I have had sputtering problems with my 66 TR4A and
have generally found that it is either fuel or
ignition. Vapor Lock will also (fuel) cause this but
I fixed that for good by rotating my fuel pump top 90
degrees. Two years is a long time, check you wires
and point settings.
David G. Whitelaw (slasher_dw@yahoo.com)
78 Spitfire (RIP)
66 TR4A being restored.
--- "Amatruda, Andy" <aamatruda@email.mc.ti.com>
wrote:
>
> After several annoying misfortunes after rebuilding
> the engine I finally put
> the car up on the Highway. Almost all of the
> vibration experienced
> previously is gone due to 1) balancing the wire
> wheels at a business that
> actually knows how to do wire wheels correctly and
> 2) balancing the
> driveshaft. However a couple minutes of highway
> speed brought on
> backfiring/sputtering through the exhaust with a
> significant loss of power.
> When I got off the exit and resumed city driving it
> seemed to "recover".
> Checked under the bonnet; everything seemed OK.
> Went back home and the same
> thing happened (I could barely maintain the speed
> limit).
>
> Things to consider:
>
> The car hadn't been driven for 2 years during the
> rebuild (carbs were
> rebuilt a few years earlier)
>
> The engine has less than 100 miles on it
>
> The gas, although it has stabilizer in it is also
> about 2 years old
>
>
> I suspect a fuel delivery problem. I seem to recall
> a thread about setting
> the floats in the bowls. I have installed Grosse
> Jets and have never felt
> that setting up the floats per the manual is giving
> the desired result so
> this may be a problem. Anyone have any comments
> here?
>
> I'm going to replace my in-line fuel filter a lunch
> to see if that is
> creating a restriction. What else should I check?
> Regards ..... Andy
>
> Andy Amatruda
> Senior Member Technical Staff
> AS&C, M&C
> aamatruda@ti.com
> (508) 236-3219 phone
> (508) 236-3586 fax
>
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