I need some advise on the proper plug gap, I am replacing my spark plugs with a set of brp7eix plugs. I have an 85 qv with 7800 miles on it. When i checked the gaps on the new olugs they very from .30 to .52
+1, use a feeler gauge you can hold up and measure by eye, the electrodes on iridium plugs are extremely fragile. Also, those plugs have resistors built-in, so you might consider replacing the extenders with black non-resistor type if you still have the red resistor ones (you can check with a multimeter, should be around 2.5K ohm, but some of mine were up to around 5K). Not a big deal though, it should run fine with either, unless an extender is failing and showing significantly higher resistance.
Regarding extenders - you must measure the extenders to determine if they are resistor-type or not. You cannot go by color. A non-resistor extender will read less than 1 ohm.
Surprised you are seeing such variances on Iridium plugs - the 3 or 4 sets I have fitted have all been identical out the box. Be very careful trying to adjust them - they break easily.
Ditto. It was my understanding that you should NOT try to adjust the gap on iridium plugs, that they come pre-gapped from the factory. I've checked the NGK ix plugs I've gotten in the past, and they were all pretty much around .030-.032, IIRC. I've installed them as is in a 308 with Electromotive and in my 328 stock ignition, and they have worked just fine right out of the box.
I adjust them routinely. Why not? It's not done with a hammer and chisel you know. The set I installed last week ranged from .014 to .04 And I havn't installed a plug with a .032 gap since Chevies had carburators and points. Don't touch the center electrode? Whatever.
