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I will second Ronald's suggestion and find a spare ECU to test. I had a no-hot restart that cropped up with a pink-label -561 ECU after 230k miles on my move to Alaska. Once we realized what was going on, we would leave the car idling during stops so that we could continue down the road, and only shut it off when we had an hour to kill somewhere or at the end of the day. That no-hot-restart morphed into a no-start about a month later (search my old posts for the whole saga). While all of the checks mentioned below are important and good general practice, this one is easy to check if you have a spare handy, though more difficult to diagnose without cracking the case on the ECU and probing individual components. If you have a -561 ECU, which is likely for an '89, there are a number of acceptable substitutes. I put together a table with the best information I could scrape together here: http://www.nuceng.ca/bill/volvo/database/ecu.htm
Basically, find a -933, -935, -946 or -951 ECU swap it with yours. If yours still has the original -561 ECU, consider yourself lucky and either pick up a spare for testing purposes or be proactive and replace it with a later, more reliable model.
Best of luck,
Zach
Anchorage, Alaska
1990 245 w/278k mi
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