Buzzing when cold, using fuel - Ford Powerstroke Diesel Forum

 
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post #1 of 5 Old 12-03-2008, 01:45 PM Thread Starter
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Buzzing when cold, using fuel

I seem to have all of my local fellow 7.3 owners stumped on this one. Here's the problem- When the temperature outside drops to around 32 F, there is a loud buzzing sound under the hood that I cant seem to pin down.

It makes no difference whether it is plugged in or not, and the buzzing doesnt start until I am about a mile down the road. It only happens between 1000 and 2000 RPM approx. if I shift to 5th gear at 35-40 MPH I drop to 1000 RPM and the sound stops. It will also stop if the clutch is depressed or if accelerating, but sound will resume when speed steadies. Also, once the engine is good and warm, (depending on temperature), or if the engine is shut off for a few minutes after initial warm-up, the sound will disappear

The biggest worry is that while it is buzzing, you can watch the fuel guage drop very quickly. Within a few minutes, a quarter of a tank of fuel will be gone. At 4.60 a gallon, this is a little expensive!
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post #2 of 5 Old 12-03-2008, 03:25 PM
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Sounds like you have an issue with your fuel injectors. Is there what appears to be a small forest fire coming out of your tail pipe?

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post #3 of 5 Old 12-03-2008, 03:42 PM
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Quote:
Originally Posted by fyrevyrm View Post
I seem to have all of my local fellow 7.3 owners stumped on this one. Here's the problem- When the temperature outside drops to around 32 F, there is a loud buzzing sound under the hood that I cant seem to pin down.

It makes no difference whether it is plugged in or not, and the buzzing doesnt start until I am about a mile down the road. It only happens between 1000 and 2000 RPM approx. if I shift to 5th gear at 35-40 MPH I drop to 1000 RPM and the sound stops. It will also stop if the clutch is depressed or if accelerating, but sound will resume when speed steadies. Also, once the engine is good and warm, (depending on temperature), or if the engine is shut off for a few minutes after initial warm-up, the sound will disappear

The biggest worry is that while it is buzzing, you can watch the fuel guage drop very quickly. Within a few minutes, a quarter of a tank of fuel will be gone. At 4.60 a gallon, this is a little expensive!

First, Id like to let you know your getting ripped off, we are paying half of that for fuel now.

second. can you let the truck idle, and pinpoint this sound?
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post #4 of 5 Old 12-04-2008, 07:24 AM Thread Starter
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Using the idle control, I ve set it to around 1500 where it seems to be at its worst, and still can t pinpoint where it coming from. No one else can seem to figure out where either, but it very loud inside cab, so I suspect it near firewall.

I haven t noticed any small fires, but to be honest, I haven t specifically looked either. It s cold here now, will look tomorrow.

This is the second winter it has done this, bought July 2007, haven t done a thing to it (knock on wood)
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post #5 of 5 Old 12-04-2008, 08:06 AM
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I would think you would see smoke if that much fuel went missing suddenly. I would check the filters and hoses, the FPR shraeder and assembly, and pray you find it.

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