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#1
04-22-2009, 05:37 AM
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NGK Iridiums
Hi, I just changed my 92 500SL's plugs from the Bosch ones to NGK Iridiums. It ran sweet as a nut for the test run of 20 miles. After that it sat for a couple of days untill tonight when I took it to the supermarket and it started to miss quite bad once normal running temp was reached.
After searching here I've found that the replacement plugs may have been the wrong choice. I have always run them and found them to be good. The car has just over 60k miles on it and has been a mint runner since I've owned it. Whats the difference between a resistor plug and a non resistor plug? And how does this affect the Merc engine? Cheerz in advance, Tim, N.Z. 
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#2
04-22-2009, 08:09 AM
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That type of plug "shouldn't" have any adverse affect on the way that engine runs!
The very little extra resistance is barly measurable. I would take a good look at the distributor caps & rotors.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#3
04-22-2009, 09:56 PM
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Yeah, the new plugs could have pushed an already worn out cap/rotor over the edge. Not that it's the plugs fault, just the fact that there is a decent plug there where before there wasn't. Can't say I've seen this on an MB, but I've seen it on many other cars...... I don't have much experience with MBs.....
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-tp 1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS 1988 560SEL "Gunther"- 190K passes anything except a gas station 1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
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#4
04-22-2009, 10:04 PM
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iridium plugs are fairly new and what the newer cars are running and run very hot since the newer engines need to run hot to be the most efficent.
__________________
1986 300SDL, 211K,Dealership serviced its whole life 1991 190E 2.6(120k) 1983 300D(300k) 1977 300D(211k)
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#5
04-23-2009, 04:21 AM
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I did change back to the Bosch plugs today and it is running fine again. Although the difference in colouration between the two types was interesting. The Bosch plugs when I removed them first time were a beautifull tan brown and the Iridiums had a white powdery, dusting on the very ends.
Maybe I should check the dizzy cap and leads. But with only 60,000 easy miles would this be premature for a worn cap and leads? Nevertheless, I will check into it as the performance and crispness of the engine with the Iridiums is worth the effort for sure. To be updated... Cheerz for the help.
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#6
04-23-2009, 10:28 AM
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I don't like NGK plugs in Mercedes motors. I have heard many story of how they caused the motor run very poorly. Your ignition system was designed on Bosch parts and thats the way it needs to be.
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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#7
04-23-2009, 10:51 AM
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Quote:
I've heard countless stories about how Resistor plugs won't work in a M103, and yet I've been running them for a long time with 0 issues aside from excellent power, smooooth idle, and good mpg's....
__________________
-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) Last edited by pawoSD; 04-23-2009 at 01:01 PM.
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#9
04-23-2009, 03:37 PM
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Quote:
After two years and about 6K miles the car dyno'd at 302 torque at the rear wheels on a Mustang load dyno... That's about 390 torque at the crank.. Doubtful Bosch plugs would have given any more power....
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http://i19.photobucket.com/albums/b1...c/GOWIDE-1.jpg 1971 280SL ROADSTER 1988 300CE TWIN TURBO WIDEBODY 1994 E320 CABRIOLET 1999 C43 AMG 2005 G55K AMG 2008 CLK63 AMG BLACK SERIES
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#10
04-23-2009, 04:11 PM
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Quote:
 That'd be sweeeet.
__________________
-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#11
04-23-2009, 07:46 PM
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Quote:
As already mentioned modern engines run far hotter than the "legacy" models.
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#12
04-23-2009, 11:25 PM
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[QUOTE=Ivanerrol;2182858]Maybe a cool name but they are many times the price of a plain ordinary set of non resistive NGK BP6EFS's.
I got mine through Ebay. Paid about $14 New Zealand dollars each landed at my doorstep. Way cheaper than $27 NZD each we pay here. Platinums are even more expensive! Any ideas on the white powdery stuff?
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#13
04-24-2009, 05:24 AM
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[QUOTE=Benzyne;2183021]
Quote:
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