NuclearBacon Posted October 7, 2005 Share Posted October 7, 2005 I recieved a trouble code from the computer saying my knock sensor ...sucked. I had gotten one from the junkyard, and noticed when i replaced it, one had a hole in the bottom *where it sits against the block* and my replacement one did not. The computer didn't like either one. .... has anyone heard of this being a problem? what does the hole do? is there a reason i need one with the hole, or without? do knock sensors go out often? could it be the circuit? its my only trouble code, and after a 3 1/2 month rebuild, this is my only snafu... i'd like to get that stupid light off the dash!... without the use to electrical tape thanks!!! Luigi Link to comment Share on other sites More sharing options...
KStretch55 Posted October 7, 2005 Share Posted October 7, 2005 I have a 91 MT and a 92 AT, both EA82 non-turbo and they don't have knock sensors. Did only the turbo EA82s have them? I know a Legacy I used to have did too. Link to comment Share on other sites More sharing options...
NuclearBacon Posted October 7, 2005 Author Share Posted October 7, 2005 I have a 91 MT and a 92 AT, both EA82 non-turbo and they don't have knock sensors. Did only the turbo EA82s have them? I know a Legacy I used to have did too. yes its to prevent damage. the knock sensor *from what i understand* hears a "knock" and retards the timing on the engine.... thats as far as i know.... Link to comment Share on other sites More sharing options...
torxxx Posted October 7, 2005 Share Posted October 7, 2005 Yes you are correct. Only Turbo'd motors have them. I think there is a one wire knock sensor and a two wire knock sensor and the difference is on the years of turbo EA82s. the early ones had a single wire and the newer ones had a two wire knock sensor. or it could be the other way around. its located on the back of the top of the block below the pitch stopper on just on the passenger side of the middle of the block Link to comment Share on other sites More sharing options...
All_talk Posted October 7, 2005 Share Posted October 7, 2005 I know the early (up to '86, flapper MAF) and late ('87+, hotwire MAF) EA82T's use a different style knock sensor, or at least they look different and the wire connecter is different. My stock '87 has the hole in the bottom, I've got a early one I could check too. If thats any help Gary Link to comment Share on other sites More sharing options...
All_talk Posted October 7, 2005 Share Posted October 7, 2005 Yes you are correct. Only Turbo'd motors have them. I think there is a one wire knock sensor and a two wire knock sensor and the difference is on the years of turbo EA82s. the early ones had a single wire and the newer ones had a two wire knock sensor. or it could be the other way around. its located on the back of the top of the block below the pitch stopper on just on the passenger side of the middle of the block That reminds me... the late style is one wire and the early is two wire, tho the second could just be a ground. The early set up is a stand alone with a vac type distributor, the later set up has the timming retard built into the ECU Gary Link to comment Share on other sites More sharing options...
NuclearBacon Posted October 8, 2005 Author Share Posted October 8, 2005 yeah i definitly have the single wire, and its interesting,.....the one i have now does not have a hole in the bottom, but my old one did... maybe this is my problem... Link to comment Share on other sites More sharing options...
NuclearBacon Posted December 12, 2005 Author Share Posted December 12, 2005 Figured out the problem was a broken wire in the freakin wiring harness... replaced the wire going from the comptuer directly to the knock sensor, bye bye check engine light. YOUR CONNECTION IS ONLY AS GOOD AS YOUR WEAKIST LINK! check your continuity! Link to comment Share on other sites More sharing options...
rallyruss Posted December 12, 2005 Share Posted December 12, 2005 Figured out the problem was a broken wire in the freakin wiring harness... replaced the wire going from the comptuer directly to the knock sensor, bye bye check engine light. YOUR CONNECTION IS ONLY AS GOOD AS YOUR WEAKIST LINK! check your continuity! check engine lights are thrown for a component CIRCIT not an individual component. Good job finding the problem. Link to comment Share on other sites More sharing options...
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