Hi y'all, I just picked up a 1999 V70 XC for a song. Previous owner said it had a misfire but he had no intention to fix it. I took the chance since the price was too good to pass. Heck, even I have to do a head work the price is still not bad.



I took the car home and pulled the code. Sure enough misfire on cylinder 3. When I open the engine cover, first thing I noticed was there was lots of oil under the engine cover. So the PCV is clogged I guess. Then I immediately noticed what might be the cause of the misfire -- someone carelessly drove one engine cover bolt through the ignition wire, so the circuit was completely shorted! I really wish it will be such an easy fix. Still waiting for my compression tester to come and fingers crossed no need for a head work!

I have seen lots of discussion on the coil pack but had a hard timing finding info regarding the ignition wire bundle. I am wondering what my options are: replace the wire with some OEM parts or just solder it? Please advise! Thank you all!

 

start by shopping the OEM parts at tascaparts.com or volvopartswarehouse.com (they include diagrams). Regarding the oil leak, check out Robert FYI's youtube vids on testing PCV clogs (ie dipstick smoke and "rubber glove" test). upper oil leaks can also be caused by the VVT gear and cam seals so best to pull the upper cover on the timing belt to make sure its dry.

 

It is probably the wire soldering will work replacement is quite a job iirc the full coil pack loom has to be replaced