AVID

I've been messing with datamaster to help shed some insight into why my 94 has been running so rough. I've got no codes, so I figured datamaster would be a useful tool to take a peak at what the engine is actually doing.

I come with some seeming anomalies:

1. I lose sync with the PCM every 5 or so seconds. It just can't keep a constant, stable connection.

2. When first starting the car it shows my knock counts at 1500. That's simply not right.

I'll post a few screen caps of my different data runs to see the weirdness I'm experiencing.

MrWillys

Where did you get the cable from? Has it worked in the past properly?

WW7

It's been awhile since I bought Datamaster, but I believe I had to shut off the screensavers and battery saver modes that put the computer on standby or sleep mode, there was also something called "CCM Handshake" that you had to disable or it wouldn't stay connected. .You may want to call TTS and see if they can tell you what you have to disable for Datamaster to stay connected and work properly....WW

http://www.ttspowersystems.com/DataM...downloads.html

AVID

I got it from aldlcable.com

This was my first run with it, I'll need to work out the things that I'm doing wrong with datamaster, and possibly try some other programs too.

MrWillys

Try a different com port and see if that makes a difference.

AVID

I'll give that a try the next time I take her for a spin. I would be working on Father's day and the last day of nice weather we're gonna have for a stretch.

TA

This is exactly what I had to do when I datalogged with datamaster. No matter what I did the connection would fizle out quickly. Finally I disabled the "CCM Handshake" and it worked perfectly.

captainkawasaki

I use Moates hardware and TunerPro on my '90. You definitely have to get the CCM to shut the *&^# up or you get all kinds of crazy garbage in the datalog. Not sure what the options are in Datamaster but I'm sure it can be done.

TA

One of these days I'm gonna pick your brain and learn how to tune for real (instead of depending on PCMforless).

AVID

Thanks guys, hoping to get out there and give it another try soon this week.

Also,

on my first run once I started recording the data stream the Service ASR Light came on my DIC. Is that normal, or is it a symptom of the issues that I was experiencing?

AVID

bumping this thread up with some pictures of my datarun, screen capture to follow in a few minutes. I have pictures of my histogram. I know there's something wrong here I just don't know where to look.

AVID

Here is the video of my Datarun.

FrankieD

Will it possible to email me your datalog file so I can analyze it further I sent you a PM with my info.

smooth1990

I am having the same issue with the datamaster cutting out every 5 seconds or so. I will call TTS tomorrow!

AVID

Just sent you a reply!

FrankieD

Ok from what I can tell you are getting intermittent "Data Err" which means you are possibly losing communication while datalogging. Please make sure that you have "Disabled CCM Handshake" before datalogging. This is found when you start to record under Options, Advanced then choose "Disable CCM Handshake". Then try capturing a new Datalog and resend me the new file.

AVID

I'm gonna try to go out for another spin today (weather permitting ). I've got a few things to try along with the CCM handshake disable to try to get the communication line stable. Thanks for the help and suggestions so far everyone.

AVID

I've been at it again this afternoon. Took it for another spin and datamaster just doesn't agree with my car. I've disabled the ccm handshake and made sure everything was connected before I opened the program. I don't know what else the problem could be.

It's making it harder yet to figure out why the car runs so rough. Each time I drive it, it gets to be more un drivable. The car shakes when it stumbles and the exhaust pops when it stumbles. I don't have a clue.

FrankieD

take a look at this posting. It suggests to try a program called "Scan9495" perhaps you can have luck with it:

http://forums.corvetteforum.com/c4-s...r-to-work.html

AVID

Every time I do test com, it is successful but it doesn't tell me PCM detected it says CCM detected. Is that the root of my problem? I have no idea what would be causing that.