Another quick glow plug story ....

My light stopped illuminating about 6 months ago (but, would illuminate about 30-60 seconds following startup) ... with roughness at startup ... was generally warm weather, but I knew cold was coming ... rougher and rougher as the weather cooled. From all the great posts here, it appeared this was a common phenom.

So, quickly did the standard continuity check from the battery to the harness plug at the GP relay - only number 5 was showing completely open, so dug out set I removed four years ago ... they all tested good. Removed and tested #5 (easier than I thought it would be, but no all looked as easy), and it was open. Replaced with one of the old ones (all Bosch, btw, but new ones had a slightly different design with tapered end) and works great - start up much smoother!

Now, to the "point to ponder" - it appears from my reading here that most folks simply replace all the GPs when they tackle the job (several folks have mentioned having 3 or 4 GPs inop, but don't mention the GP light not illuminating - non-loop, perhaps?) ... perhaps a more reasonable course of action is to replace only the ones that are bad vice the entire set? This premise based on thought that some GPs have a production flaw that causes them to short or open during use and some GPs may never fail ... comments?

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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg