Steve -
Sounds like to me you have no oil, or the wrong type
of oil in the dashpot pistons on your carburators.
Pre-firing on accelleration is almost always caused by
this. Also make sure your carburator mixture is
adjusted correctly (yours may be a little too lean).
Regards,
Alan
'53 BN1 '64 BJ8
--- Steve Sanders <ssanders@midsouthinc.com> wrote:
> I need a little help from the list on a misfire
> problem. The car is a 61
> BT7. The car runs great on short trips and on cool
> evening runs. Last
> Sunday I went out for a longer drive than usual.
> Temperature was about 80
> degrees after about 1 hour of driving the car
> developed a misfire upon
> acceleration. It was most noticeable at 3000-3500
> rpm in 3rd gear. It
> kind of sounded like a backfire thru the carburetor.
> The engine temperature
> was 190 degrees. I drove on for about another hour
> - in order to get back
> home and parked in the garage. The next afternoon
> after work I took it out
> for a test run for about 20 minutes it ran
> beautifully. I could not make it
> misfire. I have a petronix ignition and new flame
> thrower coil. The fuel
> pump is in the original location - directly behind
> the driver under the rear
> seat. I replaced the sparkplugs about 200 miles
> ago. Could this be vapor
> lock?
>
> Thanks for the help.
> Steve Sanders
> 61 BT7
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