? I just dont understand why we would not use anti-seize made exclusively for this application.?

georgedaman

I went with the PLATINUM+2 and the electrical contact grease.
From my previous experiences , i never felt the difference between the +2 and +4 other then the price..

gnma

Assuming sami will DIY, and that he has a torque wrench, can anyone ck. the manual and see what the torque spec. should be to tighten the plugs for his car? sami, as stated above, u should have the service manual. But if u can get the torque spec. coupled with the advice above, you should be able to DIY. PS, u don't NEED the torque spec. but that's how I work, and u don't want to over/under tighten the plugs. Just my .02. Good luck!

vettdvr

[QUOTE=lkchris;2736625]No antiseize--you'll not get a correct torque reading using it and will increase risk of thread stripping. It's not recommended by Bosch or Mercedes.
QUOTE]

I am still a bit confused here with no antiseize? AMSE specs for tightening fasteners/bolts etc require clean lubed threads for proper torque to reduce thread friction and give an accurate reading. I would expect antiseize to preform this function on sparkplugs. But no antiseize or lube on the plug would result in high sliding thread friction and not appear to give proper torque reading. I accept you can install them without antiseize or any lubricant, but don't understand the detail mechanism for this to work.\

Also why is a torq tool needed to remove the coil packs. Do they have to be removed to change plugs. ??

I haven't changed my plugs but will in the next year or so. So as it has been said, " the is in the details".

ohlord

for plugs is pretty much the same as on the w210 model.m112 and m113 engine
diy on benzworld.org w210 diy section.
plugs are listed in your manual.

no anti seize the plugs oem bosch or ngk all come factory plated threads so they don't seize and you can dry torque them properly if you are not confident in your ability to hand torque them the old school way.
You need the torx bits(sold at almost any good auto chain for 7 bucks a set) to remove the coil packs that allow access to the plugs.
keep the wires on the coils by using the proper metal boot removal tool"(I sell for $28 delivered)it pops off the boots easily with no damage to the wires.
plug F8 dpp 332u bosch or ngk 7090 or ngk 4292 all single side electrode plugs mercedes does not recommend multi tip plugs for the m112 or m113 engines.Nor no matter how much the above argues for their merit do they provide any benefit at all except to lighten your walletand on the down side can adversely affect the proper ignition.
18.5-22 lb ft or 25-30nm torque.pg.383 in your 2004 owners manual
if you use the 17mm offset plug boot removal tool you will save time,wires and you will have no need for dielectric grease when you use the same tool to properly pop the metal boots back on again.
If you need any further tips pm me
ohlord
if you have over 60 k miles it is time to get your trans fluid and filter changed out and I have the special; dipstick for sale for $40 delivered if you need that also.