Installing EGT Probe
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
Yep, you can put a relief valve in the MAP (manifold absoulute pressure) sensor line. You can put a mini regulator (like from air tools) in the same line, or you can add a 4.7 volt zener diode to the MAP sensor plug.
All three work pretty well, the regulator works the best (yes, I have tried them all). The point of all three is to not allow the PCM to see the 24 or so psi it takes to set the light.
All three work pretty well, the regulator works the best (yes, I have tried them all). The point of all three is to not allow the PCM to see the 24 or so psi it takes to set the light.
Fleet Mechanic
Joined: Aug 2003
Posts: 1,771
Likes: 95
From: Phoenix, AZ
Hey Cookie,
My boost approaches the 24 lb. and I don't want the check engine or service engine soon warnings.
You mention a zener diode in the map sensor plug. Can you give me the details on the connection? I understand the concept of the diode preventing the 5 volts from triggering sensor. Just need to know the appropriate pin connection, wire colors, etc.
Thanks!
My boost approaches the 24 lb. and I don't want the check engine or service engine soon warnings.
You mention a zener diode in the map sensor plug. Can you give me the details on the connection? I understand the concept of the diode preventing the 5 volts from triggering sensor. Just need to know the appropriate pin connection, wire colors, etc.
Thanks!
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
Sure.
Attach the banded end of the diode to the middle wire of the map sensor plug (it's green w/black trace), then attach the other end of the diode to ground. There is a bolt on the firewall just below the cowl that works great. Only need about 12" of wire.
Attach the banded end of the diode to the middle wire of the map sensor plug (it's green w/black trace), then attach the other end of the diode to ground. There is a bolt on the firewall just below the cowl that works great. Only need about 12" of wire.
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
Do you just use a wire tap? or can you make the tap at the sensor harness connector?
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Jesser02EX
1999 - 2003 7.3L Power Stroke Diesel
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Aug 28, 2014 04:03 PM
60, 73, diesels, egt, exhaust, ford, gas, gauge, guage, install, installing, powerstroke, probe, temp, thermocouple
