sensor expertise for 1982 needed
Thread Starter
Safety Car
Joined: Oct 2008
Posts: 4,022
Likes: 30
From: Los Angeles CA
sensor expertise for 1982 needed
sorry don't know what is what and don't have a "factory manual" corvforum is my manual..
what is what on my 82
think the switch between plugs 6 and 8 is my aux fan switch
how about the one above the starter?
etc.etc.
what is what on my 82
think the switch between plugs 6 and 8 is my aux fan switch
how about the one above the starter?
etc.etc.
Last edited by slickfx3; Nov 18, 2015 at 11:19 AM.
Melting Slicks
Joined: Apr 2009
Posts: 2,632
Likes: 112
From: Great Plains Iowa
Yep, the two-terminal switch that is screwed into the head above/between #6 and #8 is for the electric fan and the switch that is above/between #1 and #3 is the temperature sender for the gauge. The switch above the oil filter is for the engine oil temperature and the switch at the front/right of the intake manifold is for the temperature sensor for the ECM. The BIG switch next to the distributor is for the oil pressure and it also turns on the fuel pump relay.
Thread Starter
Safety Car
Joined: Oct 2008
Posts: 4,022
Likes: 30
From: Los Angeles CA
Le Mans Master
Joined: Oct 2006
Posts: 7,123
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From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
Compared to the expenses of buying parts that are not need for the problem, and the time spent chasing ghosts, the FSM is cheap. Not to mention how much easier it is to simply FIND which switch/sensor is at that particular spot.
Race Director
Joined: Apr 2007
Posts: 11,152
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From: South Western Ontario
No, it doesn't. There is a pressure switch that connects from +12V to the fuel pump. But, the ECM ALWAYS energizes the fuel pump relay when the engine is turning over (cranking or running). So, the only conceivable purpose for the pressure switch is a backup to the relay.
Pretty much every early GM fuel injection systems had that pressure switch and you could disconnect or remove it without affecting the operation.
Pretty much every early GM fuel injection systems had that pressure switch and you could disconnect or remove it without affecting the operation.
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Safety Car
Joined: Mar 2007
Posts: 3,652
Likes: 49
From: Bridgewater nj
No, it doesn't. There is a pressure switch that connects from +12V to the fuel pump. But, the ECM ALWAYS energizes the fuel pump relay when the engine is turning over (cranking or running). So, the only conceivable purpose for the pressure switch is a backup to the relay.
Pretty much every early GM fuel injection systems had that pressure switch and you could disconnect or remove it without affecting the operation.
Pretty much every early GM fuel injection systems had that pressure switch and you could disconnect or remove it without affecting the operation.
If you're not showing oil pressure the fuel pump is shut down. The ECM goes thru a priming cycle when the key is turned on. That's enough to start the engine and show oil pressure. Without that circuit being complete the ECM will kill the fuel pump relay. I guess a jumper could solve this but it's just as easy to install the correct oil pressure sending unit.
Race Director
Joined: Apr 2007
Posts: 11,152
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From: South Western Ontario
I agree and dis agree.
If you're not showing oil pressure the fuel pump is shut down. The ECM goes thru a priming cycle when the key is turned on. That's enough to start the engine and show oil pressure. Without that circuit being complete the ECM will kill the fuel pump relay. I guess a jumper could solve this but it's just as easy to install the correct oil pressure sending unit.
If you're not showing oil pressure the fuel pump is shut down. The ECM goes thru a priming cycle when the key is turned on. That's enough to start the engine and show oil pressure. Without that circuit being complete the ECM will kill the fuel pump relay. I guess a jumper could solve this but it's just as easy to install the correct oil pressure sending unit.
Instructor
Joined: Aug 2004
Posts: 106
Likes: 1
Interesting. My GM Shop Manual for my '82 specifically lists a pressure switch that disallows ignition until it reads a minimum pressure (4PSI, If I remember correctly) thus all the extra cranking when the car has sat for awhile before starting. I always assumed it was meant to prime the motor (lubricating cam, lifters, etc.) with oil prior to ignition.