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Heh again--- car had about 165k on her before I started to take notice of the knock sensors, also I had just gotten rid of my prize 66 7 litre 427 side oiler ford ( galaxie with a 427 AC Cobra engine from the factory 2 four carbs pushing 527 horse with 535 ft lbs of tourqe) that car was sold to keep my young son out of her and the Volvo is going to be his this year. I don't know how far the car had gone like that, but when I didn't have my ford to stay into I had for some reason to look for other avenues to keep my interest.
I've got to say though that selling the bad ass Ford did help me to go to working into areas that I had thought I never would, Fuel injection is really simple in some regards to fully tuining multiple carbs and the brickboard has helped a great deal in that education.
In total responce to your question though, the knock sensors can go bad from a number of problems, over tourque,contamination from petrol or byproducts or just old age.
If you do replace them Dewfpo has stated that they have positional chariteristics to be taken into play, if I remember the back sensor must be placed at 3 oclock and the front one at 5 oclock ,both tourqued at 12 ft lbs
I've also read that the sensors can be disabled sometimes by a faulty alternater, giving off magnetic interference that will throw the sensors off. What was said there, was that, there would need to be some type of sheild to keep the alternater from disrupting the knock sensor. There is a magnetic feild that causes this and belive it or not the use of small gauge screen mesh will stop this from happening by cutting it just large enough to cover the sensor and then grounding it. I don't know any more, hope that helps, the burbon is taking over now, one last note , bought the new sensors from FCPGroten at about 40bucks each. Burbon has a good hold now for sure--------------------
Poolman
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