01268 Mengensteller (oberer Anschlag) Fehler wohl gefunden | Posts 48+

It's getting worse. The car is consuming a lot of fuel, and it requires a lot of pressure on the accelerator pedal just to get up to speed. The fuel consumption reflects this. The car is becoming increasingly unusable.


'Yesterday's tests also included: 4 nozzles from AFN (same opening pressure as the originals). Result = 0. The idle speed control is still completely out of range. Measurement of the crankshaft sensor according to Elsa, and cable check to the control unit. Everything is fine. We couldn't replace the pump because the engine is slightly tilted in the chassis. We couldn't access it. If we put the pump aside for now, could another mechanical defect cause this? Could it be a lack of compression due to a crack or something similar?' We've checked everything so far, except for replacing the pump again, performing a compression test, and occasionally replacing the crankshaft sensor .

I'm at a loss. And that happens very rarely.

mullemaus wrote:

It's getting worse. The car is taking a lot of fuel, and to even get up to speed, you have to press the gas pedal hard. The fuel consumption looks like this. The car is becoming increasingly undrivable.

Then, the (presumably intentionally) adjusted RWG was likely just a makeshift solution to alleviate these symptoms.

Have you checked the NW setting yet?

Next, I would check the compression (possibly performing a "bounce test" beforehand).

Hello,

Again, be sure to check the crankshaft bolt and the secure fit of the timing belt pulley on the crankshaft. That's a classic solution for your problem description.

Sincerely,
Christian

Then the (presumably intentionally) adjusted RWG was probably just a makeshift solution to alleviate these symptoms.

Yes.

Have you already checked the NW setting?

After the belt jumped a tooth, we reinstalled it. That was the day before yesterday. The settings were correct.

Addendum. The camshaft and pump were correct, but the crankshaft was misaligned by one tooth. (The dowel pin and camshaft locking pin fit perfectly.)

Next, I would check the compression (possibly performing a 'bounce test' beforehand).quote]

Yes. Because they already replaced two hydraulic lifters, and the car was making a gurgling sound like an air pump when it was idling.




Even in the 'later' production year? I thought those were only the early models in the 1Z series. We will follow up on the tip, thank you .

Hello and good morning. I think we have found the error. It is probably due to a lack of compression. This likely also affects the incorrect values of the idle speed control. 2.99mg/r + 2.99mg/r + 0.00mg/r
The wear limit is 5 bar. We have reached that limit here. However, we have not yet been able to determine the cause of this.

Attached are the measurement readings.

Cylinder 1: 1st measurement: 24.3 bar, 2nd measurement: 25.6 bar.
Cylinder 2: 30.6 bar.
Cylinder 3: 29.9 bar.
Cylinder 4: 29.2 bar.

mullemaus wrote:

..... It will probably be due to a lack of compression. .....

Ouch... that engine wasn't actually that old.
That thing has been faulty from the very beginning.
Now, you're probably going to cause trouble again...

mullemaus wrote:

Cylinder 1: 1. Measurement 24.3 bar, 2. Measurement 25.6 bar. Cylinder 2: 30.6 bar. Cylinder 3: 29.9 bar. Cylinder 4: 29.2 bar

Hmm, it seems like cylinder 1 is significantly weaker than the others. However, he will still perform, just not at his usual level.

However, I find it hard to believe that an engine with the compression power of "3 1/2 instead of 4" cylinders could be as disastrously weak as described.

IMO, there's probably at least one more bug hidden somewhere.

If three cylinders are working properly and the fourth one is still 'partially alive,' then it shouldn't cause such major problems as you're experiencing. Normally, you wouldn't notice a difference of 5 bar in just one cylinder unless you're paying close attention - there's almost certainly another underlying issue causing the problems.

Okay, the maximum difference between all cylinders is 5 bar (running VW ). We have achieved that. The idle stabilization system cannot compensate for this difference while the engine is idling. (2.99 to 2.99 to 0.00). Therefore, there is an uneven idle and surging in the partial load range. Theoretically, the piston is accelerating less than the other three, which should also cause a deviation from what the crankshaft sensor perceives. The engine has 12,500 km on it @Bertil, and it's coming back. We're getting a refund from the company. It has been a problem from the beginning, and even the second one had the issue. Engine that has just barely reached the 10,000 km mark.