I have a 1988 GMC Sierra 1500 truck with a stock 1227747 ECM that now won’t start.
Here’s the problem, I was trying to solve a progressively worse idle/ stall situation:
- Tried to install “tuner pro” software from a purchased disc, anti-virus would not allow the full install
- New ALDL cable plugged in from truck to laptop
- Started the truck, ran for 15 seconds, then died.
- Downloaded “winALDL” from the internet, “freescan 207”
- Now I can see 4 rows only of data while cranking......no start!
- Tried the paperclip trick.....no codes
- Tried resetting the ECM by disconnecting the battery.
- Confirmed no spark via timing light, now fuel via visual
After a couple of days off from the above, now it fires for 3 seconds and dies.
Hopefully someone here can help get my truck back up and running. Did I fry my ECM?? What should I be looking at to troubleshoot?
Thanks in advance!
88 GMC
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