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never use bosch in a american car and u have to check the gap on all plugs to make sure theyre correct u just gotta make ur careful when gaping the ground eletrode on th ebottom ... only use acdelco or ngk plugs preferablt irodin ones
You did not mention your car model, but if it is new enough that you are using Platinum +2 plugs, it is probably less than 20 years old. The gap does not really matter with a modern electronic ignition.
The books don't list a gap because it is easy to damage modern plugs trying to adjust the gap. Better to leave it as you find it.
If the plug has been dropped causing the gap to close, you don't want to use it. A chunk of porcelain breaking off inside a cylinder can do a lot of damage.
0.042-0.046 is the correct gap for your spark plugs,If it is backfiring now and was not before make sure you were not sold platinum bosch plugs and if you are using factory plugs,then I be looking for a faulty spark plug.Also make sure the firing order is correct.
If it wasn't misfiring before. Make sure you have the proper gap on the spark plugs. Make sure you have the wires connected in the correct order. If you have the old wires, you may want to end up trying those one at a time to make sure you don't have a defect wire either. Thank you, Lee
if you have a no spark scenario i would check your crank sensor located at the top left side of the harmonic balance pulley.the crankshaft (about 11'oclock) a 2 wire plug with a sensor on it check to see if it is damaged or unsecured. this sensor can cause no spark if not working correctly. This sensor is based of frequency not voltage testing is difficult, just make sure that there isnt too muck air gap. and that it is secured.Lastly may want to check timing possible that the belt has jumped some teeth and she has fallen out of timing. maybe a bad tensioner The coil will adapt i think up to 10 degree, ****** or advance. Good luck
Hello motokid40: My name is Roger and I will help you. The correct plug gap for the sp-432 plug is 0.044 in. Should you need further help please just ask. Please rate the answer. Thank You for using Fix Ya. Roger