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I have a 3-month old '06 ZX4, D20 w/ ATX, with 1900 miles on it (it's not a daily driver) that runs perfectly when it's cold, but after a mile or two, it loses a lot of it's "snap". If I stop after it's at full operating temp and shut it off for a few minutes, when I restart it, it fires right up, but has absolutely NO guts at all until I drive for a short distance...it's actually dangerously slow if I have to pull out in traffic right away. If I step on it I hear the intake sucking, but nothing happens. It's especially bad if I'm using the AC. My wife's '06 ZX5 w/ATX does not exhibit this behavior, and will run circles around mine performance-wise, once mine is warmed up.

I have a CAI and a FS XCal-2, I've tried several tweaked loads of the 87 octane tune, and none have any effect on the problem, which, as near as I can remember, has been there for a couple months.

Has anyone else experienced a problem like this? I hate to take it back to the stealer, even tho it's under warranty.
 

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It sounds like the ambient heat outside is probably causing some detonation. Try lowering the primary fan temp. Other than that, you might want to take it to the dealer- or convert it to a lower temp thermostat if the change in fan cut on temp doesn't help. A colder plug could help too... but with only 1900 miles on a car- I wouldn't go changing plugs.

Of course, also make sure that the CAI tubing is perfectly sealed just in case for some reason that's giving the MAF a bad signal- although I would think it would throw a CEL. One FF drilled holes in the area around his driver's side fog light to let in more fresh air if you want to go that far.

Best of luck-- oh, it might not be a bad idea to check the coolant level, the Ford "gauge" is not really a gauge, and it won't read hot until the motor is ready to overheat.
 
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