well i had the low needle even with collar and that didnt work. we went inside for a litte while and it cooled off so when we came back out we went ahead and put it 1/2 a turn in. just all at once when the car was off and was cool. it was kinda worse. mighta been to much of a turn at once. my freind who has the car doesnt have any extra glow plugs at the moment so i'll just sell him one of mine and we'll see how it goes. and whats the farthest you've gone in on the low speed? cause most of my cars low speeds stay about even with the collar to 3/4 turns in havent been any lower