Connector #5(grey) at the ignition stage had backed out. I thought that was the problem. However after repairing the wire, the engine did another shut down(couple days later).
Each time, after shutting down it restarted a moment later. Leaving me paranoid.
Any ideas? Car is running now, but...

Thanks

L.

You should repost this to show up in the 200-series section.
Use the Model/Year boxes when creating the post to do that.
Because many folks go straight to the 200 section and won't find your post here unless you tag it "200".

My guesses?

Fuse in white fuse holder on driver's side fender wall, rearward from the coil. Fuse rarely blows but gets dirty + corroded. Fuse holder can get nasty inside also. If you pull the fuse holder, pull the battery ground wire first. Otherwise, BIG POP for certain.

Crank position sensor. Look in the 700-900 FAQ that's available from the dropdown list at top right corner of these pages. CPS was first used in the '89 240's. If original it's nearly guaranteed to be due for replacement. Often ignored due to nearly invisible.

Fuel pump relay. On kick panel below the glove box. Often develops solder joint cracks.

You can also look up the computer fault codes in the FAQ.
--
Sven: '89 245 NA, 951 ECU, expanded air dam to 7" from ground, forward belly pan reaches oem belly pan, open-front airbox, E-fan, 205/65-15's, IPD sways, E-Codes, amber front corner reflectors, quad horns, tach, small clock. Wifemobile '89 245 NA stock.

thanks
You learn something everyday.
I looked at he solder joints in the fuel pump relay. One of the joints was kind of shaky. I put in a new one.

Thanks again, Ill repost in the 200 venue.

L.