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Posted by John vdP (93SE 5-sp) on June 05, 2002 at 21:09:20:
I have a strong believe that this has a lot to do with the hesitation problem many of us are struggling with. RosenKen "fixed" it by advancing the timing. I tried the same and it helped. However, if the knock sensor just keeps retarding the timing, we are just compensating for that, not eliminating the problem at the root. Now, here is a two prong idea. The reason I post it before trying it is that I will be limited in time for weeks to come. The knock sensor is buried fairly deep, but the main connector is not! 1. Does the knock sensor have an expected resistance or impedance? If so, we should be able to wire a resistor of that value over (cleaned) external connector. This will no longer send knock signals to the ECCS, but it will no longer set the safe mode either because it thinks the KS is malfunctioning. It's kind of like grounding your VTCs. If this does not work, a new KS (or cleaned one from a parts car) can be mounted externally, even mounted to the block at the different spot. Again it would not function as intended, but it will send clean signals to the ECCS. When I advanced my timing, the engine now occassionally will ping (87 octane, very low rpm). To me it is clearly audible. I guess if you have very high rpm knocking under wot, that's when the KS is supposed to do its job and you could use its help. To do it right, you will have to disassemble the intake, but to test the theory, I believe these easy steps may reveal some interesting findings. If you do it, please share. I will,....eventually, get to it myself. Cheers,
Every once in a (long) while there is a good thread on the org, and the one on the knock sensor, which Matt promoted to a sticky, is one of them.
John