Sluggish

Owner of a 2005 S Type 2.7 Diesel. 
 

When I got her, she’d been neglected. I think she’d probably sat for a long time, rarely being used, and even before that had been driven like a mobility scooter. I gave her a full service, which noticeably improved the performance. However, she’s still underpowered. I was starting to accept that the S Type 2.7 just isn’t a fast car, until today. Yesterday, I removed (forgot about the second one lol) one of the MAF sensors, to see if the car stalled (which she didn’t). I’d heard this was proof that the MAF is faulty, but then I read some contradictory info. However, when I turned off the engine and then back on, throttle response (in park) was improved. I went inside, because I’d been out, and then took her out for a spin the next day. Performance was incredible. I knew immediately that she is a fast car — very fast. However, the restricted performance sign came on, even though she was now better than ever. This confused the hell out of me because it should’ve been on before, not now! So I brought her home, went in for a while, because it had started to rain, then went back out later and disconnected and reconnected the MAFS and MAP. After I did this, I went for a drive (restricted performance sign now gone), and she is slower than before.

So now I’m well confused lol. All I can think is that one or both of the MAFs (or maybe the MAP?) is buggered. So I’ve ordered two new MAFs and a MAP. The new MAP, however, appears to have two screw holes, whereas mine has only one. I’m hoping this won’t matter. 
 

If replacing the sensors doesn’t work, I don’t know what to do next. Seems as if I just can’t get her back to her original, optimal performance. She’s definitely running better than ever, though, and that glimpse of her glory days was exhilarating! At least I know now how she’s meant to be. I won’t stop until I’ve nursed her back to full health.  
 

All the best

Marty