E99 7.3 runs better when its on the colder side but loses power when warm - Ford Powerstroke Diesel Forum
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Old 12-04-2013, 11:47 AM
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E99 7.3 runs better when its on the colder side but loses power when warm

Ive got an e99 7.3 that runs alot better when the motor is colder vs warm seems as it gets warmer i lose power. Any idea on why? I dont hot rod it when cold but i notice power is alot better cold than hot it has a ts 6 pos, intake, exhaust and has 246k miles
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Old 12-05-2013, 05:47 AM
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anyone?...
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Old 12-05-2013, 06:23 AM
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What can happen is, and I'm not saying this is your problem without monitoring the engines sensors, because the injection system relies on oil and oil pressure to drive the injection system, that oil viscosity changing with temperature can have that effect.

What weight oil are you using? Thin Synthetics can show a failing HiPres Oil system early.

How long was the last oil change? Tired oil can foam and do this too.

I would want to get it on a good diagnostic scanner and watch the sensors as the engine heats-up to see if there are any drastic changes.
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Old 12-05-2013, 08:35 PM
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Change the oil. If that doesn't make a difference, then replace the injector o-rings. They can leak when they warm up. And I second the scanner. Watch ICP, ICP duty cycle, and do a buzz test just for S&G.
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