514_evox

Hey guys.

So I have been having this problem for quite a white now. I have random knock while accelerating on the highway (3rd/4th/5th) at any rpm and when I do pulls in 3rd it usually is at 6k rpm or so. Now I had my tuner check it out, he can not pin point the issue.

My car is a 2008 gsr with the new timing chain, I changed the oil valve (exhaust). I have full bolt ons with Id1k, Aeromotive 320, gtx3576 on stock block (so far). My clutch is an ACT HD-SS and a Streetlite flywheel. I run a Synapse DV with push config.

Knock seems to be random, usually while driving then accelerating, or 3rd gear pulls. 2nd gear has no knock. I attached a log here for reference, any help is appreciated!!!!!!!!!

4b11slayer

That seems pretty consistent. You need to make sure its real or phantom knock.

Could be knock sensor sensitivity adjustment or real knock.

4b11slayer

Is the car tuned or are you tuning it?

514_evox

I am having it tuned by someone very experienced with Evo's, but wont name them. I have no way of determining if it's actual knock or not, no one around here has det cans or good evo x knowledge

4b11slayer

The tuner should be able to identify true vs false knock

514_evox

from previous conversations it seems to be phantom, but he doesn't want to tune me because of possible issues and engine blowing......so I need to find a way to get rid of it. He also doesn't want to desensitize it

4b11slayer

That sucks that your own tuner doesnt know how to tackle this task.

I have that same clutch on my car and also experience knock down low.

Jaraxle

When I was hunting for real knock, the tuner had a drum of some crazy high octane (non lead) fuel. We dumped it in and the knock was gone. This was over a decade ago (Eclipse). That meant it was real. I could have pulled some timing across the board and checked if that made a difference. I am also confused why your "pro" tuner didn't try these things (or did he?)... she?... You can drop your load targets (boost) as well and see if it remains. Now I looked at your log, and I would try to address each "section". For instance focus on off/low boost (under 140 load) and see if you can get rid of it there. Once the ECU gets knock on the brain, it lets go SLOWLY !

Here is my under 140 load timing tables. Use at your own risk, but I do see that your running even higher timing when the knock starts. My fuel is 93 octane, no mivec changes. Try playing around with these values if you like:

roni4g63

iTrader: (1)

sorry but this makes no sense, very experience and cant figure out if its phantom knock or not.. He can just pull a few degrees of timing and see if it goes away for a start, that will not blow your motor.. goodluck

514_evox

Thanks for the info guys, like I said, it's an e-tune. I'm in canada and he's in the USA. I will talk to him and ask to pull some timing. I will also try the high octane...hope it helps :/

4b11slayer

Ive been fighting low end knock also that isnt consistent every pull but it happens from 3k-4000 and can be any were in between.

Alot of people suggest egr hose popped off and sure enough today i found my egr line popped off, no codes no warnings.


Check your vac lines behind intake mani