F250 2000 7,3l diesel runs strange cold - Ford Powerstroke Diesel Forum
 
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post #1 of 4 Old 04-05-2014, 12:49 AM Thread Starter
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F250 2000 7,3l diesel runs strange cold

Hi!
I have bought a F250 7,3 that runs strange on and off when it is cold. I start it and it idling ok but after a time it have a sound like "pooooh" from the exhaust and it rews up a little. It is the same when i drive, i hear a blowing sound from the exhaust and the engine get lack of performance. When it gets a little warm it disappear and it runs ok the whole time. Once when i pressed the brakepedal a little it directly goes down to normal idling when it stands still. What can the problem be?

P.S. I am from Sweden so my english may be a little weird.
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post #2 of 4 Old 04-05-2014, 01:00 AM
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it's normal. it starts up at normal idle, the exhaust valve closes to hold heat in the engine and it goes into high idle mode for warm up. when you touch the brake pedal the idle comes down so you can shift into gear. if you don't shift into gear, the idle goes back up until the engine reaches a certain temp.
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post #3 of 4 Old 04-05-2014, 01:00 AM
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Its not a problem depending on ambient air temps. Its the Exhaust back pressure valve partially closing. The 7.3 uses it to aid in engine warm up. However it shouldn't activate if outside air temps are above 40 degrees farenheit

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post #4 of 4 Old 04-05-2014, 10:41 PM Thread Starter
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Thanks for fast answers! Altough it feels very weak when I drive and the blowing appears. It feels like when fuel is freezing in the fuel system. Yesterday it was around 37 Fahrenheit when i started it, i don't think the engineheater works. I let it run about five minutes before I started driving and the "blowing" come and go for about 10 kilometers, 6 miles, after that it runs ok.
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