ECM fault?

[Shannen Durphey]

Akselrud, Boris wrote:

> >
> >>Unfortunately no one answered my first post regarding what I think is ECM
> >>related problem in 5.7 TBI in my 1993 Cadillac Fleetwood.
> >>The problem is erratic or I would say unstable idle. Looks like ECM is
> >>leaning the mixture (don't know for sure) causing idle to go below
> >>comfortable level for 2..3 seconds followed by 2..3 seconds of smooth
> >>operation
> >>
> >

If your scan id is 353 or 357, or your Broadcast code is ATNL or ATNR,
you can go to the dealership and get an updated prom.  Caddy found
some cars had idle problems, the bulletin number is T-90-2A.

Shannen