- Dec 17, 2011
- 94
Picked up a 06 TBext last year with 183k on it and a 5.3. Check engine light came on and flashing and misfiring. Checked codes and have a p0171 and p0300. Tech 2 shows a constant misfire on cylinder #6. Changed wires and plugs today since I don't know when they were changed. #6 plug had a strong fuel smell. Changed #6 coil also. Anyways, it has developed a loud valve tap. I'm guessing a collasped dod lifter. Tomorrow I'll take off the rocker cover. This company makes a tool to free up the lifter without removing the head. https://www.crazedperformancerepair.com/ My question is if this does free up the lifter, will turning off dod with hptuners be a permanment fix for no more lifter collasping- assuming the lifters are good and have not rotated? Do I need to do anything else mechanically other than freeing up the lifter and use hptuners?