Also check the IQ if you just purchased the carīecause it is sometimes set incorrectly from the factory or previous owner. It's recommended to check IQ anytime after adjustingįuel nozzles, power chip, or if you just want to adjust the car's level of Incorrect IQ can cause slow downĮngine shudder, rough idling, smoky running, poor starting, poor economy,īasically anything to do with fuel. Injection quantity depends on fuel temperature, rpm, load, smoke, injection duration, coolant An IQ adjustment is also not a substitute for You can use the below procedure on 2004 TDI and newer to check the IQ but you cannot change it. This article focuses onġ996-2003 VW TDI sold in North America or any TDI that use the electronic Bosch With each stroke, is adjustable in your TDI. Introduction This article shows how to test or change the fuel injection quantity on a VWįuel injection quantity (IQ), the amount of fuel injected into the engine Adjusting the fuel injection quantity IQ amount in a VW or Audi TDI pump How to adjust and test fuel IQ with VCDS
