So as long as I remember my truck has always done this, but I noticed this week when it starts to do it. And I'm curious if this is normal for everyone else.

Start my truck in the morning and I jump on the freeway. The truck is still pretty cold, so I take it easy getting up to speed. As we all know, these truck rattle like crazy, but everyday, i hit a certain point driving into town where my trucks normal sound get quiet. It sounds smooth as can be all for about10 to 15 seconds, then immediately becomes rattling again.( those few seconds makes the truck sound amazingly smooth)

So as I am headed to spokane, it does this normal noise reduction again, and i just looked at the coolant temp, and it's quite a bit hotter than it normally is. So i watch it probably get to about 210, the truck gets loud again, and the coolant gauge drops back to 180 quickly, then doesnt do this again till next morning. Stays around 190 the rest of the drive like its suppose to.(I've changed the thermostat before, but the truck noise has always done this as long as I remember. )

What do you guys think? Is it a timing change that occurs? I'm not worried about it, but I am curious. Truck has yet to explode.

 

I have a video of it. It's hard to hear over my ridiculously loud fuel gauge, sorry, havent put a snubber on. But you'll hear it.

 

They said they fixed and tested it there(not sure how) that it passed both times. I think it could be something on the trucks end. I dont know what could cause it to fail, it works for a few minutes, then fails(abs motor keeps running and lights come on. ) I'm no electrical expert by any means, but maybe something with the lines going into the the module itself? Power surge? No idea really. They mentioned something about the mosfet.

 

And they gave me my money back, and said that sometimes these things are just bad. (Again, I'm no electrical expert). They're only like 80 miles south of where I live, maybe i should go pick their brain a bit more, but at this point, it is what it is. They were pleasant to deal with.

 

Side note, the truck does the noise change even prior to being warmed up. Did it this morning driving through town , hadn't reached operating temp yet. But it's usually 5 min or so into driving in the morning. Its oddly random. Could be a VP thing? Almost 260k, and I think it's a stock vp too. 

1 hour ago, Alexio Auditore said:

They're only like 80 miles south of where I live, maybe i should go pick their brain a bit more, but at this point, it is what it is. They were pleasant to deal with.

Maybe worth a try, from what I gather they have a average knowledge person that answers emails and a tech that they hold hostage in the back. The reason I say this is when I emailed them few times for consultation they told me sme things that I already knew and then said if I keep having issues they can ask their tech guy in the back. I was going to pick his brain but my 5 year old issue is mostly resolved now and I think I know the rest of the story, so for now I'm letting it go, too many other things to worry about. 

You guys might look at the brake light switch at the pedal.

I had this damn thing cause me all kinds of issues. Abs, cruise control and ofcourse brake light issues.

1 hour ago, Evan said:

You guys might look at the brake light switch at the pedal.

I had this damn thing cause me all kinds of issues. Abs, cruise control and ofcourse brake light issues.

I got one just in case, haven't changed it yet. I put new rear speed sensor that goes in rear end and the lights went off and are staying off. Although if I scan it with snap on it still shows signal from front left sensor is randomly dropping. Must not be enough to trigger the abs/brake lights. Wish the obdlink did body codes so I wouldn't have to find people that charge money to pull abs codes and tell me that abs sensor is junk. Still don't get it, snap on said rear sensor is bad but on the monitor it showed perfect chart, changed it anyway and no more problems. I hate automobils.