How does my 1985 EEC-IV computer determing timing advance? What are the variables involved (MAP sensor and what else?) 
Electronic Timing Advance
Senior User
Joined: Sep 2000
Posts: 162
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From: Castine, ME
Electronic Timing Advance
really?! I never would have guessed that. So i take it it gets this information from the temperature sender on the thermostat housing? I always thought that was simply for the guage in the cab. So if my sender was not hooked up it would not advance the timing?
captntim
'86 F150 4x4 300I6 SWB NP205 4speed
captntim
'86 F150 4x4 300I6 SWB NP205 4speed
Posting Guru
Joined: Jan 2001
Posts: 2,358
Likes: 3
From: Nebraska
Electronic Timing Advance
I think the MAP sensor supplies most of the info for it to determine timing. Your truck actually has two temperature senders. The one at the thermostat housing goes to the computer, and there's one in the head way in back on the passenger side that goes to the temperature guage.
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1986 F-150 4x4 300 I6 NP435
Warn hubs, DeeZee bed caps, '96 XLT bench seat, new paint
--------------
1986 F-150 4x4 300 I6 NP435
Warn hubs, DeeZee bed caps, '96 XLT bench seat, new paint
Senior User
Joined: Sep 2000
Posts: 162
Likes: 0
From: Castine, ME
Electronic Timing Advance
well....that would explain a few things. My temperature sender at the thermostat housing has been cut (why, I don't know). Since my temp guage never works...I just assumed that was the reason. I suppose I better fix that. Also...where exactly is the MAP sensor?
thanks
captntim
'86 F150 4x4 300I6 SWB NP205 4speed
thanks
captntim
'86 F150 4x4 300I6 SWB NP205 4speed
Posting Guru
Joined: Jan 2001
Posts: 2,358
Likes: 3
From: Nebraska
Electronic Timing Advance
The MAP sensor is on the passanger side fender next to the battery. Should have a vacuum line and a few wires coming out of it.
--------------
1986 F-150 4x4 300 I6 NP435
Warn hubs, DeeZee bed caps, '96 XLT bench seat, new paint
--------------
1986 F-150 4x4 300 I6 NP435
Warn hubs, DeeZee bed caps, '96 XLT bench seat, new paint
Senior User
Joined: Sep 2000
Posts: 162
Likes: 0
From: Castine, ME
Electronic Timing Advance
ha....so that's what that is...cool, thanks
captntim
'86 F150 4x4 300I6 SWB NP205 4speed
captntim
'86 F150 4x4 300I6 SWB NP205 4speed
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