+1 i read this post all the way to the end and didnt want to double post.

i think that it could also be phantom knock but i think someone should log it to fing out the truth!

 

If someone wants to end the debate whether its the MAF or the knock sensor, someone should log MAF and knock sum in EvoScan when dropping the hood.

 

its knock sensor....ever notice when like a z28 or cobra or soemthing with loud exhaust is in front of you and revs on you. your engine stumbles a little....same thing....deffinately knock sensor its normal and happens to everyone with an evo

 

I went outside.. tried it.. didn't happen to me...

 

Outside engine noises will not affect the knock sensor. The ks is bolted to the engine block, its designed to pick up certain frequencies/vibrations from the motor internally that could be signs of ping or knocking.

Loud sterio systems, hoods slamming down, or muscle cars next to you will not affect it. A sledge hammer wacking the sensor is another story.

Sound waves are vibrations of air. No air = no sound and no vibrations felt. Only thing that can be affected by sound waves that will not burst your ear drums is the maf sensor. If the the maf is sensitive enough to get disrupted by tapping it, then it surely will get affected by sound and transferred vibrations.

Only exception to the rule is if our knock sensor are actually that sensitive. Which is unlikely unless you drive a 02-03 Nissan Sentra SE-R Spec V. And those cars knock sensor would be affected a tad bit only by header, and balance shaft removal. Outside factors never disrupted it and the header/bs removal only affected like 3-7 hp max. (but they put only 145 whp so every bit counts)