2007 GMC Yukon XL 1500 Q&A

2007 GMC Yukon XL 1500 Question: what is causing cylinder not to fire

# 4 cylinder not firing changed plug and wires coil pack is firing cylinder is still missing -
Answer 1
maybe there is something else wrong with the cylinder -
Comment 1
I agree, maybe compression, vacuum leak or you have an injector problem. -
Answer 2
Have an injector balance test performed i bet # 4 is not going to pass! -