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Old 10-25-2012, 01:56 PM   #606
FragNasty
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Join Date: Feb 2010
Location: NC
Posts: 171
My Ride: Car
Quote:
Originally Posted by being3 View Post
Chris at HPF says the he can lower further the TPS voltage to possibly fix my issue. I have also noticed that driving it with the new tune to be lean in the part throttle while cruising so I think my car needs to go down to HPF and just get the tune sorted out once and for all. Ill have to see when they can do it which is up in the air right now
Cruising on the freeway should utilize less than 10% of the available power. As long as the EGT is acceptable, the leaner conditions just means your car is getting more MPG with the new tune.

On the other hand, if the EGT is high, a couple MPGs more is not worth the risk of damaging the engine.

Perhaps it's worth putting in an EGT sensor? What AF reading do you get when it goes lean like this?
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