yea.. i've noticed my timing maps and the datalog records dont always match up.. I was wondering about that.. I just figured it was the ECM tring to advance the timing until knock and then back it off for some type of performance gain.. I donno.. would you care to take a peek at my .bin and most recent datalog? maybe you catch something i'm missing...

 

I can try and open your files. All my stuff is OBD II related so I use LT1 Edit, AutoTap, etc.

I *think* there's a shareware program out there to convert bin files to *.LT1 files, so I should be able to look at that.

If you can export your log file to a .csv file, I can open it in Excel.

My e-mail is JVMason@Juno.com

 

First off - Merry Christmas everyone!

ok.. on to buisness..
my power inverter for the laptop causes bad data records evenry now and then.. if you dont use datamaster you wont know which ones are bad (i.e. if i export the files).. i'll try and edit the bad records out and send you the resultant data..


I pulled the plugs out today and was surprised at what I saw.. The plug gaps ranged from .053-.060!!! The recommend gap is .050... I can't believe the gaps opened up so much in 10k miles.. all the pucks were present.. I dont know if that could be a contributing factor.. we'll see in the morning.. since all the stores are closed today i'm in a holding pattern.. first thing i'm gonna run out and pick up some of the NGK plugs screw those in (which the correct gaps set) and see if that works.. I think i'm gonna start with the LT4 heat range plug since the compression ratio is the same as my stroker..

I'll post more info in the afternoon

 

welps.. I re-gapped the plugs to .050" and installed a new coil... that didnt do it.. I'm thinking the chances are pretty high the brand new dealer purchased opti-spark is the culprit!! that would absolutly suck! Anyways, this is out of my hands now.. i'm taking it to the professionals this afternoon.... thanks for eveyones help.. i'll post the diagnosis and the assoicated repair bill when I get it back..

 

Day One: They had the car about 6 hours today.. no word yet..

 

Oh No, the waiting game

 

Its been about 18 hours now.. but didn't have a chance to work on it today.. The corvette guy called in sick..

Looks like I'll find out tomorrow.. These guys are tops and have done a great job with problems my car has gotten me into in the past.. I just am eager with anticipation to find out what the heck it was and how I missed it/couldnt find it..

Let the waiting begin.. again..

 

And the word is

 

Where is the rest of that story???
I have the same problem with my wife's Z28 and I'm waiting for the outcome of this one...

Al
95 ZR1 #108

 

I must say I am very pleased with the dealer even though they couldn't pin point the problem.. the car spent a good part of the day on the rack and they held to the 79.00 diag. fee.. WOW!

Anyhow, the ran a bunch of tests and the tech called me directly a few times during the day to ask some detailed questions about the storker motor, engine specs, programming etc..etc.. these guys were tops! however, the problem couldnt be tracked down.. but by process of elimination the tech suggested it most likely is a mis-aligned opti-spark.. they said with the splined dowel optis (early opti) it is possible to install it off a tooth or so and that would cause a problem like this.. the tech tested just about everything else and came up blank.. They said they would be willing to verify the opti is installed correctly but would have to charge 4 hours labor... and suggested that since I installed it initially that I might be interested in double checking it.. (and would save some $$ also). anyhow, after a detailed discussion of the testing procedures I had already run and those the tech ran I decided the best course of action was for me to check it.. the tech said after i verified it was on correctly..if the problem persisted to bring it back and they would pick up from there....

so I went home and removed the water pump and opti to verify the installation.. when I got the water pump and hub off I noticed the Opti-Spark unit was LOOSE!!! i.e. the bolts that hold it to the engine appearently were only hand tightened.. appeartly in my rush to reassemble I didnt torque them down.. the loosened way up and the opti would vibrate to kingdom come udner high RPM.. anyways, I removed it, cl;eaned it re-assembled it and will test it in the morning..(I need a new o-ring for the waterpump shaft before final assembly). But I am almost..Almost.. postitive this is it..

needless to say I feel a tad bit silly for overlooking something so basic... I'll psot results when I can verify everything is operating within specifications..