speed density sensor location?
speed density sensor location?
Junior User
Joined: Sep 2004
Posts: 57
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I had wondered what that thing attached to the hood is also. I should find the wire colors and look in my manual as to what it connects to.
The MAP sensor (at least in my truck) is on the passenger side near the firewall. It has a vaccuum line attached to it and a 3 wire plug. Can't miss it
-Chris
The MAP sensor (at least in my truck) is on the passenger side near the firewall. It has a vaccuum line attached to it and a 3 wire plug. Can't miss it
-Chris
New User
Joined: Aug 2004
Posts: 13
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From: Atlanta
speed density is a system, not a sensor. there are speed density and mass airflow systems. speed density systems rely on many sensors on the engine, drivetrain, etc. to provide information to the computer so it can calculete the advance curve and injector duty cycle. speed density systems have a preprogrammed fuel curve that doesnt change, so different mods that increase/deacrease airflow will make the engine run lean or rich. this due to the fact that speed density systems dont measure airflow directly. Mass airflow systems however do not require as many sensors to run the engine and have a flexible fuel curve because they directly measure how much air the engine is pulling through it. it is a good idea to change to a mass air system if you plan to do any mods, but the speed density system does a good job running a stock motor.
Elder User
Joined: Aug 2003
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From: Houston
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Lead Driver
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From: Concord, NC
speed density systems have a preprogrammed fuel curve that doesnt change
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Senior User
Joined: Jan 2004
Posts: 342
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From: British Columbia
gotta lay off the C.C. for a while
Seems that the thing under the hood IS a light. It resembles a light even better when there is a light bulb in it 
With that light bulb in the socket now, the truck should be able to sense its speed alot better now eh?
The reason it threw me off is no bulb was in it(new to me truck). And on GM's the light bulb and mercury switch are a single unit. Ford's are obviously a two piece deal. Woops!
With that light bulb in the socket now, the truck should be able to sense its speed alot better now eh?
The reason it threw me off is no bulb was in it(new to me truck). And on GM's the light bulb and mercury switch are a single unit. Ford's are obviously a two piece deal. Woops!
Last edited by coplin; Sep 18, 2004 at 08:03 PM.
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