2001 Yukon XL SLT 4x4 5.3L
Problem: No start, cranks over.
History: Had bad fuel (with hydraulic oil)
# Drained and Cleaned tank
# Replaced fuel filter (new pump last year) 50PSI at ACC/pre start Almost 60PSI when cranking
# Replaced all injectors with OEM as well as a coil pack - have spark and fuel at the rails as mentioned above (tried cleaning old injectors and that's when it quit starting)
# All fuses are good.
# Replaced all four O2 sensors, two of which has the wrong connector so I used the factory connectors from old ones and looked up how to match the wires. Positive they are correct. (Would this cause no start) It ran before, so I have rules this out, but maybe?
# Code for TPS keeps showing up, but I replaced that long before this issue and it would start and run before I cleaned injectors...but again, plenty of fuel as and pressure at rails...no debris as far as I know fell into cylinders from injector ports...it tries to start...what am I missing?