The 3.5L FI used X to indentify it's a 3.5L, not sure if the 3.5L DI used the same letter since the FI was completely replaced by the DI, but the 3.2L was identified by W, so that always remained the same. So if it's not W and it's a V6 then it's DI. Plus you can always use this awesome tool.
A forum community dedicated to Isuzu SUV owners and enthusiasts. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more!