VCDS and OBD diagnostic device in the On-Board Diagnostics Shop
Diesel, Engine Technology and Vehicle Technology. Repair, Maintenance and Diagnostics (OBD).

sporadischer Leistungsverlust mit Log | Posts 16+

 
Go to page: Previous  1, 2
New Topic Reply 🔗 ⭐ 🖨 Dieselschrauber - Index » On-Board Diagnostics (OBD)
Author Message
neubaupe
Guest




 


Free account, no CAN development support

Post29-03-2010, 20:50    Subject: Quote

Today, I measured the individual reading for the ambient pressure (channel 10), and it's at 1023.
The value seems okay. - Ambient pressure: sea level.

Kann jemand etwas zu den logs / xls sagen? Speculations?

Best regards.
peter


Translated on 09-09-2026, 16:34.
Back to top
neubaupe
Guest




 


Free account, no CAN development support

Post30-03-2010, 0:23    Subject: Quote

I love this forum!
It consists of the three 'L's - Reading, Logging, and Learning icon_wink.gif.

The following symptoms are relevant regarding sudden clicking noises and log file analysis.
Possible catalytic converter damage if the engine is jacked up roughly.
More information to follow soon.


Symptoms: Loss of power, mainly in the higher RPM range, despite a presumably functioning mass airflow sensor (MAF) and correct boost pressure; sometimes, delayed boost pressure build-up in the lower RPM range.
Increased fuel consumption is possible, but usually there is no increased soot emission.
When reading the air mass values at full load, there may be an apparently inexplicable drop in the upper RPM range.
Knocking sounds (resonances) may originate from the direction of the exhaust.
Problems tend to arise more abruptly.
Common causes: The exhaust pipe's cross-section is narrowed due to fragments from a broken catalytic converter or due to an obstruction.
Tests: Tapping test (knocking?) on the exhaust near the catalytic converter.
Troubleshooting by: Replacing defective exhaust parts.
-->>/viewtopic.php?t=3285<<--


Translated on 09-09-2026, 16:36.
Back to top
neubaupe
Guest




 


Free account, no CAN development support

Post31-03-2010, 19:59    Subject: Quote

Test drive without a catalytic converter:
Unfortunately, there has been no change in the performance loss.


Translated on 09-09-2026, 16:38.
Back to top
New Topic Reply 🔗 ⭐ 🖨 Dieselschrauber - Index » On-Board Diagnostics (OBD)
Go to page: Previous  1, 2
Similar articles and topics
Topic Forum
No new posts Octavia 1.8T TDI BMM: Power Loss Troubleshooting Faults & Documentation (Audi, VW, Seat/Cupra, Skoda)
No new posts Power loss without soot Faults & Documentation (Audi, VW, Seat/Cupra, Skoda)
No new posts Power Loss: Air Mass/Boost/Timing OK? Faults & Documentation (Audi, VW, Seat/Cupra, Skoda)
No new posts A4 TDI Intermittent Power Loss, AFN Engine On-Board Diagnostics (OBD)
No new posts Audi A6 Avant TDI: Intermittent Power Loss, 192k Miles Diesel Engine Technology
No new posts Intermittent power loss with VCDS log Upload
No new posts TDI: Intermittent Power Loss - Troubleshooting Diesel Engine Technology
Jump to:  
You cannot post new topics in this forum.