Tue, April 26th, 2011, 08:51 PM
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PHP Groupie
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Join Date: Nov 2008
Location: Among Elk, Deer and Javalinas on the Mogollon Rim in Aridzona
Posts: 3,243
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Quote:
Originally Posted by 38Blackfin
New Gryphon 5000 miles ago, 87 Perf custom tune, 2008 SCrew 5.4, Gotts, Mag SISO, stock cats and y-pipe, 100,000 miles.
New plugs, fuel filter, everything else original, throwing no codes. Did the BG clean thing for the injectors, MAF, TB about 10,000 miles ago.
3 things:
Flat spot 15-1800 rpm, right after a shift typically, push a little harder, drives through it.
Smells lean at start-up. Most 50+ yo's will know what I'm talking about 
Slight knock at hot start, sounds like spark knock.
Other than that runs great, 17-18 mpg average.
thanks!
Randy |
Great mileage! I get 15.1-15.5. I don't have your "flat spot". I wonder if the Torque Converter is locking up too soon? Have you monitored that? And if it is, you can adjust the part throttle lock/unlock points in the Custom Options.
I also don't have the spark knock at hot start or the "lean smell". I doubt this is a significant worry, since it is a fairly momentary condition.
Did Bill try to write you a tune to maximize economy?
I really only worry about spark knock under load, or at cruise.
- Jack
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2024 F150 Platinum SCrew 3.5L PowerBoost FX4, Peragon Tonneau Cover, LineX Bed, 35% Window Tint on All Sides and Rear, Full Nose Paint Protection Film, Husky Mud Guards, Lasfit Floor Liners, VIOFO Dash Cam
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