The infamous ENGINE light
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Junior User
Joined: Apr 2008
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The infamous ENGINE light
I've got a 1988 F250 7.3L IDI 4x4 and the engine light is on. I looked in the manual and it shows a self test input connector having a BLK/WHT wire going to it and then another test connector with WHT/RED and PNK/LT GRN wires.
I'm looking under the dash on the drivers side and the only connector I can find is one with a ORANGE/BLK wire.
Under the hood I found a connector with WHT/RED and BLK wires.
Could these be what I'm looking for and what kind of risk is there in running the diags if these aren't the correct wires.
I'm looking under the dash on the drivers side and the only connector I can find is one with a ORANGE/BLK wire.
Under the hood I found a connector with WHT/RED and BLK wires.
Could these be what I'm looking for and what kind of risk is there in running the diags if these aren't the correct wires.
Senior User
Joined: May 2008
Posts: 449
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From: Americas' hat (Canada)
I know I don't have a check engine light.
If you are talking about your OBD 1 connections, they should be on the drivers side right by the firewall.
If you are using an OBD 1 scanner, you should be able to easily insert the wires into the scanner.
If you are using a volt meter, just test it out.
I don't see any harm in the attempt.
If you are talking about your OBD 1 connections, they should be on the drivers side right by the firewall.
If you are using an OBD 1 scanner, you should be able to easily insert the wires into the scanner.
If you are using a volt meter, just test it out.
I don't see any harm in the attempt.
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Junior User
Joined: Apr 2008
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I don't think the OBD connectors came around until the 90's. According to the manual this s one where you make a connection and the engine light will flash a code explaining what the problem is.
This has really got me puzzled. Anyone out there have experience doing this on an 1988?
This has really got me puzzled. Anyone out there have experience doing this on an 1988?
Senior User
Joined: Jun 2004
Posts: 477
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From: florida
My 91 has the light on since i bought it. i had changed the temp and oil guages and i bet thats what set it off. I pay no attention to it.
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Postmaster
Joined: Mar 2002
Posts: 3,545
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From: Coal Region
these trucks are mechanica...no computerl, so the engine light is set off by the oil pressure sendor or temp sending AFAIK.
obd-1 was on gasline engines...i think the PSD had thier own set of codes.
obd-1 was on gasline engines...i think the PSD had thier own set of codes.
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Junior User
Joined: Apr 2008
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I took a look at the temp and oil sensors. The temp sensor looked newer so I tested the oil pressure switch and sure enough it tested bad. I just replaced it (only $8) and the infamous ENGINE light is out! 
Elder User
Joined: Jan 2008
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From: Guymon
Wow, I learned something!!! Nice to know. i would have never guessed that it actually monitored those sensors. Does your engine light normally turn on when you turn the key on then go off. I just turned my key on and I guess it don't light up cause I couldn't find it.
