Why is my car knocking at randomly rpms?

[pahlai]

Well guys, I logged my car numerous times today and found out that I have knock. The knock isn't consistent, it appears at random rpms and random gears. Sometimes it will show up in 2nd and 4th and sometimes it won't show up at all in both gears. But its pretty consistent in 3rd gear. When it shows up in 3rd, the rpms it shows up in isn't consistent. I'm starting to think my exhaust could be too loud because i have dual cutouts on my ory or my y pipe is hitting the floor board. what do you guys think? check out my logs and let me know what you think

thanks, Toua

[racerx203]

Well guys, I logged my car numerous times today and found out that I have knock. The knock isn't consistent, it appears at random rpms and random gears. Sometimes it will show up in 2nd and 4th and sometimes it won't show up at all in both gears. But its pretty consistent in 3rd gear. When it shows up in 3rd, the rpms it shows up in isn't consistent. I'm starting to think my exhaust could be too loud because i have dual cutouts on my ory or my y pipe is hitting the floor board. what do you guys think? check out my logs and let me know what you think

thanks, Toua

Yes i think it's false knock. Make some adjustments to your knock sensitivty table. Raise the number up.

[pahlai]

Yes i think it's false knock. Make some adjustments to your knock sensitivty table. Raise the number up.

ok thanks for the reply but i'm a newby with hp tuners so i don't exactly know how to do that... lol can some one elaborate, please?

[evotune5]

spark/knock sensors/knock sensor level

then initial level and min level. Do a % change. Example (x 1.30) for 30%. higher number, less sensitive..

[pahlai]

spark/knock sensors/knock sensor level

then initial level and min level. Do a % change. Example (x 1.30) for 30%. higher number, less sensitive..

thanks, any other suggestions?

[pahlai]

Yes i think it's false knock. Make some adjustments to your knock sensitivty table. Raise the number up.

spark/knock sensors/knock sensor level

then initial level and min level. Do a % change. Example (x 1.30) for 30%. higher number, less sensitive..

Under "knock sensor tip in" I see a min tps, is that where I raise the number to decrease sensitivity? I don't see a initial level, I'm assuming it's the same as the min tps?

[pahlai]

Bump for answer

[pahlai]

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[tpcaz]

Not knowing if you have dialed in your VE table and MAF (if you are using one) first before adjusting timing, I will assume you did.

Looking at the data in your scans shows knock at the higher RPMS, and then looking at the timing histograms the timing is pretty high. I'm guessing the timing tables are stock (which tend to be a bit on the high side anyway).

Since your knock retard is only a few degrees at most and occurring in about the same cells, if it were my car, I would copy the knock retard data and then subtract it from my timing table. Then I would rescan under the same conditions and review the results to see if the knock is still there or not. I would also try to do a scan with more data (try to populate as many cells as possible) to ascertain if knock is showing up anywhere else.