david27

Hi, I'm new to this forum, I'm actually writing this on behalf of my dad, I've been trying to fault find an ongoing issue with his car for the past few months and I'm running out of ideas. His car is a 2003 Jaguar S-type 3.0 v6. Basically it manifests itself with a system too lean on both left and right banks. Sometimes just an engine management light, other times restricted performance also. Below is a storyboard of what I've tried: - New lambda sensors (all 4) - Leak test inlet etc for obvious leaks (found 2 small leaks, both fixed) - Noticed, while monitoring fuel pressure that under harsh acceleration it drops to 35/40 psi. Looking into it, apparently this should hold at 55 +/- 5. - The above prompted me to try changing the fuel filter - this improved it, the car went 500 miles without showing a EML. - In the last 2 weeks this has come back, worse than before now, every journey will result in the EML. To save keep throwing money into things I dont necessarily need, I was wondering if anyone could give me some pointers to try next. For instance, what about the fuel pump in the tank, or is there a regulator in the system that might be at fault? Many thanks, David