Rockfrog Posted January 12, 2019 Share Posted January 12, 2019 So, recently did a tune up, swapped the stock style Renix plugs for those meant for the later HO (seeing as I have a 97 TJ motor currently). This rose the question of the differences between projection plugs (TJ motor) and non projection plugs (Renix) and then the additional issue of heat range (RC9 vs RC12). The old plugs looked OK, even color and no fouling after a year. But the new plugs seem to run a bit better (possibly more to do with the new cap/rotor/wire?). So I am asking for the advice of those more in the know on this one. 1988 MJ 1997 4.0L Ax15 Renix MPFI 00 intake and TB 94 exhaust Sent from my SM-G930W8 using Tapatalk Link to comment Share on other sites More sharing options...
cruiser54 Posted January 13, 2019 Share Posted January 13, 2019 I use NGK ZFR5N in all of them. Projected tip. Link to comment Share on other sites More sharing options...
bubbanbrenda Posted January 13, 2019 Share Posted January 13, 2019 18 hours ago, cruiser54 said: I use NGK ZFR5N in all of them. Projected tip. Even the 2.5? Link to comment Share on other sites More sharing options...
carnuck Posted January 14, 2019 Share Posted January 14, 2019 I’m running NGK BKR6EK (2288) plugs in my Renix 2.5 and 4.0, both with a functioning knock sensor and the initial plus acceleration engine timing (when warmed up so the sensor was adjusting time) was advanced more and running with a gutted cat ran lower HCs and NOx numbers than brand new Autolites. Same tank of gas, there was a “seat of the pants” power difference too. Link to comment Share on other sites More sharing options...
bubbanbrenda Posted January 20, 2019 Share Posted January 20, 2019 On 1/14/2019 at 12:48 PM, carnuck said: I’m running NGK BKR6EK (2288) plugs in my Renix 2.5 and 4.0, both with a functioning knock sensor and the initial plus acceleration engine timing (when warmed up so the sensor was adjusting time) was advanced more and running with a gutted cat ran lower HCs and NOx numbers than brand new Autolites. Same tank of gas, there was a “seat of the pants” power difference too. Thanks I'm just getting started getting this thing back to a dependable daily driver, I've just about got the suspension ironed out and a new tank/pump/sending unit in place and working like it should. Just getting started on all the electrical gremlins that seem to have been made worse by the previous owners. Link to comment Share on other sites More sharing options...
Pete M Posted January 20, 2019 Share Posted January 20, 2019 have you run through Cruiser's renix tips yet? should be one of the top threads in the link in my signature. Link to comment Share on other sites More sharing options...
cruiser54 Posted January 20, 2019 Share Posted January 20, 2019 Here ya go.... Link to comment Share on other sites More sharing options...
bubbanbrenda Posted January 21, 2019 Share Posted January 21, 2019 On 1/19/2019 at 8:44 PM, Pete M said: have you run through Cruiser's renix tips yet? should be one of the top threads in the link in my signature. That's what I'm working on now grounds and suspension are my main focus at the moment. The PO was trying to make it into a rock crawler, and I'm trying to undo all that. Link to comment Share on other sites More sharing options...
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