Hello guys, great community here lots of info. After some searching I haven't found anything relevant.

Whenever I'm driving my truck (98 318 4x4 quad cab) and kick it into a higher gear to climb hills (70-110km) there is a distinct smell of burnt rubber I'm assuming. Then when I bring the rpms back down the smell goes away but it is faintly there when I get out of the pickup, not enough to pinpoint it though.

Any ideas?

 

belt slipping?
antifreeze leaking? it can stink like something burning.
oil leaking from valve covers onto exhaust manifolds?

 

1st off you should be kicking it into a lower gear... to climb hills... but i think u just got your wording mixed up... and as for the burning smell ... your engines getting hotter then normal cus your reving it up and working it... so your at higher rpms and more heat could b the belt slipping or engines getting hot enough to melt a piece of plastic. or from just the shear power from your engine your burning tire all the way up the hill...lol

 

Yes sorry got my wording mixed up.

I know the smell of oil and it has a distinct smell to me. So I do not think it is that.

Antifreeze is a possibility, would there be any amount of smoke in that scenario?

Belts slipping, would this be old belts or lack of tightness?

It has been happening for awhile now I would think if it were a piece of plastic it would be gone by now.

Any input is appreciated!

 

worn out belt tensioner possibly? or if its coolant bypass hose.


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When the engine works hard like that, the exhaust gets hottest out of everything as it has no cooling system. If something is nearby or against it during heavy loads, it could be whats burning up. Could be anywhere from the manifolds all the way down to the tail pipe.

 

What trans do you have? Standard or Automatic? If you have a five speed, I would keep a close eye on my RPMS as it grabs that lower gear and pulls you up hill. Does it seem to shoot up a little before it grabs? If so, you could have a slipping clutch.

 

Good point, if it's a manual, he could be mistaking the smell of a burning clutch for the smell of burning rubber.

On another note, I don't remember but, do these auto transmissions have a vent sticking out of the top like a GM does? If they do and the internal clutch plates of an automatic transmission are burning up the smell could be coming from that vent (if it even exists).

 

Burning antifreeze smells like waffles. lol
I know because I have a timing cover leak.


A burning A/C clutch smells like burning plastic or rubber though.

 

Thanks man I'll never think of waffles the same way again. lol.



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