Introduction

[Shannen Durphey]

Have you looked through Ludis site?  I thought there was a picture of
the 7747 internals there.  Could you open yours up and compare with
the picture?
Shannen

Brent wrote:
> 
>     Hi, my name is Brent Huber.  This is my first post to the list.  I have
> be lurking here for several months and am overwhelmed by the amount of
> information that passes here.  My main reason for joining GM_ECM is because
> 3rdgen f-body's are one of my hobbies.
> 
>       As part of my first tuning project I purchased a used 7747.  I tried
> to test the used ecm in my  '91 Chevy C2500, 350/4L60.  I moved my trucks
> calpak and prom (ARJT7489) to the used ecm.  The engine refuses to start.
> Scan tool reads fine,  tps, coolant temp, no codes, etc.  Put original ecm
> back in and it starts right off.
>       My service# label is torn off the truck ecm,  all I can read is
> 122......., so it is possible that the truck has a 1228747.   However,
> Ludis's site says the ARJT goes with the 7747.
> Did I buy a bad ECM or does my truck really have 8747?
> 
> Regards,
> Brent
> 
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