INT looks good BLM is very rich

[bcollid]

I can't figure this out. Why would the INT values look good while the BLMs are almost always very rich around 110. New 383 using DataMaster to log data. Engine runs good the Short term INT hovers around 128 But the BLM is always very rich around 110. I have long tube headers so the O2 sensor is a little down the line. I spot checked a couple of the spark pugs and they look good. I'm going to check the rest of the spark plugs to see if there is anything odd going on in one of the cylinders. Any thoughts. Sort of new to all this. Should I be worried I sort of thought the INT and BLMs would follow each other.

[Vis Croceus]

Originally Posted by bcollid

I can't figure this out. Why would the INT values look good while the BLMs are almost always very rich around 110.

New 383 using DataMaster to log data.
Engine runs good
the Short term INT hovers around 128
But the BLM is always very rich around 110.

I have long tube headers so the O2 sensor is a little down the line.

I spot checked a couple of the spark pugs and they look good.

I'm going to check the rest of the spark plugs to see if there is anything odd going on in one of the cylinders.

Any thoughts. Sort of new to all this. Should I be worried

I sort of thought the INT and BLMs would follow each other.

Your BLM is 110 because either your engine or your tune is broken.

Your INT is 128 because your BLM is where it needs to be to correct for the breakage.