Re: [AMC-list] 290 V8 Heat Riser

[Ken Ames <ameskg@xxxxxxxxx>]

I suspect the heat riser isn't the cause of your idling problem, but I could be
wrong. Sounds more like the choke setup. 
I left the heat riser off my summer car - connected the exhaust pipe directly to
the manifold. 

Ken


Quoting John Eckersley <john.eckersley@xxxxxxxxx>:

> I have the 67 and 68 shop manuals, but there's only a brief description of
> the heat riser setup.  Can someone share a bit of wisdom - are they really
> essential on a car that's not a daily driver?  If not, how can I bypass it
> (I think some the Chevy guys wire theirs open or even remove the butterfly
> valve.)? I don't even know if it's working right, but I have some suspicions
> that either it or the auto choke or both may be sticking on - I get a fast
> idle when warmed up that I can clear by "blipping" the throttle, but I often
> get a "splutter" and occasional stall when I move off from rest once the
> engine's warm - it is never happy idling at traffic lights but runs fine
> once at 5-10 mph or above.  There are no signs of overheating - although the
> temp guage doesn't work, I don't get steam etc.
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