[TR] TR3A Woes
trguy75 at gmail.com
Sun Nov 17 11:17:34 MST 2019
Thanks for all the feedback! On another 3 I just sold, I had the same issue with mechanical fuel pump and cam lobe and replaced with low flow electric fuel pump. Fixed problem perfectly. This car has electric fuel pump. I turned two more flats rich and also forgot to top off the dampers with oil. That did the trick. I could probably bring the idle down to 750, but then the hood vibrates with an awe full noise at the latch. Haven’t sorted that yet, but it doesn’t do it with idle at 900.
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> On Nov 17, 2019, at 9:16 AM, TeriAnn J. Wakeman <tjwakeman at gmail.com> wrote:
> First of all, never get too focused on fuel circuits that you ignore the ignition circuit. Both have the same symptoms. That said, it wouldn't hurt to look at your fuel pressure at idle. if the flow is too low at idle the float chamber may not stay full. Had that problem with my current reground cam. The fuel pump lobe only partially moved the pump leaver giving me almost zero fuel pressure at idle. An electric fuel pump was cheaper than replacing an otherwise good cam and cured my off idle hesitation problem plus smoothed out my idle. It also wouldn't hurt to check your spark in case of a weak coil.
> 900 RPM seems like a very high idle. Why do you have it set so high? Might be a clue.
> 1961 TR3A (built spring of 1960)
> 1960 Land Rover Dormobile
> Don't need anything else.
> On 11/17/19 6:09 AM, Jim Henningsen wrote:
>> Good morning,
>> My 61 TR3A is coughing a bit and I need some help diagnosing. Healthy motor, stock dizzy, points, red rotor. I replaced the seals on the jet bearings and went through the procedure to balance and set mixture. Idles nicely at 900 rpm, choke works well. Once warmed up though, it has a bad hesitation when I push the gas pedal down a third of the way from idle. It coughs and if I donâ€™t pump the throttle will stall. Very consistent. The mixture adjusting nuts are turned down 10 flats. It does run smoother without hesitating with choke on which makes me think it is still not rich enough.
>> Any thoughts would be much appreciated while I drink my coffee and try to keep warm in the frigid south. 50 degrees this am in Florida.
>> Jim Henningsen
>> Ocala, FL
>> 61 TR3A
>> 62 TR4
>> 75 TR6
>> 81 TR8
>> 82 Jeep CJ8
>> Sent from my iPad
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