The color is not the important issue. They could be from different suppliers or different manufacturing dates. What is important is their flow rates. Replacing just one or two injectors can result in them having different flow rates. That has been the source of a lot of Check Engine light problems on 1990's GM vehicles. At high mileage, one or two injectors flow a lower fuel volume resulting in some cylinders running lean. There can be misfires too, so you are chasing misfire fault codes and "running too lean" fault codes. The fix is to buy a flow-matched set of rebuilt injectors. Most manufacturers buy their injectors in flow-matched sets from their suppliers. GM is one of the few that just grab a handful of injectors out of a bin and toss them into the engine with no regard to flow-matching. That does not cause a problem until they have a little wear from high mileage, then the elusive problems start.
Your car is not new enough to have the computer controls that detect misfires, and those that might occur are generally too hard to notice.
Tuesday, December 20th, 2016 AT 6:05 PM