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#31
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Pete's opinion
Benz designed resistance into the wiring/terminals. The use of resistor plugs upsets the ignition equation and will result in suboptimal efficiency.
My solution, eliminate spark plugs altogether. |
#32
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Quote:
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
#33
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I run denso 5061 spark plugs,there are like the 3 groundstrap plugs bosch makes,that came with my car
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1999 w140, quit voting to old, and to old to fight, a god damned veteran |
#34
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Quote:
Quote:
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
#35
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How are you going to light the fuel? With a match?
Someone said that it's best to rely on your MB dealer selling you the right plugs. NO! My MB dealer sold me 2 lots of resistor plugs for a total of 200 Euro before I took the matter in hand and put in non-resistor Bosch plugs. Result: more even idling and eliminated misfire. This on a 1991 M104.980 engine. I now get Beru or NGK for about 2 Euro each and all is well. MB in my neck of the woods (France) can be utterly clueless on older car issues. It is most important that all HT components on my engine (and similar) are of the highest quality and in perfect condition. For me, this means MB for everything apart from plugs. Failing that, Beru or Bosch caps and rotors. NOTHING else, in my opinion. The best to all. RayH |
#36
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You can always find the NR plugs @ the dealer...if you joing MBCA you get wholesale pricing. No fuss/no muss!
Or, order a bunch off of parts.com and request a shipping quote to keep it reasonable! Jonathan
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Blue Ridge Mercedes Jonathan Hodgman http://www.blueridgemb.com/ Enthusiast Service, Restoration & Tuning. Follow Us on Facebook! Located in the Atlanta area Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines. Mercedes Repair Atlanta |
#37
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What is all this $4-5 plug bull**** I keep hearing? You can get Bosch non-resistor plugs on the web for under $2. I paid $1.50 each from the Auto parts Haus that's in AZ.
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RIP: 2011 E350 BlueTEC, Schwartz 81k (totaled by uninsured drunk driver) 1964 Unimog 404.1 (wrongfully towed by the city) 1994 E320, Brilliantsilber 208k (transmission shuffled off after sudden catastrophic fluid loss) 1982 300D, Silberblau under a blue repaint 256k (sold for parts) 1995 E320 Polarweiss, 131k (sold for parts) 1995 E300D Polarweiss, 287k (totaled by drunk driver) |
#38
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If you Read fully you'll note that I say Worst case scenario you can source the Correct/Proper plug from the dealer for said 4-5$
Not all NR bosch plugs are available on the aftermarket stateside.
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Blue Ridge Mercedes Jonathan Hodgman http://www.blueridgemb.com/ Enthusiast Service, Restoration & Tuning. Follow Us on Facebook! Located in the Atlanta area Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines. Mercedes Repair Atlanta |
#39
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Then you either got lucky, ordered the plugs several years ago, or you did not read the label correctly. That website in AZ offers resistor type plugs. Also, keep in mind I'm referring to the Bosch H9DC/H9DC0 for the m103 engine. If you go back go back to the website you will see that they offer H"R"9DC plugs.
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1990 190E 3.0L |
#40
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Reading this thread jogged my memory of this great post by mercmad6.3:
"He might not have,but I have had plenty of experience dealing with older Mercedes wrongly fitted with carbon string leads and resistor plugs. Mercedes Do not need suppressor leads as from 1937 on wards you could buy suppressed or non suppressed distributor and plug terminals for this very purpose. From the mid 1950's nearly all gas Mercedes came equipped with the suppressor plug terminals (5kohms) . From the 1970's all came with a resistor in the rotor (always check old rotors ) and then the distributor terminals as standard. Right up until the 1990's all Mercedes still had solid core leads,and for a very good reason. it is reliable and it is the best. The resistor plug terminals slow the spark down from a bright instant flash to a slow(relatively) arc almost. This Promotes better combustion . Use a carbon string lead ,which are nearly always offering too much resistance and you are asking for unreliability ,mostly hard starts and all that it leads too." Here's then whole thread: http://www.peachparts.com/shopforum/vintage-mercedes/349465-pertronix-radio-interference-mystery-solved.html
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Paul S. 2001 E430, Bourdeaux Red, Oyster interior. 79,200 miles. 1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron". |
#41
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Years back when it was made known that the Bosch NR plugs were going off market, I bought several sets. I'm covered.
Similar situation occurred with R-12. Did you load up before it was no longer available without license and gouge pricing?
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'91 300-SEL |
#42
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Ok, well I did it. I converted resistor plugs into non-resistors. when I explained it it seems like a lot, but the reality its that it takes only about 5-10 mins for all the plugs and you're done. Unscrew the tip, take out resistor, put in a core, screw the cap back on.
Resistor spark plug converted into a non-resistor spark plug (with pictures)
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1990 190E 3.0L Last edited by lsmalley; 01-26-2014 at 10:24 AM. Reason: link added |
#43
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Pertronix radio interference...mystery solved. My post suggests that there is no need for non-resistor plugs if using the current Bosch or in fact almost all aftermarket wire sets on our old cars.
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Graham 85 300D,72 350SL, 98 E320, Outback 2.5 |
#44
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I read today at NGK website that resistor plugs,are better for computer controlled cars.It says the noise(dirty voltage) from non resistors are damaging to the computers.
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1999 w140, quit voting to old, and to old to fight, a god damned veteran |
#45
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Looking through plug part numbers at Advance for my '88 420 it has a Bosch P/N 7905 listed. It's a Bosch Super Plus Copper Core plug. My question is... is this a non-resistor or resistor plug. The new P/N W8DC would be for the non-resistor. If there's a R ,as in WR, in the Bosch p/n would mean resistor correct?
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1983 300SD 1988 420SEL |
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