check eng. light & glow plug light comes on
 

I live in Hawaii (never below 68 degress) do I need to change the glowplugs?
any ideas? thanks RB 1999 e turbo D

IMHO, yes. The longer you leave them in there the more the chance one will break off in the head when you do want/need to change them.

Same problem
 

I have the exact same problem in my '99 E300, CEL stays on and GP light comes back on after going off. You can check for blown glowplugs at the relay next to the washer bottle in the driver's side engine compartment. Unplug the large harness that carries power to each plug, check each of the 6 connectors with an ohmmeter against a ground such as the intake. Resistance for good GPs should be ~6 ohms.

3 of my plugs are bad, I'll be changing all 6 soon. The check engine light results from a glowplug malfunction code.

In Hawaii having functional GPs may not make that big a difference but it certainly helps cold starts. In CA my cold starts each morning are extremely hard with only 3 working GPs (and probably partially-gelled BD too).

That's 0.6 ohms on a good plug. If you're lucky and it's only #1 plug that's bad, you can get that one changed without removing the manifold.

Len

Same problem here.

Do you check the resistance on the pins of the relay? If so, and you get a bad reading, on one of the pins, how do you know which glow plug is attached to which pin?

WC

They're numbered, read your other thread.

check dieselgiant.com's diy on gps.

You DO NOT want the tip to break off, blow a hole through the prechamber and prechamber and gp go out through the valves.

You are not checking the pins on the relay but the female parts that are in the socket that you pull off.
The Diesel Gaint site has a good photograpic sequence on how the check them.