1226870/1227165 conversion

[rr]

My guess is that the engine is in true limp mode. Is the checksum
correct on the new vette chip?

BobR.

Jeff Kopp wrote:

> Need some help with a strange problem.  I recently converted from a 1226870
> ECM to a 1227165 to obtain the faster baud rate in order to help with my
> tuning education (1226870 just way too slow).  I was fighting a no start
> problem with the conversion when I realized that the '86 Vette chip
> (BUB1726) was a VATS chip so I tried a '87 F-body chip (ACXZ1122) and it
> fired right up.  I compared the chips in Tunercat and deducted that I should
> start with disabling the VATS option on the Vette chip and try it again.
> Car starts with the Vette chip now but it does something very strange.  The
> CEL flashes at a steady rate and each time it comes on the car stalls for an
> instant - kinda sits there and surges evenly.  I'm new to this and have
> learned a lot by sitting back and soaking it in - you all are geniuses.  Any
> input on this one?
>
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