1Z Won't Start: Troubleshooting & Fixes

Hi everyone!

I've already read through dozens of search results, but I'm still stuck on my problem.
My 1994 Golf 3 TDI 1Z suddenly stops starting without any warning.
I drove to IKEA, spent about two hours shopping, and then wanted to leave.
Well, and then it wouldn't start anymore.
I now have him standing on the stage at home.
So far, I have:

- Relay 109 replaced.
- Changed electricity provider.
- Diesel filter replaced.

He has never experienced starting problems before, so I'm ruling out the crankshaft sprocket as the cause.

Okay, here's the translation:

"At the outlet of the ESP (Exhaust Gas Recirculation), I disconnected a line and then started the engine. Not much diesel came out! However, fuel does reach the lines at the top of the engine block if I let it run for a longer time."

I'm really at a loss right now.


Does anyone have any other ideas?

Thank you in advance.

Best regards,

Check the valve timing - if the engine is getting air and fuel, it should run.

Does it inject fuel? If you loosen the retaining nuts on the injectors, it's going to spray fuel quite forcefully when you start the engine.

Best regards, Rainer.

dieselschrauber wrote:

Check the timing - if the 1Z engine receives air and fuel, it should run. Does it inject fuel? If you loosen the retaining nuts on the injectors, it's going to spray fuel quite forcefully when you start the engine. Best regards, Rainer

I'm so surprised!
After listening to the engine, I then unscrewed a hose on the outlet side of the ESP. Not much came out.
Then I reassembled everything and removed a locking nut from the block. Afterwards, something sprayed out when I was working on the organ. Whether that's enough is questionable.

Hello,

@slg60
"On my old 1Z, the fuel lines to the injectors were leaking (although it wasn't visible from the outside)."
That was the problem for me; I replaced them and it worked again.

SG.

servusssss wrote:

Hello, @slg60 "On my old 1Z, the fuel lines to the injectors were leaking (although it wasn't visible from the outside)." That was the problem for me; I replaced them and it worked again. SG

And did it suddenly stop working for you too...?
Did it not start at all?

Hi,

My best guess would be cold solder joints in the alarm system. I also sometimes had trouble starting it until I resoldered the connections mentioned above.

However, I would start with the oil leak lines. The investment is quite manageable .

Regards,
A.

"You can try supplying fuel to the engine directly from a canister, bypassing the fuel filter. This will help you determine if the problem is caused by a clogged fuel line or strainer, or if air is entering the system."

What does the error memory contain?

Okay, I just got a new timing belt installed.
- Crankshaft timing mark aligned!
- Camshaft timing mark aligned.
- ESP marking is correct.

It only starts after a very long time of cranking. It runs for about 3 seconds at idle and then turns off again. I can repeat this process dozens of times.

I then sprayed a little bit of starting fluid into the intake manifold, and the engine revved up once to its maximum speed.

Do you have any idea why it's not starting now?

I didn't actually change anything on the ESP, did I? How am I supposed to adjust it if the engine doesn't even have an idle speed?

Best regards,

Are the supply and return hoses on the fuel injection pump reversed?

dieselschrauber wrote:

Are the supply and return hoses on the fuel injection pump reversed?

I didn't even have those anymore.

I'm really at a loss right now.

Does anyone have any other suggestions?

Best regards,

Again: What error codes are stored in the system's memory?

The question has a reason, which may become clear from the entries.

Hi,
zusätzlich zum obligatorischen Auslesen des Fehlerspeichers, schau Dir mal mit VCDS die Sensoren für Druck und Temperaturen an. AIs everything alright?
Specifically, check MWB 1 during engine starting (value 2, EM, and 3, RSW injector voltage). Both values should pulse during starting (ESP is activated) and provide plausible values when the engine is running (approximately 5 mg/stroke, about 1.3 V). Then, in MWB 4, check the target/actual values for the injection start and duty cycle.
Please provide the values or a log.
Does the vehicle have WFS (Wireless File System) or not?
hg
Herbert.

Rüdi wrote:

Again: What is stored in the error memory? The question has a reason, which may be evident from the entries

.


Hi!

There are no errors in memory, except for a potential LMM error.
What was your idea?

Best regards,

"I experienced a broken cable in the wiring harness, specifically in the area connecting the starter to the ESP (Electronic Stability Program), in a Golf 3 and two Passat 35i models within the last six months."

Hi,
Can you please provide more details about the LMM error?
Cable problems could also be a reason for implausible values for EM, RSW, and EZP.
Sure, here is the translation of the text from German to English:

"vg"

This is a common abbreviation for "very good" in German. It is often used in online forums and chat rooms.
Herbert.