I have a 79 Mercedes 300D that has been causing me a few problems these past few mornings. It strated with the dashboard glow plug indicator light flashing for about 30 seconds once the car started, that progressed to it becoming increasingly difficlt to tart the car in the mornings (only the first start of the day, all subsequent starts where fine). Last week it would not start at all.

After a glow plug change and a new air compressor pump it semed fine on the first few starts. The new 'issue' is that the dashboard indicator light is flashing when the key is turned to the 'glow' setting and starting is kind of difficult. It is turning over first time, but needs a good few seconds to fire up.

Should I be looking at the relay?

Thanks

which style of glow plugs are in your car? ... do you have the steel hard lines connected with thumb screws separated by insulators between the Glow Plugs?
if so, I would first get a set of pencil glow plugs and follow dieselgiant.com to the mercedes glow plug upgrade DIY page, and be prepared for much better starting.

John

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Thanks, I'll give that a look over.

One other question, in my research over this question I have tried a thousand different combinations of searches in various locations but never seem to find information about the glow plug indicator flashing before the engine starts, lots of references to it flashing after the engine fires, but none before?

Anytime the indicator is flashing, you've got one or more than one glow plug that is non-functional. In your case, you've still got glow plug issues.

thanks...