Glow plug growl

[Crystal Creek]

Ok, ever now and then when I start my truck I hear this weird sound. It happens when I turn the key to the glow plug position. Most of the time it is a quiet low level hum, and sometimes it is a loud growl. Almost sounds like a mini air compressor pump is running. Truck starts great, but the noise is a problem. I just wish I knew what this is and if its normal. I tried a search, but no luck. Please help.

[westcoaststrokin]

I hear a high speed clicking every time I start my truck. Never really thought about it. I just know that the truck starts great everytime even with the temps in the teens without being plugged in. I just use it to know when it is time to kick the key to the start position since I am usually standing outside the truck smoking. I think it is normal but you have me curious now.

[dieseldan2005]

Yep mine does the exact same thing. I asked about this last year and i think they said it was the power brake boost building pressure. Either way nothing to worry about. I will see if i can find exactly what it was, but i though it was in the power brakes.

[dieseldan2005]

Ok i found my old thread and they said it was either the ABS pump or the vaccum pump cycling. I knew it was something like that. It seems to be a common thing. Mine has done it ever since i bought the truck and nothing ever changes.

[Crystal Creek]

just a little more information. It seems the growling sound is coming from the right side of the truck, in the passanger engine bay area.

[Crystal Creek]

Originally Posted by dieseldan2005

Ok i found my old thread and they said it was either the ABS pump or the vaccum pump cycling. I knew it was something like that. It seems to be a common thing. Mine has done it ever since i bought the truck and nothing ever changes.

I am greatful for the help, but I am driveing a 6.0. I noticed yours is a 7.3. I am wondering if that makes a difference, or is the system the same on each of the trucks.

[dieseldan2005]

I'm not sure where the vaccum pump is on a 6.0, but maybe its over there.

[DryHeatDude03]

Yep, most likely the vacuum pump your hearing. Passenger side fender behind the battery.

[somebodyelse5]

Originally Posted by dieseldan2005

Ok i found my old thread and they said it was either the ABS pump or the vaccum pump cycling. I knew it was something like that. It seems to be a common thing. Mine has done it ever since i bought the truck and nothing ever changes.

i hear it too, its kinda loud and then dies down...

I also hear a deep thumb every once in a while from what sounds like is coming from the front right. I was told its the brakes checking themselves? (im a 7.3 guy too, sorry)