AAZ: Hesitant Start, Blue Smoke - Troubleshooting

Hello!!!

I'm having a problem with my AAZ engine! I have to glow it at least 3 times for it to start properly, otherwise it only runs on 2 cylinders , and the other 2 cylinders come on later! And all of this is accompanied by blue smoke. I was told that this could be due to the BOSCH glow plugs! Has anyone had experience with this before ?
The engine is probably not the problem; it only has 30,000 km on it. The pump is also likely not the issue!
I would be very grateful for any advice!

Hi,

I'm not quite convinced about using glow plugs yet, given the current temperatures.
Have you ever taken a look at the 'Technical Articles' section?
Or have you simply tried searching for information about your problem? The technical articles describe how you can test the glow plugs.

Here is the link: https://community.dieselschrauber.org/en/viewtopic.php?t=3094

'I've already checked the spark plugs; they actually work! I've also checked the compression, and that's okay too! The fuel injectors are also fine! It starts well when it's warm outside, but only has problems when it's cold. I'm out of ideas about what else it could be! Someone told me to try replacing the spark plugs with NGK ones, but I'd like a second opinion first.'

I have already checked the candles, and they actually work!

how actually?
Does it function, including the controls?
If you remove the candles and then check something, that's only half the truth.
You didn't actually check the entire control system for the candles.

I can take another look! Maybe I'll find something after all!

zivi wrote:

I can take another look! Maybe I'll find something after all!!

If the terminals of the electrodes are exposed (with a nut), simply connect a voltmeter to each electrode while it is glowing.

Around 10V should be present everywhere.

zivi wrote:

I'm having a problem with my AAZ!

Why do I immediately think of the crankshaft bolt when I hear about the AAZ ? Can someone explain that to me http://home.arcor.de/sgrafen/salatoel/kw_schraube/kw_schraube.html?


/viewtopic.php?t=3313&highlight=crankshaft bolt
/viewtopic.php?t=2564&highlight=crankshaft bolt
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When I installed the new engine, I used the stronger bolt. Additionally, it has a TDI crankshaft with the half-moon alignment, which provides more security against twisting.

Hello everyone,

Last week, I was really stumped by the same starting problems with my Ibiza (230,000 km). In the mornings, with the air temperature around 20 degrees Celsius (in the garage), the engine would only start after about 2 seconds. The next night, I left it outside, which was 10 degrees cooler. The following morning, I had to crank the engine for about 10 seconds before it finally started and idled at 950 RPM. Otherwise, once it was warm, it ran normally.
While troubleshooting, I came across your posts. So, I turned the engine back on and shone a flashlight on the 'tower' of the three pulleys. I could already see an imbalance of about 3 mm. Then I turned the engine off and had it towed to my trusted mechanic. He was almost able to unscrew the crankshaft screw by hand. The crankshaft already showed clear signs of the loose screw. Strangely, a 12.9 grade bolt was installed, but it was still loose. But whatever, it was discovered early enough.
A special cutting tool was used to re-machine the face of the shaft, and a new timing pulley with belt and tensioner was installed. The total cost, including some other minor repairs, was 450 euros. I think it's an unnecessary amount, but it's better than having the clutch slip.

Bertil, thank you very much for your advice regarding KWS.


Regards,
Markus.