Problem Even Fords Can Not Solve

[Paul Morris]

I have a galaxy 1.9 tdi 53 plate I recently have had to change the radiator and water pump due to a blockage in the radiator. As I drove the car to the garage to be repaired it cut out 3 times (20 mile journey) due to over heating.

Since the repairs the car seems to have no power in 3rd gear onwards, it will run at 70 to 80 ok on the flat but as soon as you ask anything of the engine it starts to shudder especially if you go up hill.

The timing has been checked and is fine, the maff meter has been checked and is fine, I have had a new fuel pump and sender unit, all filters and fuel tank cleaned.

Nothing shows up on the diagnostics and fords themselves seem to be at a loss as to what it can be but will do more checks if I keep paying them

[Smilge]

Have they done a proper diagnostic? What's the performance like in 1st and 2nd and at what revs does the "stutter occur? Could be a number of things that are causing it and it's possibly going into "limp" mode. Need more info I'm afraid.

[Paul Morris]

in first and second it is ok not to bad but when it gets to about 2000 revs the problem kicks in, fords and a private garage have both had it for several days and have done many diagnostic tests but all clear Edited June 11, 2008 by Paul Morris

[Smilge]

Paul did they try and do an "on the road" diagnostic where they can use VAG-COM via a laptop to monitor various sensor outputs. This sounds typically like a turbo overboost problem caused usually by "sticking" vanes produced by a build up of carbon. Do a search on the VNT mechanism which will explain how it works and you may also like to suggest the Boost Pressure Solenoid (more commonly known as the N75 valve). Even so, they should still have shown up on a diagnostic.

[Trucker Dan]

Hi, i know this going to be a long shot, but i have had a simular problem with my 2.3 auto and it turn out to be the exhaust, the cat had gone and was blocking escaping gases.

My be worth checking.

[Smilge]

Yes I have seen that mentioned before Twilight .... good point.

[MatTdi]

Paul,

try and get the fault codes from the garage, if it logged any, that should help in the diagnosis.

I reckon you will get a 17965 - Charge Pressure Control: Positive Deviation, which can be caused by sticky VNT or in my case the T-map sensor failed and registered manifold pressure at over 2000mb so as soon as boost pressure builds it trips in to limp mode, once i replaced it the readings came back down to ~1000mb and bosst worked correctly, alternatively the garage may have knocked a pipe whilst changing the rad and waterpump....

 

If you can get hold of a VAG lead and the software you can easily check the readings on measuring block 011 or get the garage to check the readings for you.

 

Good luck

 

M@