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  #1  
Old 10-23-2004, 01:55 PM
Ta ra ra boom de ay
 
Join Date: Jun 2004
Location: Pittsburgh
Posts: 1,915
plug question

I am getting ready to put in new plugs & wires and I notice Advanced Auto Parts gave me platinum BOSCH HR9DPX plugs instead of old regulars (H 7,8,9 DC/DCO).
Guess I am just a little nervous could this be bad for my engine (M103.983)?

Any other tips?
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-Marty

1986 300E 220,000 miles+ transmission impossible
(Now waiting under a bridge in order to become one)

Reading your M103 duty cycle:
http://www.peachparts.com/shopforum/831799-post13.html
http://www.peachparts.com/shopforum/831807-post14.html
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  #2  
Old 10-23-2004, 02:25 PM
Ta ra ra boom de ay
 
Join Date: Jun 2004
Location: Pittsburgh
Posts: 1,915
Engine's almost cool, any takers?
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-Marty

1986 300E 220,000 miles+ transmission impossible
(Now waiting under a bridge in order to become one)

Reading your M103 duty cycle:
http://www.peachparts.com/shopforum/831799-post13.html
http://www.peachparts.com/shopforum/831807-post14.html
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  #3  
Old 10-23-2004, 02:53 PM
Ta ra ra boom de ay
 
Join Date: Jun 2004
Location: Pittsburgh
Posts: 1,915
Thumbs up

Think I found it here

Quote:
Quote:
Originally posted by pesuazo
Go back to copper bosch copper sparkplugs. And take it from there.


The issue is not "copper versus platinum", but resistor versus non-resistor. About the only reasonably available OE type non-resistor plugs are Bosch Supers, which are available in both resistor and non-resistor versions. Make sure you get the non-resistor version specified in the owner's manual, which should be H9DC. Don't buy HR9DC. The "R" indicates a resistor type plug, and almost all other comparable plugs, including popular "platinum" replacements such Bosch Platinums, are resistor type.

Resistor type plugs may cause increased idle roughness and emissions, but the evidence is mostly anecdotal.

Duke
Looks like I have to heat her again up and go get replacements.

P.S. Nothing like a good conversation with yourself.
__________________
-Marty

1986 300E 220,000 miles+ transmission impossible
(Now waiting under a bridge in order to become one)

Reading your M103 duty cycle:
http://www.peachparts.com/shopforum/831799-post13.html
http://www.peachparts.com/shopforum/831807-post14.html

Last edited by A264172; 10-23-2004 at 02:56 PM. Reason: addition
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  #4  
Old 10-23-2004, 03:57 PM
Registered User
 
Join Date: Sep 2004
Location: Seattle
Posts: 1,971
On the one hand, I agree with all 3 of you... On the other hand, there was a thread recently where it was basically stated that platinum plugs are cra*. This thread was called "STARMARK & INDY GARAGE". So you might check that one out.

Mike
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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra
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  #5  
Old 10-23-2004, 04:07 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
I've put both Bosch Platimun plus 4s and Champion copper cores in the TE, no difference.

My friend the mechanic only uses platinum plugs these days, as they are all resistor plugs originally.

If you have idle problems, switch back to the coppers, but otherwise the platinums are fine, I use them in everything with no problems.

The only time you get trouble is if you have too high a resistance in the wires, ends, and plugs combined, and most replacement wire sets these days aren't resistor (or have the correct low resistance ends).


Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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  #6  
Old 10-23-2004, 05:59 PM
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Join Date: Mar 2003
Location: Southern California
Posts: 2,293
My suggestion is to buy a dozen Bosch Super H9DCs from Fastlane. One for now and a spare set for later. They are less than $2 each and should be good for 30K miles.

The OE type "heavy duty" electode (suffix "0" as in H9DC0) are more expensive, but not worth the higher price. The standard electrode H9DCs are just fine.

Duke
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