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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,274
That yellow relay is the overboost fuel pump cut off relay.

It disconnects the grounds to the 2 front fuel pump relays (the 2 red ones at the rear end of the front trunk relay panel) shutting off both fuel pumps if the overboost sensor sees more than 1.2 - 1.35 bars (depending on how old and tired the sensor is) of boost pressure.

It's a safety feature so you don't hurt the motor if the wastegate stops working.

It has nothing to do with ignition though.

By the way, from what I can see in the picture, your engine bay looks real clean and in good condition.
Thats a very good thing.
Old 05-22-2010, 05:53 PM
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