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Old 05-22-2002, 09:53 AM
DMarble DMarble is offline
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Join Date: Apr 2000
Location: Location:Las Cruces NM. USA
Posts: 76
Which bosch spark plugs

I just took a set of platnium +4s out of my 300E and put in the correct H9DCO plugs and the intermittant rough idle seems to be gone. I did not realize my independant mech had put in the +4s
over two years ago and have suffered with the rough idle ever since.
88 300E 250K Sold
2000 C230K Totaled @104K
2003 ML320 140K Sold
2009 E350 4Matic Sport 46K Sold
2011 ML350 60K Sold
2014 GLK350 40k
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