Replaced stock fuel injectors with better flowing Bosch fuel injectors. The fuel rail does not want to sit down on the ends. It pulls away from the mounts and causes the fuel injectors to not sit very deep into the intake. This then caused misfires on cylinder #2 and #7. After some fiddling I managed to rig it up so the intake manifold pushed down on injector to keep it in place. Car runs good. Great improvement over my old stock original fuel injectors. I have more power and my gas mileage increased by 10-20 percent.
Since originally doing this job(2 years latter) I went back in and reset the fuel rail. I was getting an occasional misfire on #2 and #7. I did get the fuel injectors to sit down a bit more before I tightened them down. I still fill like my fuel rail might be bent or something. I do mention in the video that I think it is a design flaw on GM's behalf and I still feel that way. I normally work on German cars and they would have more than 2 hold down bolts for this. My guess is they would have 2 bolts per injector. But in a way the way GM designed it is clever engineering. They saved a few pennies and it works most of the time. My suburban now has 199k miles on it. I keep it around for a tow vehicle and the occasional trip to the mountains. I drove it up during a snow storm a couple weeks back and it performed flawlessly.
29 апр 2017
