Cool Temps = Funny Noise by Engine
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Junior User
Joined: Mar 2006
Posts: 79
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Cool Temps = Funny Noise by Engine
I've had my 99 F-250 for 4 yrs now. Every winter with cool weather, my truck fluctuates after start up for about 10 mins. The exhaust makes a sucking sound out of it and the Rpm's jumps up and down about 200 rpm. If I don't give it enough time to quit, you can feel it while driving. After it warms up it clears up. I've always changed the oil and fuel filters, and use 15w- 40 rotella. Like I said its been doing this ever since I've had it, just wondering if it should be fixed.
Thanks
Chad
Thanks
Chad
Post Fiend
Joined: Jul 2005
Posts: 14,582
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From: 21791
that is normal. Kwikkordead what are you doing up at 3:45 am!
that sound is the Exhaust BackPresure Valve, which closes when the engine oil temperature is below 140* and ambient temp is below 37*. helps warm up the engine when it's cold by retaining the heat and restricting the exhaust flow. LMK if you want to disable this, i can show you how.
that sound is the Exhaust BackPresure Valve, which closes when the engine oil temperature is below 140* and ambient temp is below 37*. helps warm up the engine when it's cold by retaining the heat and restricting the exhaust flow. LMK if you want to disable this, i can show you how.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Originally Posted by strokin_it7.3
that is normal. Kwikkordead what are you doing up at 3:45 am!
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Posting Guru
Joined: Jan 2006
Posts: 1,605
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From: Elkhorn, WI
Originally Posted by strokin_it7.3
that is normal. Kwikkordead what are you doing up at 3:45 am!
that sound is the Exhaust BackPresure Valve, which closes when the engine oil temperature is below 140* and ambient temp is below 37*. helps warm up the engine when it's cold by retaining the heat and restricting the exhaust flow. LMK if you want to disable this, i can show you how.
that sound is the Exhaust BackPresure Valve, which closes when the engine oil temperature is below 140* and ambient temp is below 37*. helps warm up the engine when it's cold by retaining the heat and restricting the exhaust flow. LMK if you want to disable this, i can show you how.
i agree i think it is your ebpv but your rpms shouldnt jump up and down like that.
