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#1
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Large Spark Plug Gap and New Ignition Wires
Hello. I recently changed the spark plugs on my 1989 260e with around 135,000miles and out of curiosity I checked the gap on the old plugs. I was quite surprised to find that almost all six of them had gaps around .052 and some upwards of .056. The new plugs were ordered from FastLane and I left them at the pre-gapped .032. Anyone know what the deal is with the huge gap on the old ones? Could that have been hurting performance significantly, and should I increase the gap on the new ones a little? The engine seemed to rumble a little just at idle with the old ones and still does a little with the new ones.
Second question - is it about time to replace the ignition wires? As far as I know, they are roughly 13years old with 135,000miles on them. Will replacing the wires have any positive effect on performance? I think I can get a set of the wires on eBay for around $80. Thanks for any help/info! |
#2
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Unless you drive at 130MPH, you can gap the new plugs at .035" to .040 & have a "smoother" idle.
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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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