Golf 3 TDI 90hp, running a bit hot

Hello,
I recently bought a VW Golf TDI.
Now, I'm having the following problem.
The car either doesn't reach its maximum speed, or it only does so with great difficulty.

Around 140-150 km/h, it doesn't accelerate as well anymore.
It feels like it's getting fuel in spurts, not consistently.
It only happens at top speed. If I rev the engine to 4000 RPM in 2nd or 3rd gear, there are no noticeable power drops.
It's amazing, like a rocket. (compared to the old Fiat Cinq with 55 horsepower ).

What could be the reason for that?
Usually, everything is fine up to 140.
The hoses in the engine compartment seem to be secure, as far as I can tell.

Even the workshop foreman was at a loss.
but tapped the diesel filter (although he wasn't sure about that either).


I'm going to go to ATU tomorrow and have them read the error codes. Maybe something will show up.

According to the expert, it can't be the LMM (likely referring to a component), because otherwise I would constantly be experiencing a lack of power.

(By the way, it doesn't hurt.)


Sincerely,
Jan.


I hope you can help me.

. . . back to the load balancing.

Hi,

Depending on the year of manufacture, the engine control unit for the 90 hp engine, if it experiences excessive boost pressure (which is most likely to happen in the highest gear, because the engine speed is least likely to "outrun" the turbocharger), does not, as far as I know, enter a permanent limp mode, but instead reduces the fuel injection amount only until the pressure returns to the target range.
Then the full amount is released again, the pressure rises too high again, etc.

This could be easily and clearly checked with a boost pressure gauge.

Otherwise, please check all the hoses around the boost pressure solenoid valve, or just replace the valve as a precaution.

Sometimes, the error memory also provides clues in the right direction.

Diesel filters replaced -> partial success. The symptoms are not quite as severe as they were before.
Error codes read -> Nothing found.

I'll keep an eye on it.

This pneumatic pressure charging valve is okay.
Both the mechanic at ATU and the one at VW are also ruling out a faulty valve.
because it would have resulted in greater losses.

According to their opinion, ultimately only the LMM (likely referring to a mass airflow sensor) is a viable option, but for cost reasons, I'll probably only verschandeln it or something like that.
A new one is too expensive for me right now.

Hi!

However, despite what your mechanic says, I would almost certainly suspect the wastegate valve!
And that's for a very simple reason:
At a mileage of 130,000 kilometers, my Golf 3 TDI with 90 horsepower exhibited exactly the same issues:
Around 140 km/h in 5th gear. The engine suddenly stopped working - it felt like a very strong gust of wind was hitting you head-on.
After briefly letting off the gas and then immediately accelerating to full throttle, it worked again (for a few seconds).
The turbocharger boost valve was replaced in the workshop - since then, everything has been running smoothly again!
It's not that expensive, so I'd give it a try!

Of course, without any warranty .

Markus.

Hello,

Thank you for your contribution, Markus.

I'm going to have the valve replaced.

costs approximately 75 euros.
You can exchange it yourself!

Just unplug 3 hoses and one connector, and then plug them back in .

Arne.

@Arne: Are we talking about the same valve?

I just ordered the part from VW over the phone; it costs €55 including installation.
The part itself costs €29.90.

I'll install it myself, of course. I'm not completely useless.

Actually, I could look it up myself, but I'm not getting any prices displayed in AKTE.
if someone could help me with that, that would be great



Does anyone happen to have the number for the valve?
I can't find anything under the term 'Ladedruck' in AKTE.

The only thing I've found is...
Is that a magnetic solenoid valve?

...it only cost me 25.25 euros here (+ plus an extortionate tax).

The invoice says 'Solenoid valve,' and the part number is:
028 906 283 F.
I would be careful with that number.
Who knows if you need exactly the same part - it sometimes depends on the year of manufacture. Mine is from 1995.

By the way: If you install everything yourself, you can save about 60 euros!
Congratulations!
Of course, the VW technicians checked all the systems beforehand, although they probably already knew where the problems would be. And of course, that comes at a cost.
If only there had been a line item for 'System check windshield wipers'...

Good luck.

Okay, so I quickly removed the valve today.
After that, I went to the highway to test it out.
The issue with the wave-like acceleration is now resolved.
I reached approximately 182 (according to the speedometer).
He reached it after approximately 3 kilometers from the highway exit.
It goes really fast up to 160, but after that, it's rather slow.

Could there be something else wrong? Or could it be related to the fact that I now have 195 tires on 15-inch rims instead of the 185 tires on 14-inch rims I had before?

What makes your 90 horsepower model so great?

G3-TDI wrote:

What makes your 90 horsepower model so great?

Hi.

My wife's ALH Ibiza reaches about 185 km/h after a few kilometers of acceleration, but that's a "real" speed (on a flat, straight highway with no noticeable wind).
At a normal, slightly accelerated speed, that would probably be around 195 [units - e.g., kilometers per hour, miles per hour].

180 entries have been registered.

Hi!

Engine: The good old 1Z.

Once it's properly warmed up, it reaches a speed of 195-200 km/h on a flat road (which is all you find in the Rhineland...).

@ G3-TDI:
Your test, which resulted in 182 km/h, sounds like it might have involved a short warm-up period (testing briefly and then immediately going onto the highway).
Then it's not working for mine either.
I haven't done something like that in a long time.
I just feel too much sympathy for the engine, which has to fight against the brutal frictional forces.
Since I drive 130 km on the highway every day, I have plenty of time for high-speed driving.

I can't think of any other defects.
It's possible (since your Golf is likely used), that it wasn't properly broken in, or that it was driven mostly on short trips.

Hello Jan,

Perhaps you could let a friend drive your car and follow it at top speed to check the smoke emissions from your car.
If it's producing black smoke at top speed (full throttle), the engine might not be getting enough air. In that case, you should check the turbocharger system for leaks and inspect the EGR valve to ensure it's sealing properly and not allowing pressurized air to escape into the exhaust.
Here as well, you should monitor the boost pressure. If the boost is too low, the mass airflow sensor will report an insufficient amount of air to the engine control unit, which will then reduce the fuel injection volume. In this case, further investigation is needed to determine the cause of the insufficient boost pressure (e.g., wastegate, control hoses?).
If the boost pressure is correct, but the mass airflow sensor (MAF) is still showing low values (a diagnostic tool is needed to check the MAF and boost pressure), you can try cleaning it or, for testing purposes, installing a different one.
In this case, also check for leaks in the intake manifold between the turbocharger and the mass airflow sensor, where unmetered air could be drawn in, bypassing the MAF sensor.
If there's absolutely no smoke, your diesel filter might be "clogged," meaning the engine isn't getting enough fuel injected into the cylinders. Of course, the engine will also receive insufficient fuel if there are leaks in the fuel lines. Therefore, no large air bubbles should be visible in the transparent fuel hose between the diesel filter and the injection pump.

Best regards, Rainer.

Hello Rainer!

While I am very grateful for your last post.
However, your assistance was likely intended for 'G3-TDI'. Or?
Because he's experiencing performance issues with his car!
My 1Z purrs up to 200 km/h - so, no problems.

Markus.

Oops, exactly .

I've also heard that with high mileage, the catalytic converter can become clogged, which can prevent the vehicle from reaching its maximum speed. I know someone who gradually started experiencing problems until they could no longer achieve speeds of 160 [units - e.g., km/h, Mbps].
@G3-TDI: Could it be that? *not entirely sure myself*

Okay, but what should one use to verschandeln a clogged catalytic converter? Soot? In that case, the engine would have been running with a lack of oxygen for a long time, so that the catalytic converter wouldn't be able to oxidize the soot anymore. How about trying a tank full of biodiesel and then really burning it off (2 hours of full throttle on the highway, preferably at night). I've heard of 'sulfation' of catalytic converters, which is caused by the sulfur in diesel. However, this is supposed to reverse itself if you use sulfur-free fuels and also let the catalytic converter get really hot (full throttle on the highway). However, the sulfation process is only intended to reduce the effect of the Kats, and I haven't heard anything about it being used for addition.
That would be a perfect opportunity to really go all out again.

Regards,

Eike.