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Old 08-21-2012, 11:53 AM
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190d Glow Plug relay timer ????

I have recently done a dsl. conv. to my 87 190E and am working thru some issues. I have temperalily hooked up the glow plug control unit, however in my testing it is not kicking out after the prescribed 20 sec. This will force me to use a pushbutton to "on" and "off" the GP's which I didn't want to do. I have not tested with the GP's drawing amps, just at the pins on the cont. with the gp pigtail lead unhooked as the manual. Any ideas or opinions??? Here is the link to my conv.

http://www.peachparts.com/shopforum/diesel-discussion/320825-starting-my-diesel-conversion-2-2-into-87-190e-body.html


http://www.benzworld.org/forums/w201...onversion.html

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Old 08-21-2012, 12:34 PM
sixto's Avatar
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IIRC the relay will glow for more like 45 seconds than 20 without the starter interrupt. Did you hook up a wire from the starter relay to the #2 pin in the glow relay?

Sixto
87 300D
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Old 08-21-2012, 12:57 PM
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Join Date: Oct 2011
Location: Columbia, SC
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The relay control connector has 2 trigger pins.
- Hot when in Pos 2, this initiates the pre-glow cycle when you turn the key when beginning the startup procedure.
- Hot when in Pos 3, this initiates the after-glow cycle when you begin cranking.

When you turn to Pos 2, it initiates the pre-glow cycle. Based on the ambient temperature from the sensor in the relay, the relay turns on the pilot light and turns it off a few seconds later. This time period is variable based on ambient, and is meant as a guide for how long to wait before attempting to start.

When you turn to Pos 3, in addition to energizing the starter, you are also initiating the after-glow cycle. The glow plugs need to operate for several tens of seconds after cranking until things get heated up sufficiently for self-combustion to reliably occur. Again this time delay is influenced by an ambient temperature sensor in the relay.

Note that some cars have an ambient sensor on the head between the glow plugs instead of in the relay itself.

By checking the voltage on a glow plug you should be able to verify the after-glow operation.

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