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Old 09-09-2019, 02:18   #1
Rui_N
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Arrow Knock sensor triggering check engine light

Hi, I have a 1992 cb5 Lancer gti (engine 4g93 dohc).
The car has stored a knock sensor code (code 31), but there seems to be no knock occurring. The strange part is that the check engine light only appears between 3k and 4k rpm and goes away past those rpm, also doesn't appear at WOT.
Does this seem like a knock sensor problem, ecu or none of those?
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Old 09-09-2019, 07:31   #2
super rover
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have you recently used differant fuel

or is something like the exhaust catching on the underside ,daft as it seems something touching the engine causing a vibration or rub can trigger the knock sensor
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Old 09-09-2019, 09:57   #3
Rui_N
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Already ruled out fuel, does it with every fuel that i've tried.
As for the exhaust or something of that kind i don't believe that's the cause since i can't hear any rattles when driving and also the car is 100% stock..
The only thing that i can think of is that i have a little bit of lifter tick, but it goes away few seconds after of a cold start, and doesn't seem to be present when driving but do you think this could be interpreted as knock from the sensor?
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