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Joe in answer to one of your questions the unit is affected by background noise. I think it raises the peak in other words if background noise is 1V then the peak will be increased by 1 V causing the problem. The real test would be to plug into the right knock sensor just behind the alternator on the two types of engines and see if they are getting different peaks. If some one had a dead knock sensor and a dead harness they could make a short lead to plug inline with the ECU and you could run the tests to your hearts content.
You guy most likly know but the knock sensor generates its own power and appears to go from negitive voltage to positive, -4v to +4v range so you just put one lead of the scope on the engine and the other on the output wire of the knock sensor and you have power.
If you use washers remember that the sensor needs to be grounded to the engine (Neg) to operate so you could put fiber washers under it as long as the bolt makes contact at the top.
Tony
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1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX.
1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC)
1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car.
1995 - SVX Green low k mint condiation.
1995 - SVX Rally car, ex Matts car. Now to be used on track.
1992 - SVX red & Black being converted to Mid Engine.
1995 - SVX Red 143,000 bit rough.
Owned 5 others Subaru back to a 1974 1400 GSR.
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