Originally Posted by Adriel

I see a couple of mistakes on this thread.

First, YES a bad glow plug can affect any system, but affects the later systems less. I know, as number five is out, and in the "winter" had to plug in the block heater for a bit. Otherwise she would run on four until enough heat for five to come on.

Second, do not use Bosch glow plugs! They are junk! Went bad in a few days to a month. Got a box of Beru to install, just haven't done it because I need the tool and summer is here.