Loosening the glow plug 2 turns, is WAAAAY too much! You need to only loosen it about 1/4 of a turn from the normal seating position. With 2 turns, you will more than likely not be able to start the motor because the filiment is too far from the combustion chamber, and also.....you run a serious risk of blowing the plug out of the threads, which can both ruin your head, and also your real head (ie. it will come flying out at you like a bullet). As stated, check your needle settings....