Audi A4 2.5 TDI V6 1998 AFB lack of power - help
Hi I have had my audi for 12 months/ 10000 miles now and I have not been able to get to the bottom of the problem.
The car will only rev to around 3000 rpm in gears, top speed of 75mph, it will rev to 4000rpm in neutral.
Starts fine when cold, can take a few more seconds to start when hot, all glow plugs are broken!
Air fiter has been changed
New MAF (bosch) fitted (although this does show signs of being faulty but performed the same as the old one)
EGR blanked off
All pipe work checked for leaks, splits.
VNT mechanism is very loose and not sticking
VNT actuator seems to go up and down ok
1 error code on Vag com - 00550 start of injection regulation - control limit surpassed - intermittant.
No smoke but if i rev it to 4000rpm in neutral it will puff out a cloud of black soot.
Cam belt was changed by previous owner but i dont think he would have checked the pump timing, I only have free VAG COM so can't check it either.
Does this fault sound like pump timing if so how is it adjusted?
Thanks in advance
similar symtoms on A6 - TDI V6 1998 AFB lack of power
Bought this car recently and didn't really notice there was a problem at first.
99,000 miles with a good service history. Multitronic.
The car will only rev to around 3000 rpm in gears, top speed of 80mph, it will rev to 4000rpm in neutral. Does not pull up hills.
Starts fine when cold, can take a few more seconds to start when hot.
New MAFsensor fitted 4000 miles ago and tank fuel pump. New timing belt 1000 odd miles ago.
Had a turbo fitted 25000 miles/ 4 years ago. Local mechanic suspected the car had been "babied" and has just used a Turbo Clean Kit. Even though he says the Actuator is now has a lot more freedom than before the car is still the same. It has the following fault codes:
01441-158 Sensor for low fuel level - G210
17978 P1570 Control module locked
00523-030 Intake air temp sensor - G42
0053 - 031 Air mass sensor - G70
01176 Key fault low signal. ( I have started using the spare now)
Next step is to change the MAF sensor but he is not sure that this is the problem as fairly new fitted and also the other codes that he is not sure about. I would try to clean the MAF sensor but can't get hold of a anti tamper torx. Tempted to buy a cheap MAF sensor from ebay to try.
Any help appreciated!