I haven't been to this site in 7 years because all has been good with my '04 with 170k miles on it. Today it started blowing white smoke on and off for a couple of miles then it stopped. A couple of more miles later it started blowing black smoke and chugging only after letting off the gas. Once the engine finally catches, it will run fine without any black smoke until I let off again, like at a stop light. Then it will chug and blow black smoke until it catches again. The last time this happened they replaced the EGR valve under warranty. At that time they flashed it which eliminated the split shot (quiet) idle.
Do I have a bad EGR again? How can I test for this. Is there a good write up on the EGR delete?
Do I have a bad EGR again? How can I test for this. Is there a good write up on the EGR delete?