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#1
08-19-2005, 10:38 AM
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I really need help
I have an 89 260E runs great untill i just put 6 new bosh platuim 2 spark plugs in now if u leave it on it will ildel but after a while it drop out and die then u would have to start it over and it will start with its usual one turn.
Can anyone give me some advice. 
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#3
08-19-2005, 01:35 PM
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i dont
think the plugs are the problem, unless there is something wrong withthem.
ie wrong gap, broke poecelain while installing, loose or damaged plug wire. i would examine the plug wires carefully especially the connections to the plugs to see if you might have damaged one while r and r. then if that reveals nothing take the plugs out and look for cracked porc. and check gap. when i had a 300e 2.6 i am sure i used platinum plugs with no prob. 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.
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#4
08-19-2005, 03:50 PM
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I would take a good look around the engine to make sure that no electical connections or vacuum lines were knocked off when the plugs were being changed.
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#5
08-19-2005, 04:22 PM
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replace your plugs with the correct bosch plugs (H9DC or H 9 DCO depending on manufacture date) for $1.75 each and your problem will go away. Do a search on "spark plug and resistor" and you'll find information as to why the platinum plugs do not work well with Mercedes ignition systems. Other techs can comment about this as well..
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Daily Driver: 02 E430 4MATIC In the family: '03 E500 // '04 ML500 // 64 220SE
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#6
08-20-2005, 08:24 AM
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Bosch Platinum plugs in Mercedes
It is simply NOT TRUE that Bosch platinums do not work well in Mercedes. It appears that a RESISTOR plug, whether regular copper or platinum, will not work well in most Mercedes. But, I have installed Bosch Platinums in several Mercedes with excellent results. Obviously, they were not resistor type plugs and I used both Bosch 2's and quad's in these cars, with good results. Why do certain people think the simple answer to every ignition problem is to eliminate the platinum plugs? It just is not true.
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Ben Harrison Carter 1999 Mercedes ML320 87K 1992 Mercedes 300CE 89K 1995 Corvette 29K -- Sold Dec 09 1989 Mercedes 420SEL 99K -- (Sold 4/08) 1968 Mercedes 230S (106K) (Sold 9/06)) 1976 Mercedes 450SEL 130K (Just sold - 06) 1961 Mercedes 220Sb (sold years ago)
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#7
08-20-2005, 09:40 AM
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Quote:
You changed plugs. It now does not run great. What would you suspect first? As other have advised, I advise you to first go back to the plugs that did not give you the problem. If the problem persists, you may then conclude that it is not the plugs and another problem was created when you changed the plugs... Best Regards, Jim
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