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  #1  
Old 01-13-2001, 11:30 PM
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My '90 300SE has a slight miss at idle. I replaced the plugs 5K ago and they looked good. I remember reading here a while back about looking under the hood in the dark.

I did so tonight and noticed some arcing. The wire from the coil is running between the thermostat housing and a little metal bracket so it touches the housing. I see a constant arc at that point. The wire has a slight cloudy mark where it touches the housing.

I also observed an intermitent, random flash in wires #1,2&3 between where thewire comes out of the valve cover and the spark plug. There are more flashes at #1.

I can't remember what this means. The PO replaced the wires about 30K ago, with what I don't know. The shop that has serviced it uses good quality parts though.

Can I simply re-rout the wire from the coil? Or does that grey cloudy mark mean The wires are shot?

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91 300E 120K
90 300SE 275K (sold)
92 BMW 525iM 120K
90 BMW 525iA 175K
85 300D 175K (sold)
84 300SD 245K (sold)
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  #2  
Old 01-14-2001, 01:12 AM
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You need to replace your wires. Make sure to get original Bosch equipment.
Had a guy buy some wires at Napa once for $29.95 or so. He came to me with the engine shaking real bad. His car even had a hard time starting. He was better off with his old Bosch wires. Anyway, we ended up returning the NAPA wires and getting the originals.
I couldn't belive a store could even sell something like that.

You get what you pay for. There is a reason why Bosch wires cost over $100 per set.

Vin








[Edited by vinamg on 01-14-2001 at 12:15 AM]
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  #3  
Old 01-14-2001, 02:33 AM
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Thanks Vin,

AutoZone is promoting Bosh wires now. Are these the same as OEM?
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91 300E 120K
90 300SE 275K (sold)
92 BMW 525iM 120K
90 BMW 525iA 175K
85 300D 175K (sold)
84 300SD 245K (sold)
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  #4  
Old 01-14-2001, 03:56 AM
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Not too sure, you can check it out. They should come with a warranty card from Bosch. You can also go by the price. I know they cost around $115 for the 6 cylinders.

Another option is to order it from mercedesshop parts.

Vin
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  #5  
Old 01-14-2001, 09:55 AM
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On many MB's the OE wires are Beru, & the replacement Beru's are much better than replacement Bosch! The aftermarket Bosch are not solid core copper, but resistor(woven fifer) wires like American cars use.
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