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1985 town car

MBZ

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I am at a brick wall with this town car at the moment.. its a 1985 with the 5.0 TBI engine. the base timing is set at 10* BTDC. with the sprout disconnected.. and the car will run and idle fine does smell rich though
once the sprout wire is reconnected the ECM will advance the timing to about 20* BTDC. but then ALL HELL breaks lose after about 2 minutes the engine will start shaking and misfiring almost sounds like it stops hitting on all 8 cylinders. I just got this car bought it off a old lady it had been sitting for a while. before she parked it she had a new Distributor installed I'm assuming since its the only Shiny clean thing on that engine. I put new spark plugs and wires on it. I'm starting to suspect who ever did the distributor put it in wrong or maybe the TFI is failing. the TFI module seems to be missing a screw or they over tightened it because it is definitely is not sitting tight against the distributor housing. I do have a scan tool I haven't used since I owned my 91 mark VII. and when I scan the ECM I get the code 18 KOER (sprout circuit open or spark angle word failure) Does anyone know what could be the issue here.
 

Town

Senior Member
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Ottawa Ontario Canada
#2
I don't have any experience with your problem so I googled: Ford OBD1 code 18 KOER. There is a lot of information and some tests that may help you to resolve your EEC problem.

Hopefully someone here with more experience can provide more direct help.

Good luck.
 
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#3
the coil negative lead through a 20K ohm resistor buried in the wiring harness. It allows the computer to detect that the coil actually fired. The only use for the signal seems to be for the computer to flag or not flag code 18.

The resistor is rather fragile. If you've been rough on the harness, it is easy to break the connection. The engine will run fine, but you will get intermittant code 18's if the break is vibration sensitive, or hard code 18's if the break is complete.

The other way you get code 18 is if the TFI is on its way out. The computer may see PIP but not IDM because the TFI fails to trigger the coil. In this case, besides code 18, you would have symptoms of the engine missing, stalling out, or failing to start, especially when hot.

hope this helps!
 
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