Ok, back with latest update, my car is just back from the local Volvo dealer after 3 days of technical scrutiny and they haven’t found the answer. So to change tack slightly if you had a single coil pack wired up on a bench, what would you do to make melt in a short period of time?, allowing for the...

Sorry Abscate, missed this question, no3 to ground is hard down which I believe it should be.

Back to it, changed the crank sensor, which needed changing, but it made no difference to the coil pack, still overheating within 2 minutes, so I can’t find anything else to test except the ecu. Unless someone knows another answer?

Zero (hard down) on all the coils. Today found the crank sensor base totally destroyed and the sensor floating in a sea of silicone and held in place by nothing but luck and gravity. Managed to get it out without dropping anything into the flywheel and ordered new parts. I don’t know if it will solv...

Hi the diagram is close, my car doesn’t use pin 2, as it’s a turbo, and my trigger wires are A31,30, 50,52,50 respectively from no1, there are lots of different combinations of trigger wire nos. on various sites, I found my version on Matthewsvolvo so assume it’s a correct line up. I don’t think it’...

Have got a spark on all 5 plugs, though on the toasted coil it was weak/erratic, but ok with a good coil. Can’t run it for more than a few minutes as it will melt and I’m running out of coil packs. Most of the coils I’ve used have been second hand,

Hi Abscate and Rick, looked a bit more this evening b4 it got too dark. Checked the signal wire continuity, all ok. The coil only gets hot when running and the 7 ohm reading from 12v feed to ground is on the feed side to the fuse so unlikely to be relevant. Next question- will the coil pack get hott...

Only gets hot when the engine’s running and the coil pack is connected. Wiring and connectors renewed- all ok. No shorts or breaks. Does need a thermometer, you can feel it with your finger as it spreads. Still to check, trigger wire coil pack to ecu continuity and find if wire 3 still has 7ohms to ...

A bit more thinking, if the ecu does not switch down to ground as it should then the flux in the primary is not able to discharge so will quickly overheat the coil and the mosfet and the built in connections in the coil pack thus exasperating the problem. Because the problem is induction based the f...

Have left the car for a couple of days whilst being busy, however I have carried out a compression test (160ish on all cylinders) and put in a new set of plugs, which made no difference. Still no4 coil pack overheating, I have noticed the heat spreads from the end nearest the connector plug, but sti...