intermittent '747 problem

[Marc Piccioni]

Thanks
-----Original Message-----
From: rr <RRauscher at nni.com>
To: gmecm at diy-efi.org <gmecm at diy-efi.org>
Date: Monday, February 19, 2001 06:53 AM
Subject: Re: intermittent '747 problem


>
>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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>
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