1997 FZJ80. Here are the symptoms:
1) Pinging while cruising at highway RPMs in warmer weather.
2) Pinging stops when you let off the gas slightly or slightly give it some gas (both of which I believe are manually triggering timing adjustments).
3) No CEL
It's been doing this for a while. I'd like to know if anyone has experienced these symptoms and they turned-out to be caused by a malfunctioning knock sensor. If so, I'll go after the sensor(s), but every thread I've read regarding knock sensors involves CEL signals or broken wires, neither of which I have. My thoughts are that the ECU thinks the sensors are working fine but at least one is not sending any knock signal.
Carbon/EGR stuff has been cleaned out recently, so I don't think it's likely to be carbon pre-detonation.
Any ideas?
1) Pinging while cruising at highway RPMs in warmer weather.
2) Pinging stops when you let off the gas slightly or slightly give it some gas (both of which I believe are manually triggering timing adjustments).
3) No CEL
It's been doing this for a while. I'd like to know if anyone has experienced these symptoms and they turned-out to be caused by a malfunctioning knock sensor. If so, I'll go after the sensor(s), but every thread I've read regarding knock sensors involves CEL signals or broken wires, neither of which I have. My thoughts are that the ECU thinks the sensors are working fine but at least one is not sending any knock signal.
Carbon/EGR stuff has been cleaned out recently, so I don't think it's likely to be carbon pre-detonation.
Any ideas?
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