I just picked up an '88 L4 standard trans coupe 3 mths ago, and as I was driving down the road the car begins flashing SES light crazy before it stalls out. I try to restart it and no go. After grounding out terminals into test mode, it flashes codes 14-34-35-55. I replace all the coolant sensors and map and vac line, & it runs and I drive home.
On the way it stalls again & flashes same codes! Funny thing was..
I DID NOT HAVE PINS GROUNDED!!
I turned off key and sat for a minute, turned key and SES acts normal, car starts up and start home.
Stalls two more times, I flick key off for 15 secs while in gear, back on and runs fine each time.
Any ideas? I've cleaned grounds and checked ECM connectors and reseated them.
Who has run into the ECM going into diagnostic mode by itself?
Thanks, and sorry for long post. Tried to provide as much info I could.
[This message has been edited by Fishogs 84 (edited 06-20-2014).]