I had them unscrew on mine once and had a strange misfire I even hooked it up to my laptop see if the codes would give me any indication and it said that one bank was out of range or something like that what I ended up doing is pulling off those threaded on bits crushing them a bit with a pair of pliers and then screwing them on very tightly and that seems to have done trick


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2016 M3W John A Prestwich Special
1952 Ford 8N
1968 Honda CL175,and 2018 Ural Retro