Phantom Knock?

[LarryJoe]

So I noticed that while even just cruising out of boost I'm seeing some random and high amounts of knock. I'll attach the log I took from EvoScan. Out of boost cruising on the highway I'll randomly get many counts of knock. I think it's phantom knock but I'm not sure. What do you guys think?

 

[xxNocturnalxx]

Check ther knock sensor, may need a new one.

 

[LarryJoe]

I plan on that today. Does my log look like phantom knock or signs of a bad sensor?

 

[xxNocturnalxx]

That would be the same thing. Phantom knock is just knock not caused by a poor tune or poor fuel but the ECU sees no difference... so to the ECU phantom knock is real knock. Usually false knock readings (phantom knock) are caused by a faulty or melting sensor

If the sensor is fine start with the basics, spark plugs, wires, base ignition timing, target 14.7 afr in cruise.

 

[flawlessTSI]

Make shur the sensor is tight. I had the same problem and wen I went to change the sensor the old one was hand tight.

 

[GRAVEDIGGER]

Check the back of the sensor for the black goo of death running out the back of it first and go from there. I would bet your sensor has gone bad.

 

[LarryJoe]

According to my log what else would cause random knock while steady cruising other than a bad sensor?

 

[Tiki2777]

To much sensitivity. Most ecuflash users have to change the sensitivity in low load expecially evos. There is a writeup somewhere here or on evom. Hope this helps (i get phantom knock on my spool up or partial throttle sometimes)

 

[slayer450]

According to my log what else would cause random knock while steady cruising other than a bad sensor?

I don't know about your log but I just had my egr valve ticking and setting off the knock sensor. It would happen mainly when cruising, 1500-2000rpm. Grab a stethoscope and give it a listen.

 

[LarryJoe]

I have a bad front motor mount. Could that cause it?

 

[xxNocturnalxx]

Not while cruising, I wouldn't think. lifter tick and exhaust leaks will have a better chance at setting it off.