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Sorry, Bill, really reeks of a bad CPS to me. Let me guess, no Check Engine during cranking, right? A bad CPS rarely ever sets a code. Also, 99% of the time, no Check Engine then no code, especially fatal codes. I have trouble believing it was the ECU reset that got you going, more likely the extra few minutes of cool down while you fetched a wrench and gave it the two minutes. I know you're always quick to figure it's bad caps, but that's the last thought I usually have. My ESR meter can of course find all kinds of aging caps if I go looking. And what about surface caps, do you check and replace those? I can't remember if and how many are in those old ECUs. Of course if you now go for a good used one, it will still have old caps close to working threshold.
Now I had a very similar situation just a few months back. Cold start normally okay, but warm restart not reliable. I got caught out shopping a couple of times. Thought I was going to wear the battery down cranking away, so would take a few minutes break. Often, just when I was about to finally give up it would catch. One day no such luck and I could tell I was pushing my luck on the (newish) battery. I had frozen food melting so called my wife to come get it, also figuring I could use hers for a battery jump as needed or drive me home after a tow truck. 20 minutes later she arrives and I start cranking again, fired right up like nothing was wrong. Would run fine for days and I was too busy to start diagnosing an engine that was running perfectly fine.
One day I had a cold no start, actually the third one. Now having the time, I opened the hood and without hesitating started by checking the integrity of the CPS cable. Hadn't even changed into work clothes. Pulling it off the standoff clips and the insulation immediately cracked and peeled there. A couple of minutes to fetch a 10 mm ratchet, extensions and a universal and it was quickly out, revealing the classic insulation split at the sensor. I thought I had a spare CPS, but forgot I'd already used it. Phoned the local indie shop asking if they had a Bougicord or how long it would take to bring one in from the regiinal distributor. He said they could get me a Facet that day. Said that's the one they were now using and liked, also cheaper then Bougicord. Made in Italy, you can tell it's high quality. Facet is OE for a number of makes. I'm betting as good, if not better than Bougicord. They even include the standoff clips (NLA separately from Volvo). You don't get those with thd Bougicord, but do with the Genuine Volvo CPS. I'm now not going back to Bougicard if I can find a cheaper Facet. I found a really good deal on a Facet on Amazon or Ebay (I forget) and bought it as my new spare.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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