Maf to s/d conversion

**Gator** · 1 Week Ago

Hey All, 7730 installed w/v6 mod memcal, had to change injector flow rate to 24 to get it to clear flood and run, the biggest issue is I a getting CTS & MAT Low errors they are connected to E16 & F 16 grounded to B5& B6.
Tuner Pro RT latest and & $8D. Both worked connected to earlier ecm . is it an addressing issue or what ???
both edited to show F instead of Celsius reading 32 and not changing, start up engine temp reads 265 stone cold????????????????????

**dave w** · 1 Week Ago

The schematics I have for the 7730 Sensors:

F16 - MAT Signal
B5 - MAT Ground (Low Reference)

E16 - CTS Signal
B6 - CTS Ground (Low Reference)

Maybe try the attached $8D .adx file, "WITHOUT" the 10K jumper on the ALDL Cable.

7730 Sensors.jpg

**Gator** · 1 Week Ago

Thanks, Dave not using 10k jumper and wired as shown, belive I have a bad ecm ordered a replacement , reason being have issues with both circuts what are the chances of that??
Seems like this car just don't want to run, have had one issue after another

**Gator** · 1 Week Ago

Thnks All for the input,
Now that i have earlier issues resolved, I had to move injector flow rate to 24 from 19 ( i had 22lb injectors but was having issues with them, so for now 19 it is) i am running an 84 corvette. moved from crossfire tbi to mpi SD.
the question is:::: Should I continue to adjust flow rate to resolve the rich condition or adjust VE??? I Know with TBI adjust BPW until close then VE.

**dave w** · 1 Week Ago

I’m thinking injector flow to correct rich is to increase the injector flow rate.

For example the WBO2 is showing AFR’s averaging 12.4 with an injector flow rate of 22 lb/hr. After increasing the injector flow rate to 24 lb/hr the AFR’s are averaging 13.8.

Increasing the injector flow rate makes the computer “think” less fuel / smaller injector pulse width is needed.

I adjust the VE Table when the data log shows some AFR’s are Lean and some AFR’s are Rich.

Adjusting injector flow is course tuning and adjusting VE Table is fine tuning.

Most if not all 305 TPI engines had 19 lb injectors as original equipment.

**Gator** · 1 Week Ago

Thanks Dave was very helpful, now on to the next question now the car is running idle is ok when hot, but really rich when cold, is there something like a choke that can be adjusted separately from flow rate & or VE??