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1G Knock sensor code 0031, knock sensor cirucuit malfuntion

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william

20+ Year Contributor
39
4
Jul 21, 2002
Chico, California
Almost complete with a restoration of a 91 Talon. Shop is getting OBD1 code 0031, knock sensor cirucuit malfuntion. The knock sensor was new, but swapped it out with another new one. Same code.
Checked wiring to ECU, no issues there.
ECU was refurbished by ECMLink. They confirmed it was tested and shouldn't be giving a false reading.
The knock sensor isn't over tightened.

Any ideas? Thanks in advance.
 
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