knock knock knock Options

[ncgalant]

Hey guys, I've been playing the the laser just trying to get a better understanding of what the ecu is doing at what point and why. Problem is she knocks and I can't get it to go away. Here's what's going on:

-Into the throttle anywhere from 1500-2700rpms results in 43counts of knock
-The O2 cycles as it should and my fuel trims are all 3 90-110
-Changing gears to raise the RPMs will make the problem go away
-A hard rev will make the problem go away for a minute or two
-At WOT I never see a knock count higher than 2

So what are your thoughts? I'm leaning toward fantom knock.

[fastclipse82]

I like to pride myself on being the dsm knock expert. reason being:

I have a 92 talon that had knock issues, so I replaced my knock sensor, didnt help. Then I noticed a sticky lifter, changed to the 3G lifters, didnt help. I changed absolutely every sensor on the car, didnt help. Timing belt, didnt help. different ecu, didnt help. Motor mounts, didnt help. GM MAS and Translator so I could tune it, didnt help. 3" exhaust, didnt help. No exhaust, didnt help. 550s , new fuel pump, rewire, intake, supra sidemount, 16G, 2G manifold. . . didnt help.

Finally Id had enough. so I bought a new engine to swap out and when I took the old one out Id realized that a tooth on the old crank pulley had broken off and was rattling around under my timing belt and causing 43 counts of knock, which also, gave me about 5 degrees of timing which killed my power.

My advice would be start big. Not small. All of the things I mentioned are culprits of phantom knock. Change the things that are more prone to cause real knock. Also, anytime you have 43 counts of knock I can guarentee its phantom knock. The more knock the ecu sees the farther back timing goes. timing goes too far back and the engine will stall and die. I would do a full refresh. timing belt and components, replace the cam angle sensor, coolant temp sensor, throttle position sensor, knock sensor, O2 sensor, all vacuum lines, egr valve, check your injectors, clean the combustion chamber with seafoam or mccc, check the caps on your ecu and/or have them replaced and replace your motor mounts or fill them in with window weld. If that doesnt work, buy an eprom and get the knock eliminator chip and buy an egt probe and gauge and a wideband O2 setup. The knock eliminator code raises the threshold of when the ecu sees knock and lowers its sensitivity. The EGT is for safety measures. Youll always know if your running too lean or if your getting knock from detonation. The wideband is to tune it safely if you are getting knock from detonation.