Starting problems with the 1Z Megatopic 2

Hi,

For better clarity, a new topic!

First of all, I have to apologize for my unprofessionalism when using VAG-COM (I am, after all, a beginner in this field ).

When logging in at "Basic Settings," the preview light started blinking, and the motor noise changed when accessing groups 000 and 004. In group 000, the start of the feed could not be read (field 2: 000) . I remember that Dennis and I had the same problem with his adapter. Above 1500 rpm, in all blocks in groups 000 and 004, it shows: Error. I can easily imagine that I am one of the lucky ones who have problems with the control unit .

However, I was able to extract some information:

Error code: 00625 (Error text incorrect: Glow plug indicator light intermittent, otherwise no other errors).

Starting behavior with an injection amount of 4.4 mg per injection: unchanged (today, it started immediately when cold, then ran roughly for 3-5 seconds, after which everything was fine).

Driving behavior with the new dosage setting (previously 1.9 mg per cycle, now 4.4 mg per cycle): no jolting was observed in the 5th gear. A noise of 50 km/h can be generated

Start of funding at 000, 2:000 (-> not readable?).

Group 004 (peculiar) at idle: Specified: 17.4°, Actual: 5.2°, Cold Start: 79.3%. Then, accessing measurement blocks in 004: Specified approximately 0, Actual approximately 0, Cold Start: 64%.

@Ulf:

"Channel 4 for initial adaptation setting is not available on my device. I was able to change the values in channel 2 from 126 to 130, which also resulted in a change in the engine's behavior." I'm not sure if this channel is responsible for the delay in the start of the boost, but at least I set the average value to 128 instead of 126.

@Markus:

I'm doing you a favor and having group 000 checked out at the "Friendly" place .

@Gremlin:

That sounds like very reasonable approaches .

Best regards, Christian.

Hi Christian,
Regarding the issue with '000' in field 2, please see here:
/viewtopic.php?t=1773&highlight=vp+37+adjustment

You won't need a friendly person for that either.

Best regards, Andy.

Hi Andy,

that sounds good (or bad) for me

That sounds like a very late start to receiving support. In channel 2 during adaptation, I once tried the two extreme values, and with one of them, there was constant smoke coming from the exhaust, which, for me, indicates that the injection timing was set too late .

I'm going to get my dial indicator right now to check the static injection timing and see if anything has changed... if that's the case, then the valve timing has changed -> crankshaft gear , and then this car will end up in the junkyard .

Best regards, Christian.

Okay, sweating:

I measured the static starting position again using a dial indicator, and it turns out: 0.6 mm -> tolerance range 0.65-0.75 mm.

That means the start of the funding was too late. Now, the question arises: why was it too late? However, I can still rule out the crankshaft pulley.
With the crankshaft in the OT (Top Dead Center) position, it was possible to observe on the locating pin (slightly angled) of the ESP wheel that the distance between the ESP wheel and the crankshaft (via the timing belt) was slightly too short. If the crankshaft wheel had rotated, a delayed fuel injection start would also cause the ESP wheel to be slightly "late" as well. The opposite was the case .

That means that maybe I set it up incorrectly the last time .

I've now set it to 0.72 mm (a little early), and lo and behold, the centering pin fit perfectly!!

During the test drive, in the basic settings, field 2 is still 000 . When I log in, it briefly displays 48, changes the engine sound, and then goes back to 000.

Even when starting the engine after the adjustment, a cloud came out from the back ......however, I also opened the fuel injection lines and the pump itself (->using a pressure gauge), which allows air to enter.

Regarding the duty cycle: at full throttle, it briefly reaches approximately 96 (displayed only for a short time), and the average is 86-89% (measured values).

Let it cool down, then try restarting it... talk to you later.

Hi,
Well, it seems like we're slowly starting to understand the situation.
It's interesting why only a brief value is displayed in the default settings mode. Does the engine noise actually change twice? Once when logging in, and then again when '000' is displayed? That would suggest that the connection is breaking for some reason. If that were to be the case, then the VAG-COM/adapter experts are needed here .
The duty cycle looks good so far .

I wish you good luck for the next launch attempt...

Best regards, Andy.

Hello,

The target value in Block 4, field 4 is 2-10% (duty cycle of the valve for injection start).
If this value is greater than 10, the ESP may be set too late.

@Michael II

According to the error database, the value of 2..10% applies only to idle conditions. Under full load, the value is 60...90%. And that's where Christian is right now.

'Ich bin ein großer Fan von nachhaltigem Reisen und versuche, meinen ökologischen Fußabdruck so gering wie möglich zu halten. Ich glaube, dass wir alle eine Verantwortung haben, die Umwelt zu schützen.'

'I'm a big fan of sustainable travel and I try to minimize my environmental footprint. I believe that we all have a responsibility to protect the environment.'
'Regarding the duty cycle: it reaches approximately 96 (but only briefly) at full throttle, and averages 86-89% (measured values).'


Or have I missed something?

Best regards, Andy.

Andy wrote:

"It's interesting why only a brief value is displayed in the default settings mode. Does the motor noise actually change twice?" So, when logging in, and then again whenever "000" is displayed?

Hi Andy,

The sound changes only when I go to the default settings and THEN press "000 Go (read)". If I go to, for example, "001" or all the way out, the sound goes back to normal. The same thing works with group "004". The preheating indicator blinks during this. While driving (at <1500 rpm), it's similar to the limp-home mode: the engine doesn't respond well to the throttle when shifting. ERROR appears in all fields when the speed exceeds 1500 rpm.

I've already tried changing the values of the files in "Options," but so far, it hasn't worked.

Best regards, Christian.

Andy wrote:

According to the error database, the value of 2..10% applies only to idle speed. At full load, it is 60...90%. And that's where Christian is right now.

Hi Michael,

something else is strange (idle).

Measurement block (approximately):
004: Field 2: 0.3, Field 3: 0.1...4, Field 4 (duty cycle): approximately 60%.

Basic settings (approximately):
004: Field 2: 17, Field 3: 3.5, Field 4: I forgot... but it's greater than 10%.

Best regards, Christian.

haehnlein wrote:

I've already changed the values of the files in "Options" before, but so far without success

.

Hi Christian,

Your adapter 2.2 might be acting up behind the scenes.
I would recommend replacing R1, R3, and R5a with 2.2 kΩ resistors, respectively, as the simplest solution.

Strictly speaking, this is just a shot in the dark, but based on my previous experiences, it's likely in the right direction. That is, the adapter's transmission behavior should improve, and with a bit of luck, this will eliminate those strange symptoms.

A more consistent approach would be to adapt it to version 2.3 or 2.4. Then you should try adjusting the trimmers until you find a position where the adapter works optimally (according to optocoupler standards).

Addendum:
You should definitely try an adapter modification, especially if you see something in the upper left corner of the VAGCOM screen.
- occasionally, the small line, without any new input, doesn't "run" smoothly.
- the measurement data block sampling rate after opening the measurement window, or Opening additional blocks may cause instability.
- In IC/TE/BE reports, numbers other than 1/0/0 are sometimes also displayed.

Problem likely solved.

Hi,

After having extensive chat and email conversations with Andy and Jörg, I just connected the diagnostic system again to my father's Audi 80 1Z, manufactured in 1994.

@Ulf:

"Your adapter works perfectly -> The basic settings are completely applied (especially..." Field 2 displayed in 000)!!!!!!!

In measurement block 004, the car has a duty cycle of 3.1% at idle, not 60% like mine!!!!!!! -> This suggests that my pump is still injecting too late!!!!!

Apparently, the timing gauge readings are really for the cat, because I also adjusted the Audi by 0.7 mm, and it's a bit too early -> but the timing belt is due for replacement soon -> it's stretching!

I'm still waiting, just to be sure, until the new fuel injector is here!!! Hopefully, the adjustment range of the pump will be sufficient.

Best regards, Christian.

YOU ARE THE BEST AND I HAVE A GUILTY CONSCIENCE ->I OWE YOU SOMETHING

It's solved!

I adjusted the pump with the engine running and used the "lazy person's" method with a diagram (setting it slightly too early -> between the center line and the upper tolerance line), and it starts like a bull. While driving at full throttle, the air-fuel ratio appeared to be around 90% at first glance (measurement blocks 004)... but I will check it more precisely.

I had to rotate the pump by at least 3mm (measured at the long hole) until anything at all was displayed in the basic settings . How can the measured value for the start of delivery be so far off using a dial indicator...? I don't understand that . After finding several errors in that stupid Etzold book, I wouldn't be surprised if this value is also wrong -> it's infuriating.

:xFor those starting their funding applications later than ideal, I have devised the following test:

With a cold () engine, use VAG-COM to set the basic settings to 000 (set the injection timing to the maximum late position), and if a large cloud of black smoke comes out and the engine struggles to run, then the injection timing is definitely too late!!

Thank you again to everyone for the TIPS!!!!!!!!!

Best regards, Christian.

Okay, congratulations! I think we're all going to have a beer! Or are we?

Eureka!!

Congratulations.

I INVITE YOU!

So, then a virtual blopp!