Well I finally got some time to get my data logger working and learned how to log, download to my computer and covert to an excel file. So now I

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93 3000 GT VR4

Before I tell you what the problem could be, I just want to confirm that the knock ONLY HAPPENS when you shift gears correct?

Don't worry about running rich. I'll explain that later too.

No the knock is during acceleration in 2nd before shifting into 3rd. After fixing the boost leaks I could tell boost was definately better. As far as the knock sometimes its low and other times it could hit the 20's for a brief second. As you pretty much know the car is stock and I never race it. Every now and then I may kick it down between 2nd and 3rd but thats about it. So the knock I'm getting is not at high speed.

Greg, thanks again for your help on how to work my data logger. Now that I figured out how to download and covert the logs to excel its interesting to look at them and see just what is happening.

Adam has explained a lot to me of how the system works and why I should be running rich because of boost leaks. Now the fun part is to figure out why I'm getting this knock.

Kyle

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93 3000 GT VR4

This is going to sound crazy, but I want you to do a 100% throttle run thru 2nd and 3rd and see if it gets any better/worse.

I'd also like you to post the logs here if you can figure it out. It should export them as a .txt file which you can just copy and paste in a post.

2nd to 3rd WOT.....sounds like its going to be fun. I will check on how to convert an exel to a .txt file. Not sure if I will get a chance to do a log tonight.

Thanks
Kyle

Edit: I did figure out how to save the log as a .txt

Now the reason for a WOT log is because the O2 sensors are not used at WOT? Also is it true that the ECU can record up to 48 counts of knock. If its over that then its fake knock? Just some things I have found looking at posts about knock. Should I also look at the PCV valve to make sure its working properly? Thanks for all the help!

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93 3000 GT VR4

Well I didn't have time Monday night to do any logging. Tuesday I was home with my 3 year old son with a cold. I also am starting to get it. I came into work tonight to check a few things and my emails. I did a few runs and can post them for you Greg. What information to you want to see? I hate to post all the info because a lot of it I'm sure you don't need to see.

I have a stretch of road beween MI/WI that I can quickly jump on, kick it down and slow down as I cross the border. We never have MI or WI police in this short stretch so I was able to do 3 quick runs at WOT. Looking at the logs the knock is when I'm in 1st gear as I get the RPM up and I see the knock disapear just before I shift into 2nd. The rest of the run is clean as a whistle no knock and O2 sensors cut out.

So let me know what info you want to see and I will post it.

Thanks
Kyle

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93 3000 GT VR4

So what you're saying is, there is NO knock going WOT correct? On multiple occations too. I don't care about 1st gear.

Shoot me a direct email and I will send you .pdf files of the runs. I don't have anywhere to host the files.

Basically the knock is accelerating in 1st gear just before shifting into 2nd. I thought my problems were occuring between 2nd and 3rd so I didn't have the throttle buried while in 1st. The first fun was as high as 28 counts, second only 2 counts and 3rd only 11 counts.

Kyle

klindstrom (AT) jered (DOT) par (DOT) com

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93 3000 GT VR4

The logs aren't going to tell me what gear you're in. Just answer me this:

You only get knock in 1st when going WOT?

AND

You only get knock durring part throttle acceleration in 2nd & 3rd?

Yes, from looking at the logs I'm only getting knock in 1st gear. It was not at WOT in 1st maybe 50-60 % but it was in 2nd and 3rd. It was late in the 3rd that I finally would see TPS close to 100% would cut out. Best TPS I could get was like 97%. How can I get it closer to 100? Can I slide the bracket on the plenum forward or back just a touch to get it to 100?

Shouldn't you pretty much be able to see my shifts by reading my RPM's and then seeing them drop off for a second as I shift between gears.

Anyway the first run showed the highest knock at 28 and the engine seemed to still be running a bit cool, 183 degrees at the start and 193 at the end. The next runs the engine temps were around 203 degrees and there was a lot less knock. Not sure if that has anything to do with it.


As far as knock between 2nd and 3rd when not at WOT I will look back at my old log and see. I might have been reading it wrong thinking I was between 2nd and 3rd. I might very well have been in 1st before I shifted to 2nd.

Kyle

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93 3000 GT VR4

throw in some race gas, see if it goes away.

if it doesn't you've more than likely got something banging around, tripping the knock sensor...

GTMT.

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Bad decisions make good stories.
Look at it! LOOK AT MY @SS AND TELL ME IT'S PRETTY!

Alright, by what you're saying, you may need new motor mounts and/or driveshaft carrier bearings. If you were actually getting knock, it's wouldn't go away as you get higher in the RPMs (or what Adam said, it would go away with race gas).

To get 99% throttle on the logger, you need to adjust the TPS on the throttle body to say 12-13% at idel (when your foot is off the gas). You just loosen the 2 8mm bolts and rotate it (just a tad) till you see 12-13% on the logger. The motor does not need to be running for this, but you need the ignition to be on.

If you're already reading that at idel, then go ahead and tighten the throttle cable.

Looking at my logs at idle around 750-800 RPM the TPS is at 12.9% on all my logs. Your numbers exactly so that's nice to see.

Now where is the Knock sensor located? I might take a look to see if anything is loose.

Funny part is I found another person in town with a twin turbo. He called me to come over, jack up my car and see how to put his driveshaft back on. He was replacing carrier bearings and had it apart for a long time. He said he need to see where a couple of bearings or mounts that were different in height went in the front or rear. He probably will have it back together this weekend. I will have to get with him to see how hard it was to replace them. The car has 127K so its probably good sense to replace them anyway.

So what type of knock do you want to avoid? Knock that shows up and doesn't go away? Knock only at high RPM's? I know any knock is bad no matter when you see it but just wondering what the worst knock is.

I hope I don't sound too much like a Noob!

Thanks again for your help Greg and Adam

Kyle

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93 3000 GT VR4

Please tell me the guy marked the driveshaft before tearing it appart. If he didn't, he's probably going to be experiencing some wierd "vibrations" while cruising from now on.

There's a VFAQ for doing carrier bearings on a DSM driveshaft. Ours are almost exactly the same. Check out www.vfaq.com

You want to avoid all knock, but it's just experience telling me that the type of knock your sensor is picking up is false.

The knock sensor is located in the center of the motor underneith the lower intake plenium. It's not so common on our cars, but I've seen it a lot on DSMs where the insulation for the wires melts off and make the sensor "overly sensitive". Same thing can happen if you over tighten it when installing a new one too. Good luck removing it with the heads on too b.t.w.