It could be the blend door or the fuel bowl. The part that gets me is how it also does it when I have me Forescan hooked up. I'm not sure if it's when I do a 'clear' or 'connect'. I'll check it out.

 

I think the OP is talking about the brief PAAH sound around the same time the wait to start light goes out. My first 7.3 did it, as did many of the ones i test drove before buying my current 7.3. I too, would like to know what makes that sound. My current 7.3, a late 99 doesn't make that sound. No running issues, except for a soft code for the EBPV and no EBPV action on cols start. I can't imagine the EBPV makes that sound though.

 

Now that the blend door has been mentioned, I'll have to try the heater controls in different positions. I guess I could describe it as maybe not a growl but just a low pitched "rrrr"...
I need more home time to tinker with this thing. Maybe I'll start a fix this n fix that thread so I can get input as I have time to do stuff.

 

Because I know from the '73-'79 forum that we all like pics.. here's what I have on my new phone
Same pic basically

 

Who's tires are those?

 

LoL... Mine of course...

 

You know what I meant. Who makes them and size.

 

It was kind of funny...

 

Very funny...Looks like they're afraid to touch the ground.

 

That's the special edition "Gi Joe Crawl Mode"

 

LoL, no worries. They're on the ground now... that's hopefully not a permanent paint job on the wheels either. Clear was so beat up I couldn't stand it.
the tires are ironman, allcountry? They're like an all terrain mud or something
245/70 or 75 I forgot to look this morning but whatever it said was stock on the door sill.
planning on putting same tires on rear.

 

Thought maybe you were "rotating the tires" LOL

 

It's just we all always like to know about new tires and how they wear. Been running Michelin on mine because nothing else seems to last. They look aggressive and wondered how they sound going down the road? That was funny, just not to the point. God bless

 

Can't say I've noticedthat I can even hear them over the 7.3. Friend of mine i bought them from says hes sold a bunch of them & they seem to be wearing really good. I was thinking of putting Hankook dynapro atm on but he wanted me to look at these.

 

Ironman tires were bought by Hercules been doing some research on them. I was looking at these Ironman A/P they look a lot like the Michelin. I'd be interested in hearing how you like the Ironman tires and how they wear.
2 New LT 235/85R16 Ironman Radial A/P Tires 235 85 16 R16 2358516 85R 10 Ply E https://www.ebay.com/i/182239793939