Figured I'd throw this out there since I'd like to change my plugs asap and nobody around here wants to carry the Boschs I desire. I figure they're copper and there's no resistor, so they'll due just fine. Anybody have any thoughts?

at least 30 years. when i tried other brands they were crap... well some were better than others but never as good as bosch.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

You asked . .. we answered ..
Now do what ever you want.

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1D00YU6RY1KZ18WD92&year=1993&make=MB&model=300-E-004&category=F&part=Spark+Plug
Notice they know not to even give you a choice ...
guess why....
..cuz they know 104.992 engines ONLY LIKE F8DC4s .. as they are not a conventional ignition system, they are a Waste Spark System.

Year and model?????

Most Mercedes REQUIRE non-resistor plugs for proper ignition system operation and using resistor plugs can cause idle roughness and high emissions, both due to misfires - maybe not when the plugs are new, but just wait a few thousand miles!

Go to Fastlane and order the correct Bosch spark plugs for your car. You'll have them next week, and you won't have to run all over town looking for them. Most auto parts stores DO NOT carry the proper Bosch non-resistor plugs for Mercedes and often cannot even order them.

Duke

yeah I figured nobody would have them. It's always, "we stock them we just don't stock them right now." Thanks for the input, I'll just go with the online order like I considered earlier. Maybe I'll just get the tune-up kit. Thanks again.

call Phil at Fastlane (see the banner at the top of merceedesshop home page); he will send the F8DC4 Bosch (assuming your engine is an M104) to you ASAP. They are about $2.00 +/- each.
regards,
Mark

You can always get Bosch Supers at any Foreign Auto parts store.

yes it is the 104 engine, there's a MB specialist about 6 miles from me that I'm going to swing by tomorrow and see if he has any plugs. Haven't talked to him quite sometime, but he slipped my mind in my rush to find the plugs. Thanks, Barrett Jackson is on SpeedChannel right now FYI.

You actually still have those in Florida? In California most of the independents are gone. About all we have left are NAPA and "MacParts".

The best way to buy Merc parts is from Phil at Fastlane, or the dealer as a last resort if you need it today and he has it in stock. I get Fastlane parts the next day via ground UPS since they have a warehouse in So Cal.

There's not much that can't wait a day.

Duke

For the M104 Engine the manual specify FDC0 not FDC4.
Only the dealer sels FDC0 and they are 1.85 a piece.
Also the FDC4 have a washer and FDC0 does not.
My engine runs a lot better with FDCO (is what manufacturer recommends)

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Radu Negru

Better check your manual and correct your post. The plug number you typed is missing the digit that represents the relative heat range.

Duke

You mean original F9DC0, ..and they have been superceded by F8DC4
[ 5 years ago ]

104 Eng
F8DC4 Super Copper [ Replaces F9DC0]
Gap .8mm . Torque 20/30Nm

This is absolutely true. The NGK resistor plugs I have in my car worked great for the first few thousand miles (even passed the emissions test last year with flying colors). A few thousand miles later I had to reduce the gap by 1/2 just to get it to run without stalling and stumbling at a light.

I have the correct H9DC0 plugs (M103) ordered from FastLane along with my new voltage regulator. The local Autozoo and O'Reilly only listed the Bosch Super and NGK plugs for my car. Didn't know anything about the H9DC0.

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The H9DC0 and H9DC ARE Bosch Super spark plugs, but parts stores usually only stock or can order the resistor version, HR9DC. the H9DC0 has a "heavy duty" electrode and replaced the H9DC as OE circa '86, but the H9DC is still approved by Mercedes.

Again, the issue is RESISTOR versus NON-RESISTOR, and there is no other line of readily available non-resistor plugs in the US other than the Bosch Super.

Duke

Thanks for the clarification.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
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75 W114 280