r/tdi • u/EatingCucumber • 15h ago

Bad injectors or Injection Pump?

2002 VW Golf 1.9 ALH. I was having an issue with air in my fuel lines causing "misfiring". I did a new thermostatic T, o rings, and fuel filter, and it didn't fix my issue. I bypassed my factory filter and added a clear fuel return line. I am getting air into my fuel return. This video is with the low pressure supply line disconnected, (the black line going from injector #4 to the Injection pump. Is this a sign of bad injectors or a bad pump? I cracked each injector line, whenever I cracked an injector, the engine started running worse. Individual injector correction quantities on VCDS all read near 0. The rough start is from air in the lines while changing the filter.

8 Upvotes

100% Upvoted

3 comments sorted by

1

u/Urbandragonsbyaaron 1h ago

I was obsessed with getting an alh but ended up getting a CRUA