Hey guys, I have a 90 N/a Zed recently its been misfiring in second and third gear when you accelerate or around 3500rpm. One of the guys from here suggested it may of been the O2 sensor and to unplug it and see if that makes a difference, I tried that out but no luck its still misfiring at high RPM. I have bought some new NGK plugs from Concept Z they should arrive in a few weeks, thinking maybe the plugs should be changed since she's coming up to the 200,00km mark. The pump and other major parts were done before I purchased her. I am located in North Brisbane and I'm looking for someone to change the plugs for me and change the trans and diff oil as I don't trust myself doing it and I don't have the tools either Thanks heaps
Might have nothing at all to do with your issue as mine was a permanent misfire (not only at high rpm) but I had a recent misfiring problem I couldn't diagnose and it ended up being spark plug connectors were crap (the bit that plugs into the coilpack)... If it ends up being hard to diagnose they are only $50 for a set of 6 on ebay and might be worth trying..... but yeah i'd go with spark plugs first... have you pulled them and checked none are fouled?
