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Old 12-25-2011, 06:20 AM
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GPR issues

I have a 2001 7.3 and i have what appears to be two gpr behind the fuel bowl. what is the purpose of two of them? Is there a relay for each bank or is the up front relay something different?
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Old 12-25-2011, 06:24 AM
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The upfront taller relay is used for the intake air heater, while the smaller one is for the glow plugs. Not all 7.3's had the intake air heater. The intake heater is used only in real cold climates.

The shorter relay is the GP relay and controls both banks together.
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Old 12-25-2011, 06:26 AM
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Is there a way to test the air intake heater relay? and where is the heating unit located on the truck?
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Old 12-25-2011, 06:32 AM
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Follow the wire coming off the relay and you will find it run to the x pipe or "spider" coming right off the turbo. The heater has one wire from the relay and a ground wire going to it.

You can try and key on the truck and check for voltage at the heater itself. Often the heater will burn up though. And I forget what the ambient temp had to be but I think it has to be below freezing for the intake heater to even come on. Some people delete the heater anyway.

Another way to test it would be to run a KOEO test, which will cycle the relay.
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Old 12-25-2011, 10:27 AM
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I pulled the AIH heater off of my truck and used a Dodge oil pan drain bolt, slightly modified, in it's place as the boost pressure feed for the Isspro gauges I installed. Looks almost factory too.
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