[Fot] hi rev. miss

[Duncan Charlton]

Intermittent miss?  Steady miss?

I suggest you do a run up with the car parked to see if you are getting 
spark misfire above 4500.  See if you can determine whether it only 
happens under load or if it is simply rpm dependent.  You might be able 
to use a timing light to determine the miss, but at that rpm I kinda 
doubt it.  While you're rustling around in the engine compartment make 
sure you don't have a vacuum leak somewhere.

If you are convinced that you did not witness misfire with the car not 
moving, move on to carburetion.  When you say, "plugs look good" I 
assume you mean light tan -- but that won't tell you enough about your 
mixture unless you do a plug cut with fresh plugs.  Put in at least one 
fresh plug per carb and immediately do a run up through the gears at 
full throttle, cutting ignition and pushing in the clutch when you hit 
the target rpm and then coast to a stop to look at the plugs.

What are the rest of the specs?  Cam, springs, carb needles, etc.?

Duncan
(Texas)


On 2/12/14, 8:11 AM, KENMUN at aol.com wrote:
> took the tr3 to sebring last week end. ran ok except for a miss that occurs
>   above 4500 rpm. car runs stock dissy and coil. components are relatively
> new.  plugs look good. any ideas? thanks ken m. vintage tr3  racer
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