Hi folks, this might be a bit of a novel so apologies! Going to try to give the full picture here..
My 9-3 has had an intermittent cutting out issue for ages where it would just go dead when slowing down. I thought it was the CPS and a Saab garage confirmed this as it was throwing the relevant code when live scanned. So a new sensor was installed. It ran fine for a week or so then it started to cut out again, only this time it would start up straight away which it didn't before the CPS change..
Also the idle has been getting rougher all the time as if there was a slight misfire when up to temp (not when cold) along with a strong raw petrol smell.
The cutting out got more frequent and the idle worse so I started to look at other things, cleaned the throttle body (which was filthy) and yesterday, the MAF sensor.
Seemed to be running much better until I took it on the motorway and at about 80 it started to misfire violently. I pulled over on the hard shoulder and as I slowed down the engine cut out.
I got recovered but then the breakdown truck broke down (yes really)
So rather than wait another 3 hrs in the cold I decided to risk driving back and the car jerked and sputtered the 2 miles off the motorway cutting out repeatedly.
Today I looked at the plugs and found that they are all filthy and sooty/oilly and worryingly cylinder 3's plug wasn't even screwed in properly! Maybe a thread or two in and the ground electrode is broken off! (see pic)
Took it out for a test with the new plugs and now the turbo is whining really loudly and the car feels very underpowered in low gears!! WTF!! Surely my turbo hasn't died as a result of this?
I feel like there's a clear picture here and I'm just not seeing it. Any thoughts/ insights gratefully received!