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I'm presuming the boost sensor was replaced with one that should not be in that position on the engine. Put your old boost sensor back in and tell me what your reading is. Keep in mind that it is a pressure sensor, not a vacuum sensor like the one on the airbox so if it was not replaced with the exact same part from MB or Bosch or it was not put back in the same position on the engine, it could falsely read that it has 2500 hPa (36psi, or 1500hPa/22PSI (max boost) when removing atmospheric pressure from the reading) at idle when its not. This would also falsely tell the engine that it is already at max boost and disengage the turbo actuator, causing your slow acceleration.
I'm presuming the boost sensor was replaced with one that should not be in that position on the engine. Put your old boost sensor back in and tell me what your reading is. Keep in mind that it is a pressure sensor, not a vacuum sensor like the one on the airbox so if it was not replaced with the exact same part from MB or Bosch or it was not put back in the same position on the engine, it could falsely read that it has 2500 hPa (36psi, or 1500hPa/22PSI (max boost) when removing atmospheric pressure from the reading) at idle when its not. This would also falsely tell the engine that it is already at max boost and disengage the turbo actuator, causing your slow acceleration.
Right on. I will put them back the way they were. They really look the same.
Boost sensor
Boost sensor
Air intake sensor
Air intake
Edit : OK, I put everything back the way it was and the readings are back to normal. The car is working normal again. I will drive it around and see if everything is ok.
Right on. I will put them back the way they were. They really look the same.
Boost sensor
Boost sensor
Air intake sensor
Air intake
Edit : OK, I put everything back the way it was and the readings are back to normal. The car is working normal again. I will drive it around and see if everything is ok.
Scanning the posts, it looks like smoke issue was due to DPF regen cycle not getting deleted from the original tune, and new tune fixed this?
If you can take time to summarize that would be great!
I've considered getting mine tuned, just for longevity but haven't pulled the trigger...
Scanning the posts, it looks like smoke issue was due to DPF regen cycle not getting deleted from the original tune, and new tune fixed this?
If you can take time to summarize that would be great!
I've considered getting mine tuned, just for longevity but haven't pulled the trigger...
Thanks
Are you sure we are talking about the same issue? There was a DPF code earlier for some unknown reason, but it is gone. In summary :
1. The car was running fine until I pumped fuel 2 months ago. It turns out it wasn't my fault, the pump was broken or they did mix it with Gasoline.
2. Car died shortly after fueling (very lucky it happened right in front of the apartment).
3. I have noticed 3 different oil leaks - took the engine apart and changed the oil cooler gaskets.
4. Replaced the crankcase breather control valve, which was totally broken and it was dumping oil into the turbo. The oil was then leaking onto the flaps motor. Replaced motor and flaps control arms with aluminum ones.
5. Replaced oil filter housing gaskets, also leaking onto the belt and steering pump.
6. Replaced the front cover vacuum pump sealing O-ring, oil was leaking badly onto the alternator and intake temperature sensor. The sensor needed to be replaced.
7. Replaced battery, the old battery still good, but not enough
8. Replaced high-pressure steering hose, leaking under the car.
9. After I put everything back together, the car did not want to start and I posted here after watching around 160 videos and read 120 posts haha. The main issue was very low pressure in the rail. Replaced fuel filter, old filter was perfectly good.
10. I did an LP pressure test, checked everything around, no luck - very low pressure still present.
11. After 2 weeks of no start, I replaced the LP pump. It turns out the old was perfectly good.
12. And finally, I realized the fuel is not diesel, but Gasoline so dumped the tank, put fresh diesel. I found the fuel lines on 2 injectors were not properly torqued, that's why the low-pressure issue.
13. All lines checked car started but few issues with the intake pressure, exhaust pressure, and boost pressure were still persistent. It turned out I swapped the 2 sensors - boost and intake pressure.
14. Put the sensors back the way they were, cleared the codes, and voila!! The car is running like new.
I did all this with the help from you guys here on the forum and I am very grateful!! Thank you very much again!
You're right - I'd got 2 threads mixed up.
Yeah, if too much oil getting drawn into motor DPF can get unhappy until it burns off. And any small leak after the turbo will be seeping oil making a mess...
Interesting about the leaking injector lines.
Very good, thanks again.
Is good to have the car back, I'm sure! Happy motoring!
You're right - I'd got 2 threads mixed up.
Yeah, if too much oil getting drawn into motor DPF can get unhappy until it burns off. And any small leak after the turbo will be seeping oil making a mess...
Interesting about the leaking injector lines.
Very good, thanks again.
Is good to have the car back, I'm sure! Happy motoring!
Quick question for you guys. My headlight pressure cleaning system stopped working. I checked the pump today - it works. the second pump for the windshield works too, but the headlight pump does not pump. There is 3.29 volts present at both pump connectors. What should I check next? Is there a relay that does not work properly? Or something else?
05-20-2020, 10:03 PM
