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This question and discussion is based on a post from another thread where someone replaced their worn 0.043 gap plugs in a '90 Renix engine with new .035 gaped plugs, after which the mileage dropped by 2 mpgs from 19 to 17.
So my question is:
Has anyone experimented with, and or experienced changes, good or bad with different plug gaps on the Renix Era engines? If so has anyone found a more optimal plug gap, or plug and plug gap to maximize mileage. IF so what were the differences in mileage, the gaps and plugs used!
This question might need to include discussion of the old MTBE and new E10 ethanol gas as well used in the tests.
I see no reason not to include the HO motors, and OBD-I and OBD-II years, but please specify the year and any non OEM add ons if any, as the 3 different computers and the HO engine might like different gaps and plugs than the Renix, etc.
I am currently using an autolight platinum single electrode plug at a 0.035 gap when it was installed about 10,000 miles ago and getting about 20 mpg on a pure 55 mph highway run (call it non stop) now, and averaging 14.5 mpg with mixed city driving on my 87 Renix 4x4 all stock XJ, and stock 3.55 rear end. As I recall I checked my gap earlate last year, and it was still 0.035 unchanged.
So let the Mayhem begin!!!! Post your data and results here!!!!
So my question is:
Has anyone experimented with, and or experienced changes, good or bad with different plug gaps on the Renix Era engines? If so has anyone found a more optimal plug gap, or plug and plug gap to maximize mileage. IF so what were the differences in mileage, the gaps and plugs used!
This question might need to include discussion of the old MTBE and new E10 ethanol gas as well used in the tests.
I see no reason not to include the HO motors, and OBD-I and OBD-II years, but please specify the year and any non OEM add ons if any, as the 3 different computers and the HO engine might like different gaps and plugs than the Renix, etc.
I am currently using an autolight platinum single electrode plug at a 0.035 gap when it was installed about 10,000 miles ago and getting about 20 mpg on a pure 55 mph highway run (call it non stop) now, and averaging 14.5 mpg with mixed city driving on my 87 Renix 4x4 all stock XJ, and stock 3.55 rear end. As I recall I checked my gap earlate last year, and it was still 0.035 unchanged.
So let the Mayhem begin!!!! Post your data and results here!!!!