Im not lean and with low timing I still have knock

[Mph]

I have low timing and I am running pretty rich. I can do a pull 1st - 4th staying in mostly high RPM's and it wont sputter or give me a hard time. But when I do a pull in any gear besides 1st and start at 3k it will knock and run crappy.

Here is a log:

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[talonsteve25]

How much boost are you running and do you have a wide band you can log and what kind of fuel? I know from my car that on 94 pump gas at 24 psi i can run 10.5-10.8 a/f but i have considerably less timing then your map.

 

[SOADweskey]

Please answer all of Steve's questions. As they will help people diagnose this. From a quick look at the log it seems almost like phantom knock.

In addition to his questions, how is the knock sensor (is it tight, age of sensor)? And what are compression test results form the engine (I had knock at low boost like that from a piston that had broken ring landings and obviously lower compression than the others).

 

[JayRolla]

Agreed it may be PK, but like stated you must answer if you have a wbo2, what AFR's are seeing, compression ratio and how much boost.

Rev the motor at idle out of gear and see if it still knocks. If you get lots of knock and your motors not under load its most likely phantom knock (PK).

 

[Mph]

I am using 93 pump gas. Last time I checked compression was fine. I do not have a wideband gauge. But I am almost positive it is not running lean at all. The knock sensor has never been changed, that I know of. But before I put the new turbo on it ran perfectly fine. I am at about 15 PSI.

 

[SOADweskey]

You really should get a wide band and have it logged in DSMlink. According to your profile you are using a serious turbo and according to the logs it is flowing up to 29 lbs/min even at 15psi which is the same as I was getting from my old B16G at 21psi.

I would reach behind the block and feel the knock sensor to see if it is loose or if it has goo coming out of it.

And I really wouldn't keep trying to tune the car without actually knowing the air fuel ratio.

 

[Mph]

You really should get a wide band and have it logged in DSMlink. According to your profile you are using a serious turbo and according to the logs it is flowing up to 29 lbs/min even at 15psi which is the same as I was getting from my old B16G at 21psi.

I would reach behind the block and feel the knock sensor to see if it is loose or if it has goo coming out of it.

And I really wouldn't keep trying to tune the car without actually knowing the air fuel ratio.

Oh believe me I am trying to get a wideband, but funds are limited. I also want to install the wideband with a new downpipe and test pipe.

I have looked at the sensor and it is clean, and doesn't looked damaged at all.

Tuning without having an accurate A/F read is unsafe, I know. Just trying to get things figured out witht the knock. I do have my CEL come on at 3 degrees, and when I see that light come on I let off the throttle.

I was just thinking causes of this knock from the wires/spark plugs, to the stock downpipe, to my CAS. I just am trying to narrow things down.

EDIT: I actually just checked my knock sensor and it does have some black glossy goo on the back of the sensor!

 

[talonsteve25]

yeah because with the stock maps and only 15psi knock should almost be none exsistant. I bet it was that knock sensor, but you could turn down the boost just to be on the safe side for now.

 

[SOADweskey]

EDIT: I actually just checked my knock sensor and it does have some black glossy goo on the back of the sensor!

I have never had it happen to me but I have been told that it is for sure a sign of a dead or dying knock sensor.

Here is the best picture I have handy of what a good knock sensor should look like. It is hard to see but you can tell that the back of the sensor is just a black rubber piece.

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[Mph]

15 PSI is the lowest boost I can push with my wastegate spring. Also, the black goo on the back of the sensor almost looks like insta-gasket. I could try replacing it though to see if that helps.

 

[JayRolla]

Once the black goo starts to come out the knock sensor is bad. Replace it, thats most likely your issue.