Volvo Owners Club Forum - View Single Post - D5 (D5244T to 2005) - Diesel Knock after fitting a replacement injector

Clan · Mar 7th, 2011, 22:23

The above is correct , volvo use 3 different grades the differences between 1 2 and 3 are miniscule in the amount of fuel they pass these numbers are added after the injectors are tested for flow , so all injectors which are dead on the required specification are marked 2 those that flow slightly less fuel within a certain tolerance are marked 1 and those that pass slightly more fuel are marked 3
All 5 injectors must have the same number and the ECU programmed to suit .
Once you tamper with an injector in any way that grading is lost and you get the troubles you have experienced .

Just buy a new graded volvo injector to match your grade its much cheaper and less hassle in the long term .. ohh and dont forget to renew the corresponding injector pipe , i think they come with the volvo injector ..

Mar 7th, 2011, 22:23	#3
Clan Experienced Member Last Online: Yesterday 23:35 Join Date: Jun 2007 Location: L/H side	The above is correct , volvo use 3 different grades the differences between 1 2 and 3 are miniscule in the amount of fuel they pass these numbers are added after the injectors are tested for flow , so all injectors which are dead on the required specification are marked 2 those that flow slightly less fuel within a certain tolerance are marked 1 and those that pass slightly more fuel are marked 3 All 5 injectors must have the same number and the ECU programmed to suit . Once you tamper with an injector in any way that grading is lost and you get the troubles you have experienced . Just buy a new graded volvo injector to match your grade its much cheaper and less hassle in the long term .. ohh and dont forget to renew the corresponding injector pipe , i think they come with the volvo injector .. __________________ My comments are only based on my opinions and vast experience .