Glow Plugs
Last year my check engine light went on. Went to dealer and was told I had a bad glow plug but it was not necessary to fix it right away and when I did I should just do all 8 since if I had one bad o...
Forum Discussion
As DiskDoctr pointed out other things can happen but they are unlikely. But I would get them replaced because it will make for harder starting in cold weather which puts a further strain on your starter and batteries.
They aren't difficult to do on the LBZ but if you aren't the do it yourself type have the dealer do them. If you don't get them replaced make sure to plug in the block heater for a few hours when the temperature drops to 32 or below to make starting faster; it will still start with bad glow plugs and no heater in even colder temperature but it will be an ugly start.
Note if you use the block heater it should be on for a few hours, don't just plug it in for 1 or 2 hours especially if the temperature is at or just above freezing. The LBZ compares temperature readings from several sensors and plugging in the block heater for a short time when the temperature is NOT well below 32 may trigger a CEL as I found out right after I bought mine new in December 2005. The sensors do a cross check and use of the block heater for a short time will fool the system into thinking one of the sensors isn't reading correctly. The CEL can be reset by a reader or it will reset itself after a few normal starts; the only operational change I found when it was on for this issue was the transmission wouldn't shift into 6th (second overdrive ratio).
They aren't difficult to do on the LBZ but if you aren't the do it yourself type have the dealer do them. If you don't get them replaced make sure to plug in the block heater for a few hours when the temperature drops to 32 or below to make starting faster; it will still start with bad glow plugs and no heater in even colder temperature but it will be an ugly start.
Note if you use the block heater it should be on for a few hours, don't just plug it in for 1 or 2 hours especially if the temperature is at or just above freezing. The LBZ compares temperature readings from several sensors and plugging in the block heater for a short time when the temperature is NOT well below 32 may trigger a CEL as I found out right after I bought mine new in December 2005. The sensors do a cross check and use of the block heater for a short time will fool the system into thinking one of the sensors isn't reading correctly. The CEL can be reset by a reader or it will reset itself after a few normal starts; the only operational change I found when it was on for this issue was the transmission wouldn't shift into 6th (second overdrive ratio).
