My brother in law has an 08 lmm. Has 450k miles on it. Just got tuned about three months ago with egr and dpf deletes done. He decided to let my nephew take over the truck and he's been driving it ever since. Well he's pretty rough on it.
Well I get the call a couple weeks ago asking to come look at it. Was told the usual story, well I was just driving along and it started acting weird!
Dang thing sounded like death warmed over... checked balance rates, all injectors were way out of whack. Had my brother in law run compression tests on it, he said all cylinders were above 300. So brought it to my house and swapped out all injectors with new injectors. Also had a code for bad crank sensor so swapped it out too. Cranked up the truck, sounded better but now has a loud tapping sound and still ran rough. Pulled valve covers and every valve was way out of spec, so set lash to .012. Just got it back together this evening, and fired it up. Sounds better, but still has that tap/knock sound. Then it'll do a weird surge. Like it runs out of fuel then get fuel again. Checked and cleared codes and the last set of codes were showing misfiring for all cylinders except number 2.
Sorry for the long post, but have a lot of time and work involved and still not totally fixed yet. Any ideas of what else I need to look at or check? I've got a couple of videos I'll try to load in the morning so you can see what I'm trying to describe..
Well I get the call a couple weeks ago asking to come look at it. Was told the usual story, well I was just driving along and it started acting weird!
Dang thing sounded like death warmed over... checked balance rates, all injectors were way out of whack. Had my brother in law run compression tests on it, he said all cylinders were above 300. So brought it to my house and swapped out all injectors with new injectors. Also had a code for bad crank sensor so swapped it out too. Cranked up the truck, sounded better but now has a loud tapping sound and still ran rough. Pulled valve covers and every valve was way out of spec, so set lash to .012. Just got it back together this evening, and fired it up. Sounds better, but still has that tap/knock sound. Then it'll do a weird surge. Like it runs out of fuel then get fuel again. Checked and cleared codes and the last set of codes were showing misfiring for all cylinders except number 2.
Sorry for the long post, but have a lot of time and work involved and still not totally fixed yet. Any ideas of what else I need to look at or check? I've got a couple of videos I'll try to load in the morning so you can see what I'm trying to describe..
Very sorry.
