1998 1.9 tdi loss of power

change the MAF mass air flow sensor GBP30 on ebay

hi i have bean told it is the number 1 injector with the wire attached you might need it replaced thanks

changing the mass air flow meter will solve this problem.

I had a similar issue to this after I got in a VERY small fender bender (literally) in an 87 Turbo Supra. In my case, my pasenger fender got pushed in JUST enough to crack a charge pipe and cause a boost leak.

Basically, what was happening was the turbo would spool and build boost, the mass fair flow sensor would read all this air coming in and tell the ECU to dial up the the appropriate amount of fuel. When the air reached the cracks in the charge pipe, it would escape out of them. Thus there was a much lower air-to-fuel ratio, causing less fuel to combust, which lead to power loss and black smoke out of the exhaust.

My guess is either an oxygen sensor, or more likely a boost leak.

Good luck mate.

check the rubber pipes are not collapsing ,they run from the air filter to the turbo if they appear ok then replace the turbo

i am having the smae problem with my vw polo tdi apart from its like my turbo cuts out completly and the car will not rev over 3000 at all. there is know lights on in the dash but if its dry weather the car is fine. not to handy when u live in scotland HAHA

how many miles has it done?is it remapped? we have had the same problem and done the same repair as above and the next stage for us is to remove the turbo and strip it down and clean the veins inside the turbo as these can stick and give a loss of power,this is on a 2002 gti tdi pd with +-130000miles and its remapped.my car is gt tdi 130bhp stock 140000miles no faults

ok, lets try to throw few suggestions

number 1 probably problem with air mass meter
number 2 fuel pressure regulator or electrical solenoid on the high pressure fuel for activating-deactivating third piston

can you please send more info when it looses power etc...

I have a 1999 VW golf tdi with intermittent loss of power. The turbo will cut in for a few seconds, then die forcing you to change gear and get a small boost again. The turbo will not boost much past 2200 rpm. The cars computer has been plugged in at the garage and does not show any problems. Various people have said, replace turbo, air mass meter or just simply wash turbo filters in WD40. Can anyone help?

may be a build up of carbon, there are cleaners for your system to clear out carbon deposits and burn higher octane fuel and give it a good run.