My 94 coupe is still running rich, when i logged it a couple weeks ago with data master the Lterm was rich most of the time, hanging around 120-124 counts, where as the Sterm was up and down. Lterm seems to go up around 128-133 when PE mode comes on. (which casts doubt on my thinking the injectors are bigger than stock) The car has a few mods, however they were done by the previous owner so i only know a few of them for certain.

Known: Crane Cams 1.6:1 RRs, ported intake and heads, equal length 4>2>1 LT headers, high flow cats, true dual 2.5 inch exhaust with straight through mufflers and smooth X-pipe, EGR deleted, AIR disconected, and K&N filter with cut lid.

Suspected: Bigger than stock cam shaft.

I also suspect that the fuel injectors may infact be larger than the factory 24Lbs/hr injectors(the ECM tune is set to 24.87lbs/hr which im told is factory setting), i pulled them out today and checked for leaking and they all seem fine. The ECM tune is completly standard apart from the few things ive changed in the past few weeks, mainly to do with auto trans shift points, and disabling of the EGR. (so it cant throw its codes)

The car has run rich ever since i bought it, with no real change when ive replaced things such as O2 sensors, put in an LT4 knock module to cure the false knock/spark retard issue, new plugs/leads, the distributor was replaced just after i bought the car (due to being half full of water)


I have Tuner cat and Datamaster. What should i look at changing in Tuner cat to try correcting this problem? I can send files if requested. Thanks very much in advance

 

120-124 is not really that rich. But, if you want to lean it out a bit try running one of your datalogs through VeMaster, then reprogram your car. This should get it a bit leaner. VeMaster's default BLM target is 124, but you can raise that if needed. Just remember you want your BLMs to stay a bit below 128, so when you go into PE mode they will lock-in at 128.


http://home.comcast.net/~jgeorger/

 

Thanks mate, ill give that a go. I just had a read of some info about that program, from what i understand it is saying that since my rocker ratio is up from 1.5 to 1.6 and the possibility of a larger than stock cam, the lower rpm will suffer(which is the case) It hesitates on acceleration from low rpm, yet it seems to respond quite well at higher rpm.

So to be sure i understand what i need to do here to use this program, do i need to simply drive around about normal and log the car, then run it through this program? How long should i make the log? Is there any particular way i should drive the car to get best results from this program?

Thanks again STL

 

Run your datalog for about 15-20 minutes, vary the rpm and load from idle to 3000 rpms. Enter the data log and your current .bin file into VeMaster, and in about a second the changes will be made. Then reflash your PCM with the .bin file and your blms should look a little better. Sometimes you may have to do this process a few times. I've had very good sucess using this program on several 94's.


-Mike

 

Quick question! Will VEMaster work on a 95?
Thanks,Ray

 

I've used it on two 95's.

 

Ok, ive done 2 logs and run the VE master twice, some changes were made by the program, some seem to have improved it, however i think i have a bit to go yet. For the most it seems to have helped, but the low rpm rich stutter is still there (however it seems different, hard to say if its better or worse).... Where should i go from here? Should i run a few more log/modify cycles?

 

I was just reading on Joe's web site that VEMaster only works on speed density cars. Is this true? Mine is MAF.

 

I've used VeMaster on 4 94's and 2 95's with MAF's, and it worked great each time.

 

Great, thanks for the reply.

 

Yeah after further use it brought mine up to a much better standard, throttle response is far better now, and so far no more black rear bumper.