Ahoy there!

Picked up our 2007 TD4 from local garage yesterday.
We had a reconditioned gearbox fitted as original broke. The garage removed the swirl flaps while they were in under the bonnet. The glow plugs + relay was replaced as well.

Two questions:
1. On the way home it was running with "reduced engine performance" for about 10 miles, then it suddenly reverted to normal power again. Was this due to the new gearbox "mating" with the ECU's?

2. The garage removed the swirl flaps, but left the rod in place. The vacuum hose was also left in place.
Should i remove vacuum hose and blank of the openings, or can it be left like this?

Cheers and all the BEST!
Magnus

Last edited by mace on 23rd Mar 2018 12:56 pm. Edited 1 time in total

Hmmm

Engine problem returned today ...

No fault codes registered.

Blast!

Might just be coincidence. With no faults logged I'd try a fuel filter first. Past: FL2 TD4 HSE Auto
Evoque SD4 Dynamic Lux Auto
Present: Audi A3 S Line.

The fault codes from yesterday are as follows.
They were recorded during the last hour of work on her, so still on the lift.

ATCM-Terrain response.
U0100-87 (28)
Lost communication with engine control module 'A'-Bus signal/message failure-missing a message.

U0402-94 (28)
Invalid data recieved from transmission control module - Component failure - unexpected operation.

BCM-Body Control.
U0100-00 (28)
Lost communication with engine control module/powertrain control module 'A'

IPC-Instrument pack.
U0208-08 (2E)
Lost communication with the seat control module A - General failure information - bus signal/message failure.

PCM-Engine I4 Diesel.
P0380-00 (BB)
Glow plug/heater circuit A

RDCM-Rear differential.
U0100-00 (28)
Lost communication with engine control module 'A'

U0401-68 (28)
Invalid data recieved from engine control module/powertrain control module - Algorithm based failure - event information.


This fault code was recorded after i arrived home yesterday:


PCM-Engine I4 Diesel.
P0380-00 (BB)
Glow plug/heater circuit A

Have you got a second earth lead fitted? If not, you need one, it can make a huge difference to reliability. Secondly, I would try a hard reset (lots of info about that on here). If all that fails, then back to the garage I think. With regards to your question 1, I doubt it, especially if the gearbox was functioning normally. Question 2, my feeling is that it should all be left in place but others will know much more about that than me! Good luck.

I'm no expert but that lot looks like the sort of stuff you get when things get disconnected for a while. They could have disconnected the battery whilst the work was being done, for instance. BUT.... they should also have run it all for a while and cleared the fault codes before giving it back to you. MY13 Santorini Black SD4 HSE

Regarding Q2:-
I removed the "secondary air injection" on one of my motorcycles and you had to leave all the solenoids and such in place. Otherwise the ECU can tell it's gone and throw a fault code.
I'd leave it as they have. MY13 Santorini Black SD4 HSE

Take it back to be made fit for purpose as you gave the garage an instruction to make good your car not deliver it back with added faults. FL2 MY10 TD4 GS traded in at 2 years
FL2 MY13 TD4 GS Current

Cheers All!

Extra earth strap fitted last year.

Full ten year service last year.

She will definitely go back on Monday

I'll read up a bit on "hard reset" though

I am a little baffled that she goes "reduced engine performance" and yet leaves no trace when reading codes

Cheers again and all the BEST!
/Magnus

Started her up again this morning, short, sloooow, drive round the block.

Now the "check engine light" came on.

Still no fault codes .... Oh the joy

Hooked her up to the IIDBT tool again,
Now getting:

P2562-63 (AB) Turbocharger boost control position sensor A circuit - algorithm based failure - circuit/component protection time out.

and
P0380-00 (BB)Glow plug/heater circuit A.

The turbo cleared, but not the glow plug.

Back to the garage today, on the back of a lorry ...