When mine did this it turned out to be burnt points.
Yes this can happen to new ones as well.
-jimb
>
> Hi
>
> I have been enjoying this list for a few months but have not posted until
> now. I have a 71 TR- 6 and am having a problem with the exhaust popping
> during deceleration. Last year I had TRF Install the harden seats in the
> head, shouldn’t cause it but included it for background Until this time I
> had a different head on it and never had the popping. So far I have replaced
> the intake and exhaust manifold gasket to the head, replace the by-pass
> valves and then completely blocked them by making a solid gasket, (this took
> care of my idle slowly increasing) thoroughly check for vacuum leaks, all new
> tune up components and checked timing, plugging the vacuum retard seems to
> help but did not take care of the problem, held a rag over the exhaust, while
> at idle to see if I could detect any exhaust leaks, couldn’t find any. At
> this point I am considering removing the intake and exhaust manifolds and
> having them milled to insure a true flat surface. I assume you can mill the
> manifolds, does anyone know for sure? Anyone have any ideas? Any help sure
> would be appreciated, the popping driving me crazy and taking some of the
> fun away.
>
> Thanks in advance
>
> Mark Desenberg
> Maine
## Jim Barbuscia SE Sun Microsystems Kirkland, WA. ##
## http://sunup.West.Sun.COM:80/~jb ##
## Standard Disclaimers apply (Jim.Barbuscia@Sun.COM) ##
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