intermittent '747 problem

[rr]

I'll second this. From what I have seen a rapid ses light is due
to a cksum error. Try rapping on the ecm while the engine is
running (at a stand-still please). Also check both the eprom &
calpak seating, one may be loose.

BobR.

Mika.Helander at softbit.fi wrote:

> I saw that in my VAN when EPROM "dropped" during driving... Later that
> evening I figured out that one of the EPROM copper traces in '7747 daugher
> board had manufacturing problem in one corner, when outer temp was about
> -25degC trace got separated at 45deg corner...
>
> I can dig out more spesific info if You need it...
>
> -Mika
>
> > Has anyone ever seen a '747 flash the check engine light
> > really fast < 0.5
> > sec intermitently. This seem to occur when aduible knock
> > occurs but can
> > occur without any other symptoms. Occasionally a slight hesitation
> > occurs.........???????
> >
> > This is a 350 TBI swap into a 83 malibu, the swap itself is
> > over a year old
> > and this just started now.....??? Before this the only time
> > the SES light
> > would come on is on the highway after ~40 mins of constant
> > state driving.
> >
> > I have not check anything yet as  -25F weather makes for cold
> > fingers......
> >
> > Otherwise the engine seems to run fine, start good, good fuel
> > economy, plugs
> > were pulled yesterday and are a little bit on the lean side.
> >
> > /Marc
> ----------------------------------------------------------------------------

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