Newbie question , re; mem-cal compatability; TBI to MPFI ??

[1project2many]

I didn't notice that the TBI calibration was confirmed to be the same mask or from the same ecm. The 93-95 period involved the changeover of S trucks and then Blazers and there were at least four different computers in play. In order to use the TBI cal in the CPI the planets have to align such that

The ecm numbers match:
The TBI cal is the same mask:
The TBI cal is programmed into the CPI memcal

In addition to the CPI bit being set, there's also an intake tuning valve used in the L35 intake manifold which selects between longer runners to enhance torque or shorter runners for higher rpm operation. If this valve is not operational it's very noticeable. And the L35 uses a digital EGR valve vs the vacuum operated valve found on the TBI engines. If the vehicle is not emissions tested then disabling the EGR might be an option. Typically the L35 engines in the new body style trucks are configured as OBD 1.5 so they will use dual O2 sensors while the TBI configuration typically uses only one. Again, probably not an issue but still a consideration. And the purge system on the L35 truck uses a digitally controlled valve while the purge on the TBI truck typically uses ported vacuum for control. And of course there are small differences in timing and VE related to the tuned intake and larger L35 cam so those would have to be worked out too. Nothing insurmountable, but probably a fair amount of effort for a newbie.

I put together a list of possible manual trans L35 cals. A person could look at the cals in an editor to see if it's configured for manual or 700R4 use instead of electonic trans.

BUZX
BUZR
BPLB
BPNJ
BNRT
BMCF
BHRJ
BDBX
BUZK
BUZM
BBNT
BMUS
BMUR
BUZT

I've found another manual specific cal but I don't recognize the ecm number. CBJX is used with Astro van manuals and ecm number 16156647. It's probably not compatible but worth a look around on the web. The other cals above are not specifically manual cals and they are not listed with electronic trans so they could be for a 700R4.

[EagleMark]

What's even stranger about the CBJX bin is it is for a 1992 model year with a release data of 05/19/97 ?

[1project2many]

Probably an update. There aren't many cals having four letters and beginning with "C" so it has to have a late production date. Cross checking the database there are 6 calibrations with a 1997 release date for that ecm and all are for 1992 model vans.

Now the next step is to hunt down the cals from the list above and see if any are truly manual trans cals.

[romac55]

Probably an update. There aren't many cals having four letters and beginning with "C" so it has to have a late production date. Cross checking the database there are 6 calibrations with a 1997 release date for that ecm and all are for 1992 model vans.

Now the next step is to hunt down the cals from the list above and see if any are truly manual trans cals.

You guys have given me lots to think about , and I'll have to read what's on this BUZY chip that's supposed to be from a manual trans-V6-L35-vinW-CPI motor out of a 94 Blazer with a 16197427 ECM . I'll keep this list of suggestions and go from there . Many thank you's . Be safe...Bob

[1project2many]

BUZY is listed as an Astro van calibration but the GM data doesn't say 4L60E so it could be a manual trans cal.

If you feel like sharing, or need a hand evaluating the calibration for trans type, post it up. Someone here will take a look and sort it out.

[EagleMark]

BUZY I like that BCC!

Looks like a 4.3 CPI Manual Fed emmissions, so should be a very good start.