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Fine, here's some more thoughts for you.
The connector on the knock and block temp sensors are physically the same and easily accidentally swapped. Peel back the boot and check the wire colours to make sure you've got the right one connected. Knock sensor on an '89 B230F with EZ 116K ignition should use black and green wires. Temp sensor uses red/black and grey/white.
Check the black and green wires at the firewall electrical connector block (should be at left strut tower brace). Your looking for green and black wires on connector pins 1 & 2. Open the connector and check for resistance on these two pins through the knock sensor. You should see something like 1000+ Kohms. The main thing is it shouldn't be an open (infinite) or shorted (zero) circuit.
Now repeat this check at the ICU (EZK) connector. Pull connnector and open shell (ignition off!!!). Always test probe from rear/sides -not the delicate contacts. You're looking for the black and green wires on pins 12 & 13 (respectively).
This is a low voltage circuit. Make sure all connector pins are fully seated in the connectors (at knock sensor, firewall and ICU). Make sure all contacts are clean (use spray contact cleaner) and weather proofed (squeeze dielectric grease into contacs). For good measure, also push in the opposing back sides of all pins in the strut connector block to ensure a good contact. There were problems with pins sometime back then.
You've checked the grey/red wire from EZK pin 4 to LH pin 29. The other direct connections between the ICU and FCU you might want to check are:
- yellow/grey wire from EZK pin 17 to LH pin 1
- yellow wire to EZK pin 8 from LH pin 25
- the orange wire to EZK pin 7 from LH pin 2
. (goes through the throttle switch connector)
- the brown wires from EZK pin 3 and from LH pin 22
. (goes to check engine lamp)
It is possible that the knock signal is getting lost at the EZK circuit board. Re-soldering this board has been mentioned as a fix, but it may not be worth the effort unless you can absolutely isolate the problem to the EZK unit (like by swapping in another one).
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