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Old 07-29-2011, 06:32 AM
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Chasing down lack of power and low mileage

4x4 model, 125k miles, 4" turbo back, SuperChips at Hi-Perf.

I'm trying to locate a low power issue and a significant decrease in fuel mileage over the past year (11 city regardless if i stomp on it or drive like a grandma). The truck seems like it needs a significant amount of pedal to get moving and the engine cackle is much louder than seems appropriate for the acceleration. I have an AE for testing suggestions.

Front brakes do not appear as if they are hanging. Unsure on rear.

Contribution fails on number 8 due to the CPS, AE shows velocity change of 6% on 8 and 3% on 3. Very common with the CPS issues. All buzz tests and standard tests show normal results. Max boost is easily 27psi, where 50% accelerator usually hits between 10 and 14 psi.

AE graph of ICP, DC%, RPM and Boost attached. Total of 3 runs. Any ideas of what to check next?
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Old 01-03-2012, 06:50 AM
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A follow up for those searching - it was the FPR. AE does not check fuel pressure. YOU should.
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