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Hi,
Just poking around, away from the 240's side of things of the board and spotted your post!
I don't own any 900's but the symptoms sound very familiar as both have the same drive train.
The good thing is that your car is doing something on a regular basis. From what you have said, it is having heat related shut downs.
In reading, I see that most of the other posters are picking on the coil or the sparking relay located behind the battery.
There is one fellow talking about a Hall effect sensor mounted inside a distributor that you DO NOT have! That item is on 1988 and sooner model of 240's. I'm pretty sure they all went away with the EZK ignition system on anything Volvo from 1989 up, ... At least for North America.
The behind the battery item mentioned is the middle guy between the ICU, that's under the glove box and the ignition coil itself.
The ICU tells the "power stage relay" to fire the coil by grounding the primary coil side to turn on and back off. This must happen to fire the secondary coil to light up the spark plugs that is attached on the far end of the coil system.
That component is mounted to an aluminum block as a heat sink to keep it cooler.
The special conduction paste goes between these two items and the whole affair is screwed to the fender.
Being that it's behind the battery, it gets over looked for maintenance. Add on the fact there is an electrical connector and a ground wire battery vapors might effect those if the rubber boot has cracked. Just removing and inspecting the connector pins can help renew the connection.
You would be wise to service the two connections and even redo the thin coating heat sink paste that in all likelihood has dried out or oxidize somewhat.
Don't forget the grounding wire out of the harness near there going to the fender.
In the interim, you can try and experiment, of placing a chilled wet rag over the component to see if it restarts sooner or takes longer to shut down before doing anything else.
You can do the same to the ignition coil, but only one of them at a time, to eliminate which one, over the other!
If neither of them work after cooled, then there is one Very Rare possibility and that is the ICU itself, going south.
I have only read about this once and our Friendly poster, Amarin of Malaysian stature, who possibly wrote that one of his friends placed a small computer fan over an ICU to find out it had a problem.
You have to remember that they live very close to the equator down for the love of heat and some humidity!
It's the only ICU failure I ever heard of!
Good luck with finding the issue.
Please post back as it helps all of us!
Phil
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