I've been trying to track down a split in my block learn multipliers (LBL=141, RBL=123) and noticed a knocking noise on only the passenger noise. You can barely hear it from above the motor, but when I stick my head down next to the driver head, I can hear a periodic "diesel noise". So I laid down on the floor by the driver door and could hear a ticking noise. I called my mechanic who replaced all the bearings in the motor and asked him what the deal could be, he asked if I had done a oil change lately. I just did a oil change a week ago with 5w-30 full synthetic Valvoline. He said he thought the oil could be too thin for a motor will 180k original miles. So I'm thinking about adding some Lucas oil additive to thicken the oil up or possible switch to a thicker weight oil, he suggested 10w-40. Any thoughts on what could be causing the noise, be it from the block learn split or thin oil?

 

It could be a rocker arm that needs adjusting.

 

Elevated BLM's can be caused by a "false" lean condition - misfires, leaks in the exhaust before the O2 sensors, faulty )2 sensors, faulty sensor wiring. Some of this has already been discussed in the huge thread you already have going. Generally not a good idea to abandon all the people who tried to help you in the old thread, and start a new thread, without at least providing a link to the old thread. That way people can see what has already been discussed, what has been suggested, and whether you followed the suggestions that were already made. In this case, they could also see the links to the data logs you have posted, and the comments about those data logs.

If you have a "ticking" on the driver's side, and a high BLM on the driver's side, maybe you have an exhaust leak before the O2 sensor that is causing a false lean. Maybe you have a misfire, as has already been suggested.

The BLMs in your cold start log, Cell 16 were 141/120 at the end of the log. The earlier log you posted had 129/112...... two radically different results. As I already noted, all you are doing is letting the engine idle (hence Cell 16) and revving it in the driveway. You aren't going to learn a lot about the engine this way. It needs to be driven. There are 15 more sets of BLM's stored in the PCM. You have no idea what they are, because you haven't logged anything other than idle.

 

I started this thread for the knocking noise and what it could be caused by so the other one didn't get off topic about the BLM split.

I readjusted the rockers using the method while the engine was running and the rockers are much quieter, but the noise is still there.

The mechanic I got to do the refresh thinks maybe an exhaust leak could be the culprit like you suggest Injuneer. I'm just curious about his oil is too thin and the weight he suggested to use.

 

10 40 is a good choice. I would think that would help best. The exhaust leak is common. Be sure to make sure all the exhaust bolts are there and tight.

 

I think it may be an exhaust leak, but to be safe, I want to switch to a heavier weight.