Burning smell when going over 100

[Intuit]

Anyone experienced a faint burning smell entering the cabin, like that of plastic, when going 100mph or more?

It's not oil, and I don't see anything burned in the engine bay.
Started smelling this when I hit 120mph, slowed down to 95mph, went away, slowly increased speed to 100-105mph, and started smelling this again.

I have a HUD, warning me if I hit 95mph, so keep it at below this speed for now, until I know where the smell comes from...

Forum search results...
https://www.google.com/search?q=site:fiestastforum.com+plastic+burning+smell

If you have anything non-OEM, such as an oil catch can with plastic parts, that would be the place to start.

As a test, try turning off the HVAC. It is unlikely but check the blower motor wire harness for evidence of overheating. I only suggest this because a prior vehicle had melted its blower wire harness; but that was due to corrosion.

 

[Sam4]

It's just dollar bills burnin'.....more speed, more need!

 

[MeeLee]

Stock car, burned plastic smell, no smoke.

 

[Intuit]

Bump or get bumped by any chumps? (wreck)

All your wire harness routed properly and in the right place?

Here's an example of a mis-route. In this case the consequence would eventually be abrasion damage...
https://1drv.ms/u/s!AhsZJDCN8kMMi12Nk7qCiJmyivTh

 

[Intuit]

Check this recent post...
https://www.fiestastforum.com/threads/19274-Low-coolant?p=330826&viewfull=1#post330826

 

[MeeLee]

Car is new, never in a wreck. Coolant is good.

 

[TyphoonFiST]

Car is new, never in a wreck. Coolant is good.

Plastic bag stuck on exhaust?

 

[Ford ST]

Plastic bag stuck on exhaust?

That has happened to me before, a huge piece of plastic melted all over.

Sent from my LG-LS997 using Tapatalk

 

[TyphoonFiST]

That has happened to me before, a huge piece of plastic melted all over.

Sent from my LG-LS997 using Tapatalk

I'm pretty sure he blocked me anyways so he cant read what I'm saying!

 

[CB022481]

Plastic bag stuck on exhaust?

maybe stuck on head?

 

[Olephart]

maybe stuck on head?

Particularly if it was the one you brought the sushi home in the other day.

 

[Intuit]

maybe stuck on head?

Particularly if it was the one you brought the sushi home in the other day.

Don't that sushi go on the outside of the bag?

 

[MeeLee]

I guess I'll just prevent surpassing 100mph from now on.
Just too bad, because at 110-125mph this car is so much fun!
Just a little over the legal speed limit.

 

[ChristenHoer]

It can be some electric short problem in the car. Sometimes, that kind of smell can also be felt when we use the heater after a long time.