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Originally Posted by jimh
'95, 350, 2 wheel drive - I'm getting SES with code 43. I replaced the knock sensor and the "single wire" and connector seem to be in good shape. The wire disappears into a wiring harness, then into a heat-shield tube connected to the bell housing. I don't know where that wire goes after that. Straight to the ECM? I've searched around and I still don't know how this sensor works. Haynes manual says it should supply a 8-10 volt signal when no knock is detected. Where does the voltage come from if there is only 1 wire?
Anyway, since it's running sluggish, I believe that the ECM is retarding the timing as it is supposed to (I think). What is the best way to test this connection, where is the other end of the dark blue wire, is this the voltage I should be looking for, etc.???
Also, the water pump is squeeling pretty bad. I am replacing that tonight. Is it possible that the sensor is picking up that noise and making the ECM think that there is a ping going on? Just a thought.
p.s. I hear no pinging, but then again, the water pump could be drounding it out.
Thanks in advance to all that will help me.
Jim
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Knock sensor wiring goes into VCM/PCM.
Best way to test is to watch the reading on a good engine capable scanner.
Tap on the block or head and you sould see it kick in and retard timing.
MT