My car seems to have no power lately. I am having constant knock that goes up to 15 degrees. I don't really know how to read the datamaster scan to tell what could possibly be causing it. Anywhere between 1800 and 2800 rpm, the car has no power at all. I really have to push the pedal to get it to go. If i decide to have a mail order programming tune done by madwolf or someone, will they look at a datamaster log before programming? Can anyone here check it out? Thanks for the help.

By the way, I have the LT4KM and always use 93 octane.

I noticed that my O2 voltage readings are nearly never 30mv apart, but usually a couple hundred. One example is 53/786. Any chance that this is causing a problem?

Datamaster file
http://rapidshare.de/files/32678746/home.uni.html


Here is the log hosted at another site. You still have to wait 40 seconds or something, but you don't have to go through multiple pages. I'll see if i can find another site that doesn't have a time limit.
http://www.megaupload.com/?d=KFQGFGNZ

 

The first thing I would do is ditch the LT4 Knock module. Mine gave me crazy knock counts.

Steve

 

Is there any way to donwload the file without waiting forever for the "ticket", then gettting a thousand ad's for upload services? I could never get to the point where I could actually download the file.

Your O2 values will never be the same, nor will they likely be within 30mV of each other in closed loop. Each bank of the engine is controlled independant of the other. At WOT (PE mode) you should see them very close, and relatively steady, but not in closed loop.

Do you have any DTC codes? DTC 43 (knock sensor) will cause the PCM to set its own knock retard values, based on other sensor inputs. You will have almost constant knock retard, ranging from a fraction of a degree to 15 degrees.

 

This is the best link I could find. Has a 15 second wait, then displays the link to the file

http://www.verzend.be/v/3090885/home.uni.html

I have no codes being thrown. I thought I had my mods in my sig, but I have Jethot LT's, Borla exhuast, no cat, and an electric cutout. My exhaust also rattles the shielding that is below the gas tank. Just telling you this because these may be possible causes of the knock.

 

The data log shows DTC 15, low coolant temp. But that must be a stored code, because I can't find it in the log.

 

Sorry, I cleared it after that log. It's no longer there. I replaced the sensor and forgot to clear it.

 

What mods? If none, then the tune isn't your problem.

 

Jethot LT's, Borla exhaust, no cat, electric cutout.

 

Then the tune isn't your problem. Maybe a tune can get you a few HP, but you need to find and fix the problem first.

 

Probably the most knock retard I've ever seen in a data log. I don't think I've ever seen one max out at 15-deg before, after looking at hundreds of data logs.

Have you ever tried using high octane unleaded racing fuel to see if the knock is reduced? Have you tried getting your fuel from a different source?

I don't see anything in the data log that stands out. It is pulling fuel out in most cells, any where from 4% in Cell 15 to 11/14% in Cell 5. And the right bank is always pulling out even more fuel than the left bank, consistantly in all Cells.

TPS, IAC, MAP, MAF, etc. all look normal. The knock count just jumps up constantly.

If higher octane fuel doesn't solve the problem, you need to look for mechanical noise. I saw one case where a piece of RTV had gotten lodged in the end of the knock sensor and was transmitting huge amounts of noise to the knock sensor. Also could be a problem with something like the motor mount that is right next to the knock sensor being damaged or loose. But the knock retard appears in direct correspondence to the throttle opening up.

 

Thanks for taking the time to look over that log. I know it's a big one. Right now I'm just waiting for my gas to run low to go fill it up with some racing fuel. Would 110 octane be better than 100? They are both $8/gallon so it doesn't matter which one I use, just wondering if one would be better than the other for diagnosing this problem.

If the knock is still the same, I will look into replacing the knock sensor in the block. I've got to get this problem taken care of. Anytime you press the gas slightly, it feels like the car is falling on its face. There's a big delay from the time I push the pedal to the time it takes for the car to get moving.

 

110 octane [(R+M)/2)] is leaded. Use 100 unleaded.

 

any updates???
i'm have the same problem

 

Had to go out of town and needed to fill the tank up with 93. I will hopefully get to put the 100 octane in the car this week. I'll definately post back and let you know how it goes.

 

Just to update, I replaced the knock sensor and still get knock constantly. It seems to have toned the knock down some, but I still see 15 degrees.