LH module with increased adaptation for DM code 19?

[Stevester 500E]

I am getting a DM code 5 and 19.
I heard there is an eprom chip that can increase adaptation limit.
Does anyone know if this is true and where one can purchase such eprom chip.

Would the latest M119 LH modules have a wider range of adaptation?

 

[gsxr]

Re: LH Module innards

The modified programming with increased adaptation (to ±32%, up from stock of ±25% according to the FSM, or ±16% according to other sources) is ONLY, and I repeat ONLY, for the 4.2L engines.

Someone who shall remain nameless sells these chips for "all" LH M119 including 5.0L which is just plain wrong; the seller does not understand the chip also includes fuel delivery mapping which varies by displacement.

If you are getting DM code 19 your mixture is either too rich or too lean. You cannot verify without a digital scanner that will show the adaptation values from the LH module.

Also, keep in mind this problem only affects USA models with a CEL and DM module. The ROW do not have this and nobody would have a clue if their LH adaptation was near limits. Since the system is OBD-1, CA smog testing cannot tell when the DM was last reset, so if you can keep the CEL off for a few restarts, you can clear it just before going in for the test. However it could be indicating a problem that could be the cause of your smog failure due to high HC.

And, a bad O2 sensor could be causing this as well...