In need of the Memory-Calibration [chip?], re:TSB - where to get it?

[Schrade]

I have the high idle at coast-down, hard hot restart, as described in the TSB that Rob linked me to here.
Corvette Action Center Knowledgebase :: 1990 - 1991: Service Bulletin: Hard Start on Hot Restart / Increased Idle Speed

Where do we get this upgrade module(?)

 

[LT4man]

gmpartsdirect.com does not have either Mem-Cal.

You could check your neighborhood Chevrolet dealership. I am thinking they might not be available anymore.

 

[K & B Special Products]

Memcal

We have all in stock for any C-4.

 

[Hib Halverson]

Before you go spending money on a cal change, check the broadcast code on the cal already in your ECM to make sure the TSB change has not already been performed.

Considering the engine is 22 years old, it's possible the high idle speed and hard starting, are due to problems other than listed in the TSB.

Vacuum leaks and leaking injectors may create the same symptoms.

 

[Schrade]

Before you go spending money on a cal change, check the broadcast code on the cal already in your ECM to make sure the TSB change has not already been performed.

Considering the engine is 22 years old, it's possible the high idle speed and hard starting, are due to problems other than listed in the TSB.

Vacuum leaks and leaking injectors may create the same symptoms.

Although possible, I considered no probability that it HAS been done, because cold start is immediate, and hot start is retarded. Coast down to a stop is high idle, and I think vacuum leak would cause loping idle. Idle quality when at a complete stop, is smooth as glass.

Leaky injectors could EASILY cause this, however, the day I brought it home, I did static FP tests (48 PSI), leakdown (still at 48 @ about 12 minutes), and checked for H DTC's. High voltage to LED instr cluster was indicated (probably a weak ground(s) ).

Do I need some sort of radio receiver to receive the 'broadcast code'? Or is this perhaps just a label on the ECM (or on the module, inside the cover underneath)???

 

[Hib Halverson]

Although possible, I considered no probability that it HAS been done, because cold start is immediate, and hot start is retarded. Coast down to a stop is high idle, and I think vacuum leak would cause loping idle. Idle quality when at a complete stop, is smooth as glass.

Leaky injectors could EASILY cause this, however, the day I brought it home, I did static FP tests (48 PSI), leakdown (still at 48 @ about 12 minutes), and checked for H DTC's. High voltage to LED instr cluster was indicated (probably a weak ground(s) ).

Do I need some sort of radio receiver to receive the 'broadcast code'? Or is this perhaps just a label on the ECM (or on the module, inside the cover underneath)???

Yeah...you need a short-wave, discombobulating inverse frequency receiver along with a GM cal broadcast code decoding module which is only available for the TECH 1.



Just kidding.

The "broadcast code" is a series of alphanumerics stamped on a label that stuck to the inside of the calibrator chip. Un bolt your ECM, flip it over, remove the cover and pop out the cal. You should be able to see the code if you look carefully at the top cover on the calibrator chip. Compare that code to the one called for in the TSB

 

[Schrade]

Thank you Sir...

(I didn't know really, if you needed a special ALDL connector, like tool J-xxxx, or other reader-type device, to determine hardware update :confused )