Hello,
This is my first post on the forums. I've been lurking here for several years since I purchased my first Volvo, but I've hit a snag that I cannot figure out. I'm hoping someone here might have an idea of where I should go next with this problem.

My 1986 240 has the LH2.2 with Chrysler ignition. I shut the car off to refuel it and it would not restart. Parking lot diagnostics revealed that I wasn't getting a spark and because of that the second coil in the fuel relay would not trigger. I can manually make the fuel pumps run and they seem fine. After towing the car home I ran through the ignition diagnostic flowchart I've become really familiar with by now and it stated to check the wiring or blame the ICU. I poked at the ignition harness and it seems perfect just about everywhere (Unlike the main harness, which is trashed). The problem I'm seeing is that the ICU isn't powering the hall sensor, so I figure the ICU is fried and get a used one from eBay. Plugged the replacement ICU (1346107) into the car and it starts right up, idles fine. No issues. Restart it a few times to test and bam, back to square one with the exact same issue. The ICU has power and is actually kinda hot to the touch (the old one was too, is that normal?) and no power to the hall effect. My next plan was to go nuclear and throw parts at it (another ICU, a replacement ignition harness, and distributor) but if anyone has suggestions I'd love to hear them. Is there anything in the dash that could cause this? I'm not great at reading wiring diagrams (not a mechanic by any means).

Thanks

 

I'm also an owner of a 1986 245. You mentioned at one point that your main wiring harness is "trashed". I believe you should start there if you are going to be throwing parts at it, especially ones that have already been replaced. Not sure how much manipulation you have done to these 30+ year old pieces of biodegradable wiring; but I would look into a new replacement. Dave Barton has them available once again, I understand.