slight jolting

Hi.
I have a G4 ASV with 190,000 km. Recently, I've been experiencing a slight hesitation when lightly accelerating (almost in idle). It disappears under load, whether it's full throttle or normal load. There's nothing noticeable in idle either. I replaced the check valve on the fuel filter because air was getting into the system. Now I don't see any air anymore. This has slightly improved the hesitation, but not eliminated it. I suspect it might be the injectors. I still hope that it's not the case.
Do you have any other ideas?
Best regards, Bolzer.

UI

You've already made 37 posts, and you've never encountered one with "stuttering" or "lag"?

The forum is full of posts about it! Please use the search function.

The quick answer: Disassemble and verschandeln the turnout. In extremely, extremely, extremely bad cases, the only solution is a new ESP.

Instructions for cleaning can be found in the technical articles.

m;

Hi.
Sorry, I've tried searching in various ways, but I haven't found a satisfactory result because the described cases either occurred under load or have different effects. I'll still try cleaning the fuel distributor. For me, it feels like I'm experiencing irregular misfires (misfires only as a description). But this only happens when I'm giving it just enough gas that the engine transitions out of the powerband and runs without load. As soon as the download is complete, the stuttering/lagging disappears.
Best regards, Bolzer.

Yes, exactly this kind of jerky behavior under partial load is something that almost all older VP TDI engines eventually experience, and this specific issue has been described before.

Mostly in the higher gears (4th and 5th) and at lower RPMs, e.g., 1200-1400.

m;

@dieselmartin

That was mainly the case with the 1Z engines, right?

Before considering ASV, I would explore other options first.

Yes, it mainly affected the 1Z line.

However, there is no evidence to suggest that it is caused by the MSA12 (which is still an 8-bit system) or by any other unique characteristics of the 1Z.

I think it's more likely that it's simply the statistical age of the 1Zs, which are now massively reaching the 200,000 and 300,000 km mileage marks, and therefore have wear and tear in the MSW (multi-link rear suspension).

His ASV (All-Terrain Vehicle) isn't exactly a brand new vehicle in terms of mileage.

m;

Hi!

I also experienced a slight jerking (more like a bouncing) between idle and a very small amount of throttle. This was particularly noticeable when driving slowly in first or second gear. Sometimes, there was also a slight jerk when engaging the clutch. I initially thought it was related to the clutch. However, when I recently sealed the valve cover and cleaned the throttle body at the same time, the problem disappeared. The chips were clearly visible on the magnet.

Just sharing this as a personal experience, and to let you know that it can also affect people with ALE.
Good luck with the cleaning!

Best regards, Clemens.

The ALE is actually also a 1Z .

m;

That's right, and the ASV is actually a completely different project.


Regarding mileage, the 1Z engine was significantly more prone to issues. In many cases, I've seen cars with mileage below 150,000 km where the bearing material was already starting to degrade.
It has become a problem...


Don't get me wrong, I'm not saying it's impossible, but one should first consider the much more cost-effective alternative solutions. The MSW isn't exactly cheap, especially if you can't verschandeln it yourself.

Quote:

The MSW isn't exactly cheap, especially if you can't verschandeln it yourself.

You can't buy it anyway!

So, either verschandeln the MSW (motor sediment water) filter yourself or replace the pump. I didn't say for sure that it's definitely that. You can only really say that when you're there.

m;

dieselmartin wrote:

UI You've already made 37 posts, and you've never encountered one with "stuttering" or "lag"? The forum is full of posts about it! Please use the search function. The quick answer: Disassemble and verschandeln the turnout. In extremely, extremely, extremely bad cases, the only solution is a new ESP. Instructions for cleaning can be found in the technical articles. m;

it already sounds like

I just want to prevent him from immediately going for the expensive option...

At Bosch, I was told that there is an MSW (Multi System Workshop) available, but it costs 500€ or more.