Volkswagen Caddy 9kv AYQ, no power

Hello fellow diesel mechanics,


I'd like to briefly introduce myself, as I'm new here.
I am 22 years old and I come from Saxony.
I enjoy working on my own cars myself, as long as the repairs aren't too complicated.

The vehicle in question is a VW Caddy 9kv, first registered in 2003.
It's a 1.9 SDI engine with 64 horsepower.
The engine code is AYQ.


Now, let's talk about the problems this good person is facing.


Unfortunately, the vehicle doesn't have enough power.
When you encounter hills or inclines, the speed immediately drops, and you inevitably end up shifting into second gear. Need to change gears.
Even on the straightaways, progress is rather slow.
I know you can't expect miracles from an SDI, but this definitely isn't a solution.
Overtaking maneuvers are NOT permitted.

Of course, I've already looked into the matter.

What has already been checked or replaced?

Engine wiring harness: checked, OK (Bosch service).
Engine control unit: replaced (as a precaution).
Relay 109: replaced.
Fuel pump: checked, OK (Bosch service).
Fuel shut-off valve: replaced (Bosch service).
Injection timing: set, but misadjusted.
Valve timing: OK.
Various suppliers: checked and approved (by an independent automotive workshop).
AGR valve: checked and in good working order (by an independent automotive workshop).
Diesel filter: replaced (independent auto repair shop).
Intake air temperature sensor: replaced.


The car was at Bosch for 3 days, and they are equally baffled.


Perhaps someone else has a tip or idea about what it could be?



Best regards from Upper Lusatia.

Hello,

Looking at the long list of parts that have been swapped out, it's enough to make you scratch your head. A VCDS diagnostic system would have cost a fraction of that, and you could have checked what's wrong with the car.

Best regards, Rainer.

Hello Rainer,

So many parts were not actually replaced, but rather inspected.
The engine control unit (ECU) was replaced because I was able to get one at a good price.
A VCDS system isn't worth it for me alone.


Sincerely,

Good luck!

Because, as it's stated approximately 1000 times here, support for diesel engine technology is only available to those who have a support key or a diagnostic system from us.

I honestly don't understand how you plan to check the car without a diagnostic system. Just replace a few more parts or scavenge bones from the next barbecue.
Simply toss it over your shoulder backwards, and the bones will reveal the cause of your problems.

You've now had parts replaced, likely for a sum in the low thousands, based on a suspicion.
If the actual performance is significantly worse than the manufacturer's specifications (64 horsepower, 128 Nm of torque, 0 to 100 km/h in 20 seconds), then...
- Check and, if necessary, adjust the valve timing.
- Check the engine's operating data using diagnostic software. Acquiring diagnostic software that not only identifies stored error codes but also helps in troubleshooting more complex issues costs a fraction of what you've likely already spent without success.

Since this concerns diesel engine technology, please also review the terms of service again.
hg
Herbert.

Edit - someone was faster

Herbert is resistant to learning.