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Oil pressure sending unit location and more

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Old 10-08-2008, 03:53 AM   #1
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Default Oil pressure sending unit location and more

So today I bought a new sending unit to eliminate my red "engine" light. I made sure to order the one for the warning light, not the gauge. According to the manual online at Autozone this is located just to the left (or in front of) the oil filter. I spent at least 3 hours trying to get the old one off, unsuccessfully. I tried sockets, vise grips, etc. No socket fit. 1" was too small, 1 1/16 too big. I destroyed the old sending unit. Then when I started the engine to see if the old one leaked after all my destruction, the red "engine" light was still on and the gauge didn't register, telling me that either the wires are plugged into the wrong oil sending units, or I was working on the wrong one the whole time, thanks to the Autozone online manual. So I have several questions:

1. where the heck is the second sending unit (the one not to the left of the oil filter, looking from the driver's well)?

2. which one is which (gauge and warning light)?

3. How the frak do you get the damn thing off without a 1 1/32" socket (which I've never seen)?

Help would be GREATLY appreciated!

BTW, it's an 87 w/302

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Old 10-08-2008, 08:49 AM   #2
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There is a socket you can buy for the sending unit. But that is the only oil sending unit on a 302. Not like the temp sending units on EFI motors, tha has one for gauge and other for computer.
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Old 10-09-2008, 10:09 AM   #3
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The engine light comes on from low oil pressure,or high engine temp. w/o either present leaves the third reason assumeing warning module unit itself has not failed(Least likely):Failure Mode Effects Management

FMEM is an alternate system strategy in the ECA designed to allow improved vehicle drive should one or more sensor inputs fail.
When a sensor input is perceived to be out-of-limits by the ECA, an alternative strategy will be initiated. The ECA will substitute a fixed in-limit sensor value and will continue to monitor the faulty sensor input. If the faulty sensor operates within limits, the ECA will return to the normal Engine Running mode (strategy).
Code 98 will be displayed when FMEM is in effect.
The MIL `` Engine'' light will remain ON when the FMEM is in effect. The moral of the story: Run a KOEO & KOER scan. " ...And thy Scan results shall set you free" (Well, at least your know which sensors to replace. Start on sensors with actual "Failure" codes. a failed sensor can cause others to show "Out of range" errors. I 'm pretty sure my 87' 302 only has the one sender unit you were beatin the s**t out of, above & in front of oil filter. Note: I think the aerostar had something like you described that year, although someone forgot to mention its existence in the owners manual. Wild guess? Your ECT sens/switch aint reportin for duty. Also, The engine lite was the predecessor to today's CEL which in the beginning was easily and simply taken care of with a 1 inch piece of well positioned black electrical tape. 2 inches if it aslo bugged the passenger too.

Last edited by ymeski56; 10-09-2008 at 10:23 AM.
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Old 11-03-2008, 04:25 AM   #4
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Thanks very much for your reply. I really appreciate the detailed explanation.

Talk about stupid - the reason that I thought that there were two different oil sending units was because when I went to the parts store and asked for one they asked me " light or guage?". I of course replied light, since that's what I thought wasn't working. I bought a useless sending unit before I figured it out.

The first thing that I replaced when I got this truck was the ETC (temperature control) sender, or whatever it's called. That totally fixed the most serious errors. I ran both of the tests after that and the only thing that seems to be indicated is the EGR valve. I still have the red "engine" light. I have no idea why. The engine actually runs really nice.
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Old 11-03-2008, 09:30 PM   #5
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The "engine" light has absolutely nothing to do with the computer. It is not the predecessor to the "check engine light". It is simply an idiot light that illuminates when the oil pressure is low or the water temperature is high.
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Old 06-21-2009, 05:03 PM   #6
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10$ at autozone for the socket results in no problems for removal,the socket is deep well and has small grooves in the side walls to fit the unit
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