After rebuild, intermitent engine light... NEED HELP

[moparmadd]

Ok so about 3 or 4 weeks ago I just got done rebuilding my 1991 Talon TSI AWD. The bottom end now has eagle H-beams and 9:1 wiseco pistons. The block was decked but only to clean a few scratces off. The head was also milled all 3 sides but again, just enough to clean any imperfections. I upgraded the injectors to Precision Turbo 550's. Of course the exhaust manifold was cracked so I upgraded tp a UPC Tubular manifold. Replaced the O2 sensor since it was getting .9 of a volt and the wiring was somewhat melted from before. Also installed polyeurethane motor mounts. Right now the new motor has 1000+ miles on it

Now for the problem... Under high RPM boosting or cruising above 75 mphthe engine will kick the the MIL and have a "31 : knock sensor" code. It goes away if you let off the gas and slow down. If i cruise at 70, it won't kick the code. I dont have a manual for a 91 so Im not sure if thats just saying its a bad knock sensor or its tripping the sensor. The EGR is still installed as I was afraid with the higher compression might raise the combustion chamber temp too much. I heard something about "phantom knock"? I have no clue what it was about, I merely heard it in passing and thought it might relate... THANKS FOR THE HELP!!!

 

[missouri_dsm]

make sure your knock sensor is screwed into the block good and tight first. It is located under your intake manifold. then feel the backof the sensor. If it feels sticky or gooey feeling it is probably a bad sensor and you need to replace it.