TDI won't start, why?

Hi,

I have a problem with my TDI AFN 110 PS engine.

Had a timing belt issue. I took it apart, put it back together, but it won't start.
I was thinking about the immobilizer and took it to VW. There he was for 2 weeks, with a bill of 700€, but I was able to get him back because they couldn't find the error.
{REVIEWED}
Error memory cleared.
Immobilizer checked
Compression measured
Fuel pump, nozzles, and control unit replaced.
Tax-time verified
With Startpilot, it starts.
He also sprays it, but probably at the wrong time or with too little.
A electrician has now determined that the inlet pump is only producing 9.5 volts. Could this be the cause? If so, why could there be too little voltage?


I would really appreciate a response!

Greetings
Snuffbox

Hello,

If he starts the engine with Startpilot and then runs, you probably have the timing belt shifted by one tooth, placed on the fuel injection pump gear.
Did you even solve the ESP?

Hello, Rainer

He starts with the StartPilot, but doesn't continue running independently. I replaced the timing belt myself, and I also had the VW workshop check it a few times; it fits.

The pump was initially untouched. VW then said at some point that the pump might be broken, so I replaced it and took the car back to VW. Same problem, so the pump wasn't the issue.
Same game with tax and nozzles.

Burn chamber is wet, so it's spraying, but probably not correctly, but why??

Hello Schnupfi,

If I understand correctly, he also didn't come to life in the workshop. D.h., the garage guys (if they did at all) only adjusted the pump using the measuring instrument.
Following the description of the problem, I would also strongly suspect a completely malfunctioning pump.

Thank you for the response.

And how do I properly adjust the pump if even the VW workshop can't handle it and still charges me 700 €?
Does this also have something to do with the 9.5V? I think it should be 12V, right?

Do you have a Polo 6N with TDI?


Has your timing belt snapped? If so, do you know why?



Sorry, I can't help you, but I would be interested.


Best regards, Ingo

Yep, that's a Polo 6N with a Golf 3 TDI engine.
The timing belt is not torn. The power cord had a material defect (unfortunately, there was no receipt, so no return/complaint was possible).
The little cam was bent, the timing belt had slipped, and with it the timing chain by 10-15 teeth. All valves and rocker arms are broken. The timing belt is intact.
Head 500 €
Small parts (head bolts, cylinder head screws, etc.) 200 €
VW Workshop 700 €
and it still doesn't work, well, it's a waste of my time.

Do I really have to pay the bill?

I mean, they didn't fulfill their contract! In that case, I would definitely take action. Good, they found the error, but not the solution. 700 € for nothing is really outrageous!

Have you ever contacted Bosch service? Here, I find the people to be significantly more competent than the VW employees.


Having a motor problem is definitely frustrating. In my case, the timing belt on my 6N SDI broke at 56,000 km, so I was wondering if yours also broke. It could also be that it's the same belt...

Best regards, Ingo

schnupfi wrote:

Does this also have something to do with the 9.5V? I think it should be 12V, right?

Hi

It depends on where you measure the 9.5 volts...

At the power supply, at least one connection of the spray adjuster, and pin 5 of the pump connector, a voltage of at least 12 volts should be present.
If not, do you have an electrical fault somewhere --> Relay 109?

If you can read the supply voltage with a VAGCOM while the engine is stationary, you may be able to pinpoint the cause.

Hi,

While I'm not an expert in pumps, I'm curious about one thing:

If I understand correctly, the ESP rotor sits on the cone of the fuel pump shaft (similar to the camshaft rotor). At position 1Z, an additional half-moon disc is located in a groove (similar to the intermediate shaft), which defines the position of the ESP wheel.

At AFN, as far as I know, this is not the case, and therefore, a basic setting of the pump is necessary when the ESP wheel is removed. Since your pump has been replaced, the basic settings might be incorrect (wheel position on the shaft)...this cannot be done with VAG-COM -> Bosch service

Maybe the dog is buried here

Correct me if I'm wrong

Best regards,
Christian