jonnykillpop 10 Posted December 27, 2013 Tested this for ohms at connector plug and getting no reading across across any 3 terminals or one lead to earth and any terminal. Cars running OK but not perfect, seems slightly down on power and revs dropping a bit when going back to idle, but not stalling. Had basically every new sensor, crank, cam, temp., lambda etc., ISV fine, new VW (Beru)coilpack, new Bremi 10mm leads, MAF. Car had new engine shortly before bought it. Only things showed up on Vagcom were Cam sensor (changed),crank sensor (changed) and lambda (changed) hav'nt had on since. All improved it but still does'nt feel 100%. Knock sensor looks brand new, plug, cable and end, VW (Bosch) one 021 905 377, can't be original one looking at it, but if no ohms it's kaput, or not the way to test? Europarts do a FAE one for 43 quid at mo, will this be OK? Places on ebay list 2 alts. for same car, say check chassis number why's europarts only list 1? Quote Share this post Link to post Share on other sites
Dox 23 Posted December 27, 2013 A knock sensor is just a microphone tuned to detect pinking / pre ignition / detonation to prevent engine damage. The block needs to be clean and the sensor torqued to the correct value to work properly. Unplug it and drive the car, if it pinks when unplugged but not when its plugged back in again its working. Quote Share this post Link to post Share on other sites
fla 9 Posted December 27, 2013 sensor torqued to the correct value to work properly. ^^^^^this is key Quote Share this post Link to post Share on other sites
jonnykillpop 10 Posted December 27, 2013 Cheers, there's a CTS just down road just rang can get one for tomorrow for 36 quid, Lucas one I think, for that price just ordered one and I'll stick it in tomorrow, if it's not sensor still means got full set of spares of sensors, coilpack, MAF etc., which can't be bad thing, and if old one is kaput probs keep Lucas one as spare and get a new Bosch one. What's the correct torque, did I read 15 lb ft or something. Should bolt have a washer? Old one does'nt, but looks brand new, still shiny, and not sure it's the standard bolt, just looks like a stock bolt, not VW one and would have expected like one of those washer head bolts or something. Car was extensively restored/rebuilt/uprated shortly before bought it, engine, suspension, body etc. so probs used a new bolt, is bolt type important. Fits fine, and everything been very professionally done so expect is fine. Quote Share this post Link to post Share on other sites
jonnykillpop 10 Posted December 29, 2013 Yep did trick working perfect now Quote Share this post Link to post Share on other sites
