I have a 1998 24v and a 2002 24v. When they are both beside each other in my yard not plugged in when it is very cold out the 2002 will always start first try no problem but the 1998 will not. I have to cycle the glow plugs about 3 times on the 98 and crank on it for a while. Why is this ? Is their something different in the 2002's or is something wrong with my 98 ?