I had someone burn me a stock PROM because I dont trust that the previous owner left the prom alone. Turns out I was right, it has a memcal in there from someone I've never heard of on the boards. Regardless, I'm using the Moates adapter that uses the new PROM for half of the prongs and the old memcal for the other half. Why is the adapter designed this way and why do I have to reuse the old memcal in this manner when the whole reason i got a new PROM and adapter is because I dont trust the one that's in there? I'm uncomfortable still relying on it. What part of it does the car need and is it a "general" thing that's the same as the stock memcal or is it possible that the part I still have to use was reprogrammed and could still screw up my bid to have stock programming again? Thanks.

 

there are pictures all over the moates.net website dealing with instillation and oretation. sometime in the last week somebody else had a similar question. do a search of this forum.

 

I dont have any problems with installation, that went fine. I'm just asking why it has to reuse half of the old memcal and if it could possibly defeat my purpose of trying to get the stock programming.

 

thats part of the rfd ( redudant fueling device ) being as GM designed a modular ECM to fit alot of different applications the RFD chips on that memcal vary from make to make or more correctly from engine to engine. Bascially it the CPU on the ECM takes a dump the RFD kicks in and runs the car. the ignition systems are designed around this pricipal to. if you unplug the EST line from a module it goes into a fixed rate of advance mode.


nope wont defeat using the stock programming as long as everything is put togerther properly.

 

So when the car goes into limp home mode, is this when it runs of the RFD?

 

Isn't the knock filter part of the "other half" of the MEMCAL?

 

there are couple of stages of limp home. a sensor failure will put some sections of code to work which are 2d tables that are based on other sneosr input. the RFD is for s serious fairlure of either the CPU or the EPROM, yes the knock filter is located over top of the rfd on a good chunk of the mecals.

 

The moates adapter isolates the eprom on the memcal. The other half of the memcal has the RFD as memtioned and the knock filter (ESC) which is needed. The ECM will only see the eprom that is on the adapter. No connections to the one on the memcal.

BW

 

This doesnt sound good for me - I get an intermittent code 43 for no reason, nothing goes wrong, and it sets into limp home mode. when i restart the car, it goes away. Could that half of my memcal that has the knock filter be screwing up?

 

seems unlikely. might not be passing the knock test.