menac1ty Posted November 26, 2019 Report Share Posted November 26, 2019 I've read somewhere that the 8plug ignition effectively advances the ignition too. Also read that spec is 3 degrees btdc with vacuum plug off at idle. Now, 2 things: My truck uses 4plug head, almost all z24's where I live do. So I assume more advance is required. I live in a 4000ft (1300meters) elevation which I've also read need higher advance. I used to run it at 10-13 degrees btdc in here and it wouldn't ping, power was good but it failed emissions. The local 'expert' unplugged the vacuum advance hose and it passed emissions. flawlessly and I was sure the carb was adjusted. So I assume it's a bit too much of advance. I'm running it at 5 degrees now and the power is not bad but I feel like it could be better and I'm due for emission inspections. Advice? 1 Quote Link to comment
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