I have a 08 Suburban with a 5.3 that was having problems with the DOD. It has 160K miles on it. On a trip to the beach the pressure kept dropping to 20 and the engine would run rough and start tapping. After a while I noticed the pressure only dropped when it went into V-4 mode. Later on that day the engine started ticking intermittently while idling. I thought it was something really bad like a spun rod bearing, but it was consistent with the spark plug firing, which meant it was something cam related.
I ended up ordering the DOD delete kit from Texas Speed and a new cam, the stage 2 low lift cam. Everything looked fine when I did the swap, no wear on the cam or lifters, and it went together without a problem (besides the rust welded collectors, guess the headers will have to wait for new cats.) I programed it with my HP Tuners with a tune from mailordertuner.com and I ran perfectly after a quick drive. But as soon as I took it for a trip to the drive thought it developed a tick in the valve train. So loud it overpowered my cherry bombs when standing from the back of the vehicle. The only problem is it is intermittent and only happened away from the driveway.
I finally got it to do it with the valve cover off one time and narrowed it down to the number 5 intake valve using the hose trick. Nothing seems obviously wrong with the set, but I did notice once I pulled the rocker arm and pushed on the pushrod there was play in the lifter. I removed both rockers from cylinder 1 and they are solid.
Does this mean my lifter is bad? The kit came with replacement non-DOD lifters. Could it have been bad out of the box?
I ended up ordering the DOD delete kit from Texas Speed and a new cam, the stage 2 low lift cam. Everything looked fine when I did the swap, no wear on the cam or lifters, and it went together without a problem (besides the rust welded collectors, guess the headers will have to wait for new cats.) I programed it with my HP Tuners with a tune from mailordertuner.com and I ran perfectly after a quick drive. But as soon as I took it for a trip to the drive thought it developed a tick in the valve train. So loud it overpowered my cherry bombs when standing from the back of the vehicle. The only problem is it is intermittent and only happened away from the driveway.
I finally got it to do it with the valve cover off one time and narrowed it down to the number 5 intake valve using the hose trick. Nothing seems obviously wrong with the set, but I did notice once I pulled the rocker arm and pushed on the pushrod there was play in the lifter. I removed both rockers from cylinder 1 and they are solid.
Does this mean my lifter is bad? The kit came with replacement non-DOD lifters. Could it have been bad out of the box?