Attached is an Excel Spreadsheet that has a COMPLETE* list of all BIN values for the following five BINs:

AKDX
AKSM
AZFT (a 7.4L BIN)
"TUNE15A" - the BIN I am running currently
"Howell 2nd" -...

Hi! Thanks for that response - it's full of good little nuggets of information.

Some things I am wondering about.

With the vacuum gauge on the ported port, the vacuum does seem to increase...

Hi 'lionelhutz':

Thanks for the reply!

In the BIN I am using there is a table called "EGR - VE Comp Table":

0 6 13 20 25 31 38 44 50 56 63 ...

Hi 'ony':

Well, it's there as of about an hour ago. It is now on one of the manifold vacuum ports that I had to drill in this particular throttle body. I am assuming it's from a later model 4.3....

SMALL amount of progress (this is like being a detective).

The FSM says that the vacuum going to the EGR valve after the solenoid should be 2" to 10". I tested this and discovered that at higher...

OK - Here's a brief update on the above:

I changed the fuel table based on the very low (RICH) BLMs.

I also changed some of the EGR settings back:

- MAP Thresh EGR On -- back to the...

Hi All:

(Been gone awhile, but I'm back now)


I have an old Howell system (10-11 years or so) on my Jeep Wrangler. It's a fuel-only system that I am trying to update. One of the things I did...

Thanks to both of you! This stuff is slowly becoming clearer to me. Both of those explanations improve my understanding of how this works. Too bad my ECM doesn't include the cell number. However,...

Now that makes sense. In all my reading I have never heard of accessing the 'cell numbers' - I was just using the BLMs from the history tables - and the average ones for the whole run at that. ...

1project2many:

OK - I get it. I've been using the 'BLM cells' all along to change my VE tables. I make a chip, take a drive, record a bunch of data, and use the table that has the BLM history...

There are lots of theories on the number of universes that exist. The number ranges from one to infinity - most physicists lean toward the infinite number, which, by the way, suggests that there...

I've tried to figure out just what type of signal the sensors produce. It seems that there are two kinds of 2-wire sensors and maybe one or two kinds of 3-wire sensors. The 3-wire ones don't matter...

Hi 'lionelhutz' - thanks for the reply!

The Rostra thing I am using is a two wire magnetic sensor that comes with four magnets that presumably go on the driveshaft. It is part number 250-4165 -...

Update on VSS:

I figured out part of why I can't get my VSS to work: I have a wire labeled "Vehicle Speed Sensor" but it doesn't seem to go anywhere. There is one end that I guess is supposed to...

Thanks to all who are replying to my posts!

I have piddled around a LOT with this stuff. For the most part I have played with my VE tables (I combined most of the stuff into VE1, and left a value...

OK. I've made exactly three new "chips" for mine so far. It has helped, but there's still more to do.

I do have tables, but like you said the values are all '0'. I would very much like to let...

Hi again:

(This seems to be turning into a log of my progress in learning to tune my Jeep)


After some time and lots of effort and studying, I have been successful at improving my Jeep...

Hi Again:

I have been doing some tuning by changing my VE1 table based on BLM history from datalogging with TunerPro RT. The changes have made more of a difference than I expected, so this has...

Another comment:

Six_Shooter recommended enabling electronic spark control on my Jeep engine. I like this idea and have been studying about it some. I get how to modify the distributor, and I...

OK - some progress has been made.

I put the real 4.3 throttle body on yesterday in place of the small one, and it actually improved my BLMs noticeably. While a few cells at low Map and low RPM...

Thanks Six_Shooter!

I like what you said - those are ideas I can understand. Weirdly I found the chip and buffer addresses right after I made that post, despite searching for them for days -...

Hi All - First real post here - asking for suggestions, advice, guidance, support, help, etc. for tuning up my Jeep. I've included as much information as I can think of.

Background in a nutshell:...

Here's my first post so I can start using this forum. Presently I am working on a 1990 Jeep Wrangler - it has a 4.2L straight six with three speed automatic. 1990 was the last year for a carburetor...