Spark Plug Replacement - ML320 - Page 2 - PeachParts Mercedes-Benz Forum

tt33 · #16 11-07-2008, 11:37 AM

Quote:

Originally Posted by sdanville

Well Ron,,
Tonight I installed the Stock Bosch Plugs.
Ive had a rough idle and never felt the best about the Bosch platinum 2's.
So I only ran them 5,000 miles. I think my mass air flow problems may have made them foul early.
At least they were only $4 per cyl each so I only blew $24 plus tax.
2/21/07 update. New stock $100+ plugs still did not take miss out of idle.
2-1-8 UPDATE : I replaced 3 of the ignition wires where my records show I picked up some misfires based on my code reader. I am down to a rare occational mis fire. I sat in my brother in laws 2007 Suburban and it idled worse than my 1999 with 130,000 miles. I decided my rough idle is so small I can ignore it.

I called the MBZ dealership today and they highly NOT recommended to use Bosch Platinum 2 or 4 spark plugs. Looks like your experience was also pretty bad with Bosch. Do you recomment any other brand for ML320?

sdanville · #17 11-07-2008, 12:10 PM

Nope. Just Origional Equiptment for me - regarding plugs.

tt33 · #18 11-11-2008, 11:13 AM

Quote:

Originally Posted by sdanville

Nope. Just Origional Equiptment for me - regarding plugs.

Could you please tell me if this is the OEM part:
Bosch Spark Plug Part Number: 4501

http://tinyurl.com/6pyj5r

I do not see this part number in the MBZ manual. Thanks!

kfriceman · #19 11-30-2008, 06:53 PM

The dealer wanted $500 to the job; it took me 2.5 hours at a leisure pace and about $200 in parts. $70 of the parts was for the combinaton open/closed end 45 degree offset 17mm wrench; had to special order that one and it made easy work of the plug boot removal just as told on this forum. I found no reason to remove the tire or inner well, it was a pretty straight forward job.

The sage advice I received from this sight was to wear gloves as the stainless steel heat sheild will cut your hands to shreds....very, very, very good advice...the damage to the gloves told the story.

-Kevin