Sudden Loss Of Power (1 Viewer)

[Russ in California]

Wife was driving the LC to town just now and let off gas pedal and decelerated at the 'safety corridor" then noticed no throttle response no steering . looked down at gauges and saw the previously always on checkenginelight not on and Tach at zero.
She didn't not see all the other dash indicators lit.
Pulled over and apparently was able to restart and drive here to my work (3 miles away) with no problem.
Cursory look under the hood yielded no clues and it was idling fine with previously mentioned checkenginelite on .
Any ideas with out further diagnosis at this time?
Quaking in my boots,

 

[gnob]

CEL off says all power or just ecu was not powered.
First guess is battery terminals or efi relay. Maybe ignition switch.

 

[Russ in California]

Update, she didn't pull over to restart, it restarted on it own on the highway as it was rolling along.

 

[gnob]

How do you bump start an automatic?

 

[retrofive]

My guess is short in the main harness, there is 2 spots that are prone that will do that if bumped and shorted; 1) engine bay main harness by the EGR(phh) pipe is common for heat/meting 2) behind the glove box where that harness in the cab run, the metal sub structure has been known to chafe that harness and cause similar issues. (All 80 series specific stuff)

WAG

 

[Russ in California]

How do you bump start an automatic?

no power and 0 rpms then it came back to life is what I'm understanding.

 

[Russ in California]

No issues on the 13 mile drive home but the EFI relay was pretty hot.

 

[Russ in California]

13 mile drive into work and the relay was warm at best.
Fixed?
No issues driving to work this trip.
Onward cautiously,

 

[Russ in California]

guys in motor pool here at work tested the offending relay. toast!
hope that was all the offending items.
seems to be running fine.
onward,

 

[Russ in California]

Big uhoh!
LC died on the wife on a turn last night. She was going slow and barley able to wrangle it to the curb.
Lucky she wasn't on the highway again.
Towed home and off the the shop on monday.
Don't want anyone to die.

 

[Russ in California]

Bad EFI relay I replaced had melted the EFI fuse.
All fixxy now.
Puttin a spare relay in the glove box for good measures.
I can get pretty far out in the bush in Lake county.
onward,

 

[Kief]

Yay! Good Job