Injector failure and subseqent damage

[eddieh1]

Hello, my first post on here...

I have an A4 2.0 170 tdi 56 plate. about 5 weeks ago the engine stalled and roadside assistance came out diagnosed an injector wiring loom failure.

Several days later, they checked on my warranty situation and fitted a new wiring loom and injector.

The service center called to say my car was ready for collection, but added did i notice any engine noise prior to the stalling. I said no, and was promptly told it was unconnected and nothing to wory about.

Went down later in the day, got the keys and found that the unconnected noise was what can only be described as running on three cylinders.

The car stayed in their car park.

A week later and several calls, I was told it was ready.

It survived the 1 mile drive back to where I work, but upon starting the car again, it made the car shake from side to side and sounded like it was back to 3 cylinders.

The 1 mile drive back involved a mettallic snapping noise from the engine, and no power.

The car has stayed with them since.

Audi customer services were then involved, and suprise suprise they started to talk/keep me informed.

The service manager called to say it was a balance shaft last week.

This week it was another injector, a balance shaft and a snapped cam shaft.

My question's are:

can 1 injector failure cause all this?

can 1 incompetent tech cause this?

What is the possible long term damage? i.e bits of metal floating around for a mile.

What compensation can I expect? Audi have already asked what kind of goodwill gesture i wanted.

I Said i wanted a new engine!!!


Eddie

[a8 tech]

Firstly the initial fault would have been the failure of the piezo injector element short to earth and audi asisit are not audi technicians they are rac.
The original Audi assistance funded by Audi used a6 allroads and in general were all ex audi techs and they were a good set of lads.

As i have mentioned numerous times the failure is not the wiring loom but internal short of the piezo element often caused by one injector failure but followed by the other 3 soon after.

Warranty does not permit more than one injector to be replaced unless there is a stored fault code for the others.

As for your noise then if the counter balance oil pump gear teeth have worn or the oil pump shaft has worn causing the noise and no excess swarf has entered the oil circuit then it is just a case of repairing the oil pump and does not warrant the engine replacement.

The dealer does not have to replace the engine because you think it should as they alone will have to stand the £8000 plus cost if rejected.

There is no connection between injector failure and the oil pump as the injector just stops so no fuel is injected, the oil pump failure is down to wear or poor lubrication/manufacturing materials used for the gear drive/shaft

The third year of the warrant or good will is split between manufacturer and the dealer so the dealer stands the labour and the manufacturer stands the part providing the suggested
repair is within warranty guidelines.

It appears you have two faults and should treat it as such and not attack the dealer.

[patrickhorton]

Do you mean three faults not two? The snapped camshaft must surely be unrelated to the balance shaft but maybe not to the repair of the injector...

[Crasher]

The snapped cam is usually due to a failure of lubrication on a journal along the cam from the drive end, not the fault of the cam itself. Grab hold of a brittle stick (a nodular cast iron cam is brittle) and twist the other end and it will snap, effect not cause.

[eddieh1]

The car has now been back in a few more times.

Still has a problem though.

At approx 55 degrees to 75 (water temperature), the engine seems to skip a beat, the car rocks and a puff of smoke/steam comes out of the exhaust. This happens every 10 seconds and then when i do clear the traffic theres a large cloud following.

First they fitted a restrictor to the egr valve.

This helped but didn't resolve.

They then carried out a diagnostic with me driving.

One of the injectors was delivering approx +2 mg/???

The other 3 were compensating at -0.5mg/??

They have said one day the're not sure what to do next.

Now they say its normal behaviour.

Car's booked in at another dealer now.

Hope someone can help/put my mind at rest becaus it never did this prior to my injector failure.

Thanks

Eddie

[Crasher]

Don’t take any notice of the temperature reading on the gauge, I see them read 90 when they are actually at 75 and still reading 90 at 117, I do not know why they have made the gauge read like this.

Injector compensations can swing all over the place.