2012 Isx 2350 475 with codes 4726 and 0559

[ahrenbenjudah]

(03-04-2022 )stevegrutz Wrote:  When you say every injector was leaking except #6, does that mean when you capped number 6 the leakage went under the 200ml with just that one capped?

Nah. When you do the isolation test, you cap off all of the injectors except for one. I started with number 6 being connected to the rail. Then went down the line. Insite gives two ways to do it, if it will run, and if it won't run. My truck definitely won't run on just 1 cylinder so I did the "won't run" test. The "won't run test" is crank until you get a stream, then move the hose in to a graduated cylinder for 15 seconds. Do this twice and take a measurement. Well, #6 barely had 3 drips come out and after cranking, the fuel pressure in the rail maintained pressure for over 5 minutes and still had only deteriorated by about 25%.

Every other injector would give me a stream while cranking and immediately after done cranking, the rail would drop pressure almost instantaneously. #1 and #3 dropped slower than the 2, 4, 5 but they still dropped to nothing within a minute.