Nachfrage Wastegatelader und Ladedruckregelung | Posts 16+

Hi,
Then I'd like to add my two cents as well .
I strongly suspect that the 'solenoid valve' near the injection nozzle is actually the pressure sensor that everyone is so desperately looking for. "On my AEL (presumably referring to an air-to-water intercooler system), there's a thin hose connected to it that runs over the intake manifold (quite close to the EGR valve) and ends in the pressure hose that goes from the turbocharger to the intercooler."
Since the cable tie that was supposed to secure this hose to the intake manifold eventually broke, the hose came into direct contact with the exhaust manifold connected to the EGR valve, and it simply melted. The immediate consequence was an engine malfunction. Interestingly, the problem disappeared again after the engine speed dropped below ~1500 RPM for the next time.

I'm not entirely sure, but I believe that in a wastegate turbocharger, the boost pressure limiting is controlled by that very valve. So, what would be the purpose of an additional solenoid valve?

Regards,

Olli.

Hi,
Sounds appropriate. You probably overlooked the AGR's magnetic valve during your examination.
As mentioned above and elsewhere, the pressure sensor has a cable with 3 wires, while the solenoid valves only have 2.

@christians

Okay, so the LMM has a flap.

My LDR solenoid valve, if I'm not mistaken, only has 2 cable connections. That means it can't perform a sensor function. Unfortunately, it's dark now, otherwise I would quickly check again. I'm away until Sunday, and then I'll let you know what happened.


@Olli

The wastegate is actually controlled by the LDR solenoid valve.
By the way, there are 3 pressure hoses connected to my LDR valve: 2 at the top and 1 at the bottom.
AND!!!!>> The hose you described was also burnt through on my device. However, it must have been a new one. Surprisingly, it actually worked quite well.
I've now repaired it. However, I didn't do a very extensive test drive tonight. I will do that sufficiently for the next 4 days.


So, either Sunday or Monday evening.

See you then.
Wool.

@Olli

I need to correct myself. The hose that was defective on my machine wasn't the one you described, but it was very similar to your description. On my AEL machine, the hard plastic hose that runs over the suction bridge and connects to the solenoid valve LDR was melted through. It is one of the two upper connectors.
The hose you described leads to... believe it or not... a pressure sensor. I have no idea why I didn't notice this hose for so long...
However, the pressure sensor was no longer attached to the injection mold on the bracket. The car had a new cylinder head installed before my time. I suspect that either it was forgotten during the installation, or the screw was loose and eventually came off. It was hanging quite far away. What the cable is capable of.
I'll check that out, as much as possible. I'm going to the bank tomorrow to take a look at some documents.


@all

Today, I disassembled and cleaned the intake manifold. However, there wasn't much to clean. The part had very little carbon buildup. But the gasket between the intake manifold and the cylinder head on the first cylinder didn't look very good. It wasn't 100% sealed in one corner. I'm not sure about that.
The hoses are all in good condition.

Then today I was finally able to check the boost pressure. However, I still have too little foam in the line. The pointer is still wobbling quite a bit.
But it shows approximately 0.9 bar max and then drops back to about 0.8 bar. Is this normal for this engine? Or is the measuring instrument inaccurate? It's a brand new part from the heating and plumbing industry, and I bought it from OBI.

Does anyone happen to know the turbo boost pressure of the 5-cylinder AEL engine with 140 hp (6-speed) from the year 1996?

I can only test if it's working correctly tomorrow. Then we're back on the highway.

Okay, see you then.


Regards,
Wool.