[Gmecm] Vortec swap info needed

[DV Fagan]

Beau,
Just running the ecm without a working error code
light puts it in a limp home mode.  Both the 4l60e and
the 4l80e trannys report their gear selection to the
ecm and the th400 can't do that.  That is why the ecm
must be flashed to manual trans.  The th400 needs to
generate a vss input to the ecm and the final gear
ratio needs to be stored in the ecm.
Dennis

--- Ne14RoxCJ <ne14roxcj at comcast.net> wrote:

> I'm sure you're right. The data should tell a lot.
> What would the difference
> be if I got the ECM re-flashed to a manual? I know
> the ECM doesn't support
> the TH400, but what support does the TH400 need?
> Would the engine run fine
> just not having a trans hooked to it, or does it
> expect to see some input
> from the trans? If so, what does it need? Would
> changing the program to a
> manual cal change the spark tables and other
> parameters? It's not really a
> manual and (from what I've seen in the older stuff)
> the spark and fuel
> tables are different for a manual. But, if we're
> getting it re-flashed
> anyway, I'll see about getting that trans control
> removed. The install of
> the ECM and wiring is embarrassing to look at. The
> guy spent well over $30k
> in the last year building this buggy and it looks
> like he is really skimping
> in this area. I just want to make it run like a
> chevy truck should. If we
> can do it inexpensively, that would be great. The
> engine uses a MAF and no,
> the engine light is not on. There isn't one
> installed. Its going to be a bit
> of a project to make this thing right. Thanks for
> the replies.
> 
> Beau



		
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