howardjprice

:20:

My 1999 TDi 110 (160k miles) has been on a downward spiral in terms of performance for some time. Unable to rev hard and with a serious flatspot at about 3000 rpm. Fuel economy unaffected (still 45+ in mixed motorway and A-road commuting) but pulling power seriously lacking. Fraud diagnostic drew a blank and itching to change the MAF as a "starter for 10" but my own self test (MAF disconnected, no improvement in performance) convinced me this would just be

I have a manual '99 TDi 110 that has a 3rd/4th/5th gear flat spot starting at 2750-3000 rpm (revs through it in 1st and 2nd but VERY noticeable in 3rd, particualrly when going up hill). Up to this rev range everything is normal. Been living with this for ~2 years after drawing a blank when it was checked out by a so-called diesel specialist who fitted a new MAF (to no effect). Ford garage put it on WDS (whatever that is) yesterday and found no faults (and made no charge - but I am a regular customer). Reading the posts sounds like the TMAP is probably favourite but would that not show on the diagnostics? Fuel economy is better than ever and I get no visible particulates when accelerating as hard as it will go. This makes me think it is under-fuelling because the turbo pressure is not being measured correctly. Any views?