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Old 05-30-2013, 11:00 AM
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bosch FR8KTC plugs

I use these or the Densos made like them.High mpgs,power,and long lasting.These were my factory plugs,no platinum,no iridium,just good ole copper

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Last edited by oldsinner111; 09-13-2016 at 01:09 PM.
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Old 05-30-2013, 03:16 PM
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Look like resistor plugs to me so cannot be used on m102/3/4
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  #3  
Old 05-30-2013, 03:19 PM
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they came in the car
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Old 05-31-2013, 06:29 AM
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why the hate about plugs

I was old enough to under stand when car makers left the dinosuar non resistor plugs.They were wreaking havoc on TV and FM channels.Police couldn't hear radios.
Why did Mercedes stick with old technology?For one last two sets Ive run were resistor plugs,Even the $12 plugs reduce voltage at the coil making them last longer.I have original coil at 177,000 miles
If iridium works for one driver why belittle him,or runs resistor plugs.I have racing timeslip to prove my plugs are good,there btter than NGKs,and I run the Denso brand,next brand will have 3 grounding straps.I get better mileage than most 320s
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Old 05-31-2013, 07:58 AM
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Mercedes "didn't stick with old technology"....
The resistance is built into the spark plug wire connector.
Using a resistor plug with the correct wires increases the overall resistance and can decrease performance.
Electronics are sensitive to parameters outside of the design range.
Increased resistance can cause long term degradation of the ignition module.
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Last edited by RBYCC; 05-31-2013 at 08:10 AM.
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Old 05-31-2013, 08:48 AM
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well I'm in luck I have no module,thats what Doc said,I tell you what I will find these non resistor and test them at the track
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Old 05-31-2013, 11:12 AM
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Its probably negligible and you won't notice a difference by foot only. I just want to avoid long term accelerated degradation of components since it wasn't designed this way.

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