I’m also seeing here that it could be due to either the alternator, Volvo-specific spark plugs (mine are brand new Bosch double iridium), or OEM crankshaft position sensor?

Does any of that make sense?

https://forums.swedespeed.com/showthrea ... -misfiring

Has anyone been able to get to the harness on the backside coils of the V8? It seems to be underneath/behind two tubes? I was able to get to the ground wires back there, but not sure how to get to the harness wires. I am wanting to get to all of the harness wires and inspect them.

UPDATE 1

Okay. Replaced both terminal loops that are over the valves, and made sure the wire was clean and touching clean shiny metal. And cleaned the other two terminals that didn’t need to be replaced.

Same results. Idles a little rough. Still drives like normal besides going about 35-40mph has ...

@jimmy57 I see that the harness has the connectors for each coil, but I’m not sure where to look for “chafing” of the harness. Some spots on the plastic harness that covers the wires are broken and I can see the wires inside, but they aren’t touching metal. Should I check each connector? How do I ...

@jimmy57 Okay I will check the wiring and update once I do. Thank you for the suggestion!

Hello all,

I have been receiving this message, “Slow Down or Shift Up”, for the past week. It happens mostly at lower speeds (30-40mph) or when I really gun it.

I ran into this same message a year ago, and I received these results from the VIDA readings:
ECM-P030000 Random Misfire Detected
ECM ...

Hello. I was reading over this post here, https://forums.swedespeed.com/showthread.php?175302-336mm-rotor-and-caliper-upgrade#/topics/175302?page=3 , and I had a question. I’m just about to upgrade my calipers from the 316mm rotor size to the 336mm rotor size. My biggest concern is going to be the ...