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#1
12-13-2007, 01:02 PM
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Danger: RESISTOR SPARK PLUGS???
related to this post Danger: RESISTOR SPARK PLUGS
we just had an issue with a customer a few weeks ago, for what we had we were dealing with bosch plug FR8DPP33, one of the techs here was diagnosing a rough idle for a 112 V-6 engine, the rought idle was obvious, but not enough to set a misfire code, when he checked the plug number installed in the car it was F8DPP33, knowing that through bosch all that was available to the aftermarket was FR8DPP33 he assumed that someone had previously installed incorrect plugs, so he recommended to replace them with the FR8DPP33, once that was done, the rough idle was obviously still there, and he told us that mercedes had installed the set of plugs, so we did some checking and found that untill the supply of the FR8DPP33 plugs were exhausted mercedes was the only one who sold them, so we began ordering all our plugs from mercedes directly instead of worldpac, we wanted to install same as what dealer was using, i guess their supply ran out because about 4 weeks later we started getting the FR8DPP33 plugs from mercedes, due to the higher cost from mercedes we started getting them from worldpac again. so the R plugs will be replacing the NR plugs for some applications. by the way, the rough idle was caused by defective plug wires, replacing all 12 soved the rough idle issue. below are some examples directly from a bosch chart Old#- Replaced by F7KTCR - FR7KTC F8KTCR-FR8KTC H8DC AND H8DCO-HR8DC+ (YTTRIUM ADDED*) H9DC AND H9DCO-HR9DC W7DC AND W7DCO-WR7DC+ (YTTRIUM ADDED*) W8DC AND W8DCO-WR8CD+ (YTTRIUM ADDED*) W9DC-WR9DC W9DCO-WR9CD+ (YTTRIUM ADDED*) F8DPP33-FR8DPP33 *http://en.wikipedia.org/wiki/Yttrium
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1967 250 S 1967 280SE 1968 250S 1971 280 SE 1973 220 1974 280 S 1975 450 SEL 1976 220 D 1979 300SD 1983 300 SD 1985 230 TE euro 1986 280SL 1986 500 SEL euro 1986 190E 2.3 1990 300 SE 2003 C230 K 2004 C230 K 1987 560SEL 1987 300SDL now in canada 2005 C230 1998 C43 AMG Sold to DON 1993 190E 2.6 300TD Former daily driver Totaled current: R320 CDI Ram 2500 Cummins 
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#2
12-13-2007, 02:13 PM
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I don't know what the "DANGER" is related to either?????
Resistor plugs are fine on 99.9% of all MB applications.
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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
12-13-2007, 02:15 PM
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Quote:
i agree hence the ???
__________________
1967 250 S 1967 280SE 1968 250S 1971 280 SE 1973 220 1974 280 S 1975 450 SEL 1976 220 D 1979 300SD 1983 300 SD 1985 230 TE euro 1986 280SL 1986 500 SEL euro 1986 190E 2.3 1990 300 SE 2003 C230 K 2004 C230 K 1987 560SEL 1987 300SDL now in canada 2005 C230 1998 C43 AMG Sold to DON 1993 190E 2.6 300TD Former daily driver Totaled current: R320 CDI Ram 2500 Cummins
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