Poor mileage

[98hd]

Ouch, are you pulling in cool air or under hood temp air? Are you sure your 02 sensors are working correctly, cycling from about 100 to 900?

I haven't gotten to move the air filter yet, it is like in your picture, but attatched to where the MAF is after the 90deg elbow. Not sure how to check the 02 sensors to see what they are doing.

[RedHeartbeat]

You need a scanner to read the o2s. The black stuff may be due to detonation. Are you running 85 or 87 octane with the 91 octane tune? What condition are your knock sensors? A scanner will let you know if you're getting knock. Have you pulled the plugs and looked at them?

[98hd]

You need a scanner to read the o2s. The black stuff may be due to detonation. Are you running 85 or 87 octane with the 91 octane tune? What condition are your knock sensors? A scanner will let you know if you're getting knock. Have you pulled the plugs and looked at them?

I've run 92/93 oct gas since day 1. Don't have a scanner. I haven't pulled any of the plugs yet either, but I will and report back.

[98hd]

Didn't have alot of time so I only checked the # 1 and 2 plugs. Both were light gray on the tip and electrode.

These were also put in at the time of the swap, ngk tr55's

Here is a pic.