So I decided to put 3 gallons of 110 octane gas into an 1/8 of a tank to see if it improved my start up knock. It doesn't seem to matter what tune I use, I still get the knock. The posted histogram shows 9* retard and at that time it's in CL with good LTFT and Lambda is with 2%. Is this just false knock? I don't have any problems with headers touching my frame or loose metal. I've even tried pulling a bunch of timing to see if it helped and it did not. Once the car is fully warm, it doesn't do any more idle knock except like.1 if I rev a bit in neutral. Bottom end is stock with HE cast pistons.
Any ideas?
cam : 231/248 .617"/.595" 120+5
Thanks for looking
110 octane knock retard test.hpl
Knock at idle.hpt