VW Bora 1.9 TDI No Power (110 BHP)

**moh** · 23-04-2007,11:12 AM

Hi
I have a Bora 1.9TDI 110BHP (1999)

This car has no performance at all. I have changed the turbocharger and air mass. But nothing. I have also serviced the car.
The car doesn’t make more then 3000 RPM in the 3rd or 4th or 5th gear .

I have noticed when I press the gas up to 3000 rpm the air tube which connects to the top of the engine turns in to vacuum and its not compressed like it should be. Any ideas ??? (But when I take the tube out I can feel some compression but not much)

Thanks
Moh

**ini** · 23-04-2007,02:03 PM

Can you hear the turbo spooling up? Sounds like you are not getting enough boost.

I would check everything on the intake side, from the front scoop/MAF back for leaks or blockages. especialy to and from intercooler & check the intercooler is not fouled, and the pipes are connected properly.

Check the braided hose from the actuator on your turbo to the N75 boost control valve is connected and leak free + check N75 electrical connector is seated properly. Also try removing and cleaning out the N75 with WD40 etc, if operation is suspect.

Ensure that the EGR valve is not stuck open/fouled, remove and clean.

Not sure where the manifold pressure sensor is on a Bora, but check that too.

Is your CAT ok, they can block internally (unlikely).

If the boost pipe from the intercooler is not under pressure i would definitely suspect turbo operation/boost control or a blockage in the intercooler/pipes first.

**moh** · 23-04-2007,02:57 PM

Thank you so much
I will have a look at the parts that you have named
some one told me something regarding a Westgate might be faulty do you think that could be the case ???
I have also had the car cheeked by the VW for any error on the ECU but I got no error

PS do you know any sites with good information regarding the VW turbocharger. I think if I had some clear idea I would be able to understand it more.
Once again thanks for the information.
Moh

**ini** · 23-04-2007,03:07 PM

Only the 90bhp engines have a wastegate, the 110 engines have a variable vane turbo, which deals with excess boot internally.

You have an 'overboost' problem.

This site shows the cleaning and operation of the VNT-15 turbo quite well.

http://www.technologie-entwicklung.d...t15-turbo.html

Make sure that the small hose which connects to the middle of the round actuator valve on the turbo is connected at both ends.

What is the make and part number on your MAF?

**ini** · 23-04-2007,03:18 PM

Your overboost problem could also be caused by other things, please look at this thread too:

https://www.vwaudiforum.co.uk/forum/s...ead.php?t=7044

**moh** · 23-04-2007,03:41 PM

hi
Thanks for replay and your help

I will play around with it at the weekend .
Just one last thing
I will tray to explain this as much as I can

example
I am driving in the M1 at 75 MPH when I get to a part which the road is 20% + up hill as I press more on the gas the RPM moves from 2500 to 3000 RPM at this point the gas is all the way down and I am gaining speed to 85 + miles up hill this will go for 5 to 10 second and then loss of power and the RPM start to come down and the speed start to go down
And when this happens the car has no power even in the down hill
I can feel something cutting off but don’t know what

Oh and when I disconnect the Air mass plug the car is going much faster in 1 and 2 gear even 3rd in flat areas then when its connected ???

So what do you think of this ???

many thanks
Moh

**moh** · 23-04-2007,03:55 PM

hi
Glad some one knows 100% what the are talking a bout I have taken this car to so many dealers and spend so much cash on it. If this works I will buy you a drink
Many Thanks
moh

**ini** · 23-04-2007,04:17 PM

If the car runs better without the MAF connected, your MAF is knackered, and that is causing all your problems.

You can try cleaning it by giving the probe a squirt of solvent through the mesh, but you most likely need to replace it.

Examine both parts of the MAF connector thoroughly for bent pins etc.

Is it a Bosch or a Pierburg MAF?

The current Pierburg MAF for your car is:

Complete MAF part no: 7.18221.51.0 (earlier 7.18221.01.0 is identical)

Just the Pierburg probe/sensor part no: 7.22684.08.0

The Bosch type MAF has a slightly smaller diameter body, and is not interchangeable with Pierburg type. The airbox lid would have to be changed: (you can use the Pierburg probe with small mod)

VW Part No: 06A 906 461

New Bosch Part No: 280 217 121 (latest revision is Bosch 0 281 002 757 or VW 038 906 461C)

Remanufactured: 0 986 280 202

**moh** · 23-04-2007,04:50 PM

I got the MAF new less then 2 month old from VW dealer. Could it be faulty ??? if I change it and it was the same could it be some thing electronics my part number is 038906461c