Hi,

That’s good to do to rule out erratic idle or stalling complaints.

When you say you had a lean running condition related to the fuel injection that is a good place to start by checking for the proper resistance at the ECU.
There is a certain pin to get that reading on and it will check the wiring to and from there while you are at it.
The engine wiring harness on this year model goes bad with insulation rot and many of the owners have to be rebuilt or replaced to fix a few of the problems it creates. My 1984 had been changed prior to me purchasing it. Art persuaded me to check it out back then. I later had a bad wire in the harness on my 1986 wagon, but got away with just pulling that wire through and out with a new wire attached to fix it.

If you are having a problem with a too lean of a start up on cold mornings there is a modification you can add on to the ECU to give it a slightly richer mixture.

I read this on a post from Art Benstein, sometime ago, that he did it to his car.
I believe he added or changed out a resistor or a diode in or onto a circuit connected in someway with the ECU.
You might check his site http.cleanflametrap.com for it. He has lots of articles.
He might chime in on this thread, if he catches it. He is far more ahead of many on this board when it comes to the electrics.

Don’t know if he still has the car either. He has shown pictures of one going bye bye on a trailer.
He is like me he has had many different Volvo cars over the years. He still has a fleet for his family he takes care of.

Anyway, it’s something to think about and watch for, if you still have an issue with being lean.

Phil