Introduction

[Bruce Plecan]

Yep, ARJT is a 747 ecm calibration.
Try opening it up and see if there is any trash in it.
Plug and unplug it a few times, might be a tarnished connector.
Otherwise, I'd return it
Bruce


>     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
>
>
> --------------------------------------------------------------------------
--
> To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org