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1987 260E 2.6L
I pulled out the plugs to check and they all look quite dirty (see photos). Anyway, I sprayed some WD40 on the tip to try clean them up a bit. However now the car wouldn't start up anymore. It will crank and crank and I can confirm that there is voltage going to the plugs, but nope, engine won't start up. Is it a coincident or is it because the WD40 has basically ruined the plugs? Are plugs designed in a way that you can not try to clean them up at all? I am going to get a new set but just wanted to start the car up.
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