lack of exhaust at start

brownweiser · #1 (**permalink**) 10-10-2006, 07:27 AM

hi i have a 2000 7.3 just went out camping the temp outside was -10C started my truck daily every time it felt like it was'nt blowing enough exhaust is this normal? would only last a few minutes then it was fine. also when it was warming up the RPM's would rise on it's own until i gave it a little juice then it would drop back down. any suggestions would be appriciated.
thanks

mschn99 · #2 (**permalink**) 10-10-2006, 11:18 AM

thats normal. The butterfly valve in the turbo closes to create more backpressure to allow the motor to warm up at idle faster

**Marty** · #3 (**permalink**) 10-10-2006, 11:23 AM

That butterfly valve automatically closes somewhat to create backpressure and simulates a slight 'load' on the engine. This way, your motor warms up faster. It will usually sound like it is hissing at you as well, after it gets up over 300 degree's the valve opens again and the sound goes away.

**Marty** · #4 (**permalink**) 10-10-2006, 11:23 AM

Marc's too fast for me when I'm at work haha...

brownweiser · #5 (**permalink**) 10-10-2006, 11:37 AM

thanks guys thats exacly what it's doing. thought it might be normal

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