Well i got this 99 V70GLT cheap, It had a miss & couldn't even pop the hood to check, the miss almost feels like it is running on 4 cylinders... Before you ask, I don't know what codes it is throwing, except that the check light is on... My other Volvos are 240's & i got a P1800es, so i never had a need for a OBD2 scanner until now...

So now the things i have checked are the Coil packs (unplugging one at a time) & it seems the number 3 cylinder is not firing. I swapped the Coil packs and it is still pointing towards the Number 3... So i pull the plugs and i got two different plugs in the car, plug 1,2,4 & 5 have Bosh Copper (which almost look new & Gaped at .028)... Number 3 plug is a VOLVO Brand 3 prong plug, (you could tell it was in there for a long, long time)It didn't really have any oil on it, just built up carbon...

Okay so my symptoms are Missing at idle and acceleration. It stays at 800rpm at Idle but you can still hear the miss & of course you can feel the miss when driving.. I drove the car 60 miles and it never actually died on me, nor did it over heat remotely even with the AC on high sitting in traffic... The check light goes on and so does the service engine light, then the check light goes off, while the service engine light stays on... There does seem to be some Blowback threw the PCV system, by looking at the dip stick. But it is hard for me to believe that is what is causing the miss... But it is on my list.

So i guess my next step is go find an OBD2 meter & pull the codes... Come back and do a compression test & see what the numbers are...

My first gut instinct tells me that it has Valve damage, with the Odd ball spark plug on the 3rd & it missing on the 3rd & the looks of a new timing belt. I bet it blew a T-belt and damaged something... Or maybe it is just a bad fuel injector... Or it is not in time, cause it takes a few cranks to start it...

If you think of anything that i might be over looking i would greatly appreciate any advise.