Drawmain

BLM stands for Block Learning Mode, it is the part of the programming that allows the computer to "learn" what the engine wants as far as fuel. Optimum BLM value is 128. The heated O2 helps, but the computer won't go into closed loop until the temp sensor in the front of the intake manifold reaches (I think) 160 degrees. The more I think about it the more I'm thinking valves, though. Why do we stay up so late anyway? lol

alconk

Lol that's funny, my excuse is I work 2nd shift and am a night owl. Great info you have given me thanks. Another thing is ( and have had this since owned) is when I come to a stop the RPMs are around a 1000 or so and I have to sit there for maybe 30 sec. or so for it to drop to idle RPM. Is that normal? In other words the idle is very slow reacting I think anyway. I will check the valves sometime today.

Drawmain

Make sure your throttle cable isn't binding, and your cruise cable, too. I really think balancing the tb's will solve some issues with the idle hunting and the rpms not coming down. My excuse for the late nights is being off for the summer and doing college homework for summer classes

alconk

Well I received a couple things in the mail and I'm been searching the net for a laptop. So many decisions. I need just something basic right?

Drawmain

yeah It doesn't take much. Just make sure it has the connector you need for your cable.

alconk

Hey Marc are you using Windows 8.1 for your data logging? I just bought a used laptop but not sure if it will run the logger?? Haven't plugged it in yet as it's getting re-configured.

Drawmain

I'm using Win7. 8.1 should work, but you will need to tell it to run the program as Win XP. Just right click on the program's icon and select "Properties" Then go to the tab labeled "Compatibility". Check the box labeled "Run this program in compatibility mode for:" then set the drop down under that to "Windows XP (Service Pack 2)". Now this applies to WinALDL, if you have a different program there may be a different way.

alconk

Hmmm I didn't think I'd catch you up still.. Are you still using your stock computer then cause from what I'm reading it says to use the 1227747 ECM?? I bought the ALDL USB cable and came with the disk so I'm hoping it will just take off. I tried installing it in my Mac and didn't do anything.

Drawmain

Doesn't work on a Mac as far as I know. I'm still using my stock computer, but I'm just datalogging. In order to program you need the EBL Flash computer, just google EBL Flash and it will take you to the site. WinALDL is a free download if it isn't on your disk.

alconk

Well I was finally able to start logging data (confusing) and under "error codes" #42 EST came up (electronic spark timing)??? Did this mean it's bad, I take it it is??

rmm82

According to the 82 Shop Manual: "Code 42 indicates that the ECM is not receiving the proper bypass signal voltage through the HEI bypass feedback circuit". Again, I'm not a mechanic by trade, but I'd guess you have an open circuit or short to ground somewhere. There is a big flow chart on page 6E-46 that covers the diagnostic procedure.

Drawmain

When you disconnect the EST to set timing it sets this code. The computer stores the code even after you reconnect the wire.

alconk

Ok that makes sense cause last time I set the timing I did not disconnect the battery to clear any codes that would have come up.

alconk

Thank you for looking this up but I'm hoping it's what Drawmain said about disconnecting the brown wire. If not I'll look into what you have described.

rmm82

If you didn't clear it, I think Drawmain is right. But you can clear the code via WinALDL and see if it comes back.

alconk

Ok I didn't see that option but I'm very green behind the ears with that program. Just started using it yesterday for the first time.

cv67

Lots of guys with the 84 cfis with cams will up the fuel pressure some takes care of the lean spot no tuning or computer stuff necessary
not sure if the computers are any different

Page Tom400cfi in the c4 tech section hes expert with those things.

alconk

Ok thanks, I have already replaced the pump with an 85 and am running 14 psi of pressure. I'll check with Tom400cfi.

Wrecked82

I chased a code 42 for at least two years. Replaced ignition module and both harnesses on module end. Also replaced the computer. Finally disconnected the est wire, which I had done many times, but this time cleaned the connections and re-connected and code went away and has stayed away. Corroded connections. ;(

alconk

When I disconnected the connector I looked at the terminals and they looked fine. I will however disconnect them again and clean them up good and add some di-electric grease. Did you have a CEL for that code? My light is not on?? Did it make a difference on how the car ran once you were able to clear the code?