Most locale's require a visual inspection (which without the duct, one would fail) as part of their emissions test procedures, and some also require a cold engine emissions test.

So... like said, not having it will not significantly affect the operation of the engine, but without it you won't pass emissions tests.

Hi 'bleeder!

 

ah very true, didn't take that into consideration...

Hi abe!

 

huh. well i actually did pass emissions without it

 

It would too, if the engine was already warm. I think what Abecedarian meant is that it wouldn't pass the visual.

 

well, it shouldn't pass the visual since it is part of the emissions.
but, what do I know?

 

They probably don't have a visual in Washington. How the hell does a tech know what to look for on each and every car that comes in, do they have a book that spells it out for them?

 

heat risers have been standard equipment on nearly every carb'd engine since the late 60's, so ... don't know.

 

I meant for every single emissions component.

 

None of our sixties cars have the heat riser. Our 70 eldorado has one and my old '84 toyota truck had one. Must have been an emissions thing mandated through so many states that test emissions, that it became standardized in the early days. You'd think that an inspector would realize it was missing, but they are a state employee. Go figure!

 

my aunt's 68 firebird had one, my fathers 66 mustang had one.
it's all good though.
and it really only takes a tech to know what it does and how it affects things to say "F" it and let it slide.

so now we have catalytic converters that increase CO2 whereas the old emissions didn't (or at least not to the same degree)

 

I'm curious, were those California cars? I ask because I live in Montana which requires no emissions test, so I find later cars 70s/80s/ have the heat riser. Makes me wonder if auto manufacturers just decided to add that kind of stuff to all engines they made.

 

yes, they were cali cars. we always seem to get the bad stuff first.

 

Thats what I was wondering! LOL!

 

just wondering... i may be talking out my butt, but i think i recall seeing one on my 3vze... is that the same thing??