Tyson Josh Posted January 29 Share Posted January 29 Recently I have been doing some fixing on my 87 Comanche. Inline 6. 4x4. Long bed. Automatic. I replaced passing gear cable , installed electric fans and removed manual fan. New plugs, wires , rotor, and distributor cap. New oil and filter. ( Not a fram) My oil light has come on . I went through my book it's a Haynes and there's nothing in there defining like where my sending unit or signal comes from I'm not very sure on how to check my oil pressure because it's just a dummy light on the dash so I know how to work on cars and I'm somewhat savvy with it but I'm not very electrical familiar any help would be appreciated where to start what to look at. Link to comment Share on other sites More sharing options...
jdog Posted January 29 Share Posted January 29 Verify the senders hooked up, it is next to the oil filter or right below it Link to comment Share on other sites More sharing options...
89 MJ Posted January 29 Share Posted January 29 The passenger side of the block near the oil filter is where the sender is. Pull that sender and verify with a mechanical gauge to know what your pressure actually is. How long did you run it for? The oil filter needs to fill up to build oil pressure, but that should only take a few seconds. What kind of oil did you use? These trucks called for 10W30 when new, make sure you used something at least that thick. Link to comment Share on other sites More sharing options...
Tyson Josh Posted January 29 Author Share Posted January 29 I did look for the sender. There is not one by the oil filter. There is a brass fitting there and a port that is plugged off where one , I believe, should be . But there is nothing there. Link to comment Share on other sites More sharing options...
Tyson Josh Posted January 29 Author Share Posted January 29 I use 10w30 high mileage full synthetic Castrol. I let the truck run 3 or 4 min. Link to comment Share on other sites More sharing options...
89 MJ Posted January 29 Share Posted January 29 Ok. Sounds like your oil light is caused by not having the sender in it. That’s a pretty easy fix. Link to comment Share on other sites More sharing options...
llhat Posted January 30 Share Posted January 30 do you see the connector? Is it unplugged? I cannot recall if the sender grounds out when zero pressure, illuminating the light... but that may be the case. Link to comment Share on other sites More sharing options...
Gojira94 Posted January 30 Share Posted January 30 If you have a round pigtail with an offset single blade terminal, Wells PS117 is available at most parts stores. Autozone re-packages it as Duralast red/blue box. $10.00. PS117 Link to comment Share on other sites More sharing options...
Tyson Josh Posted January 30 Author Share Posted January 30 I could not find any thing around the filter or distributor. I know the book shows there to be one but mine does not. I have had the truck for 10 years. Never had the light come on before. Could it be on the other side of the motor? Truly has me stumped. have not been able to find any diagrams that might label what I'm looking for Link to comment Share on other sites More sharing options...
Tyson Josh Posted January 30 Author Share Posted January 30 I will look for this pig tail this evening after work. Link to comment Share on other sites More sharing options...
Tyson Josh Posted January 30 Author Share Posted January 30 I have not found anything unplugged or dangling wire harness .... Link to comment Share on other sites More sharing options...
Ωhm Posted January 30 Share Posted January 30 2 hours ago, Tyson Josh said: I have not found anything unplugged or dangling wire harness .... Below the ICM COIL secondary high voltage tower there's a spade connector. Is anything plugged into that. LT BLUE wire maybe. Link to comment Share on other sites More sharing options...
ThatJeepGuy Posted January 31 Share Posted January 31 I googled for a reference photo as I don't have a renix block to put my eyes on. Indicated by the crude red pointer is where you should expect to see the oil pressure sender Link to comment Share on other sites More sharing options...
Tyson Josh Posted February 4 Author Share Posted February 4 I believe I have found it. Two wires going to it and a completely bare wire. All three wrapped in a paper thin foil wrapping. It is on the driver's side. Screws in right above the seal of the oil pan. Plastic was dry cracked and the wires were dry and exposed. Link to comment Share on other sites More sharing options...
Tyson Josh Posted February 4 Author Share Posted February 4 4 minutes ago, Tyson Josh said: I believe I have found it. Two wires going to it and a completely bare wire. All three wrapped in a paper thin foil wrapping. It is on the driver's side. Screws in right above the seal of the oil pan. Plastic was dry cracked and the wires were dry and exposed. Link to comment Share on other sites More sharing options...
Tyson Josh Posted February 4 Author Share Posted February 4 Tried to attach a pic but could not get it to add file. My Apology. Link to comment Share on other sites More sharing options...
Tyson Josh Posted February 4 Author Share Posted February 4 On 1/30/2025 at 6:01 PM, ThatJeepGuy said: I googled for a reference photo as I don't have a renix block to put my eyes on. Indicated by the crude red pointer is where you should expect to see the oil pressure sender No I do not have a light blue wire on that center connection. Only a yellow wire. Link to comment Share on other sites More sharing options...
Tyson Josh Posted February 4 Author Share Posted February 4 And there is no sending unit where your pointing at. There is the block with a plug screwed in it. Link to comment Share on other sites More sharing options...
Tyson Josh Posted February 4 Author Share Posted February 4 Just now, Tyson Josh said: And there is no sending unit where your pointing at. There is the block with a plug screwed in it. Try to attach pic but it tells me I have low memory and cannot. Link to comment Share on other sites More sharing options...
ThatJeepGuy Posted February 4 Share Posted February 4 7 hours ago, Tyson Josh said: And there is no sending unit where your pointing at. There is the block with a plug screwed in it. That block with a plug in it is where the sender is to be installed Link to comment Share on other sites More sharing options...
Tyson Josh Posted February 4 Author Share Posted February 4 Link to comment Share on other sites More sharing options...
Tyson Josh Posted February 4 Author Share Posted February 4 Link to comment Share on other sites More sharing options...
Ωhm Posted February 4 Share Posted February 4 Knock Senor (KS). Threaded hole is KS location. Link to comment Share on other sites More sharing options...
llhat Posted February 4 Share Posted February 4 this a mail jeep (right hand drive?) I see steering linkage in the image of the threaded port ... but no oil filter housing... the oil filter housing and pressure sender on other side the image in post above sows a sending unit for something, in really bad shape with the melted housing. edit: I see OHM has identified the sensor... Link to comment Share on other sites More sharing options...
Tyson Josh Posted February 4 Author Share Posted February 4 7 minutes ago, Ωhm said: Knock Senor (KS). Threaded hole is KS location. Thank You for the ID. Again there is no sending unit at the oil filter. I will take some more pics after work and put them on here tomorrow. again thank you. Link to comment Share on other sites More sharing options...
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