Knock sensor location help and wiring.

For any who are curious the carb is a 4010 model Marine 600cfm 69 primary jets 76 secondary 6.5 power valve in the primary only and a .026 squirter.

Found that out from holley.

Also I found a spot on the passenger side head where the knock sensor fits beautifully! Dont know how i missed it or the guy who did the heads. But was the knock sensor being on the intake manifold worsening performance? And what is to be gained by it being on the head?

i did a little more research. the knock sensor "listens" for pinging when the computer advances the timing so when it detects pinging it know to retard the timing slightly. so yes the knock sensor is very important.

also. UPDATE! somehow i missed a threaded hole on the back of the passenger side head right in the same spot as N2Deep. the knock sensor fit perfectly. dont know how the guy who did the heads missed that unless Supra had pcm do something else specially which requires the sensor to be on the intake manifold and the guy put it right back where its supposed to be. but we got done mounting up the "muffler" after repairing it tonight and tomorrow we will be running it for the first time in 2 years!! cant wait to hear how loud its gonna be hehe ;)

actually no we will not be installing the retro fit kit any time soon. we want to keep the electronic ignition working as long as possible. if we have to we will take it to an electronics specialist for it to be repaired if need so. but i now have the sensor where it should belong and the boat was running beautifully! she is loud with dual 3.5" stainless exhaust and the "muffler" on the back of the engine is completely hollow so it makes the boat louder through resonance.

the 4010 is working fine. after running the boat for the first 30 min after sitting for 2 years out of no where the secondary jets just started pouring in fuel! so i took both needle and seats out, sprayed them with carb and choke cleaner, oil the o-rings with a little 30w and set them back to 3 threads and all is fine now.

but from what i read the 4010's smoke the 4160's of the same exact size in acceleration. this carb has always worked great except for one summer which it got immediately rebuild and fixed. but i hear these carbs are very touchy. as they can sometimes work great for a little while and then run like crap for no reason.

Sounds like it's running very well.

As far as the carb, as long as it runs well for you, and you know how it works, that's all that matters. It looks like the rebuild kits are still available for them.

As far as the Protec, I always did find it interesting that the common solution is to just pitch the whole thing. Not sure which exact component it is that spells death.