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Thread: TR3 missing at high speed / load

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  1. #1
    Jedi Trainee newmexTR3's Avatar
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    TR3 missing at high speed / load

    Hey guys,

    Long time no talk! Haven't been on the forum because I had been neglecting my 3 a bit since I picked up an Alfa GTV6 last summer. The 3 was getting jealous, so I've been getting in some nice roadtrips of late.

    Today, on the way back down to NY from Rhode Island, I started experiencing some skipping at high speed/ load. Basically if I accelerated hard from 65-80 or so, the car started missing. I pulled over, verified I was getting fuel, checked spark plug leads and cap & rotor and didn't notice anything out of the ordinary. I have a pertronix installed.

    I made it back fine, but I'm wondering what is going on. Any ideas on what I should check / what the problem could be?

    Thanks in advance and here are some pics I took recently:




    Cheers,
    Gavin
    '59 TR3A TS66231
    '85 Alfa Romeo GTV6 7215

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    Jedi Knight Darrell_Walker's Avatar
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    Re: TR3 missing at high speed / load


    First thing to check is your fuel filter (if you have one) or the pump float bowl/screen. When they start to get clogged, they can flow enough fuel for low loads, but not when there are higher fuel demands.
    Darrell Walker
    66 TR4A IRS-SC CTC67956L
    81 TR8 SATPZ458XBA406206 (daily driver)
    Vancouver, WA, USA

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    Great Pumpkin TR3driver's Avatar
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    Re: TR3 missing at high speed / load

    The required spark voltage goes up with load, while available voltage goes down with rpm. So I would be looking for anything that affects either one.

    Given that I've had a lot of coil problems in the past few years, I would probably start by taking some quick resistance measurements of the coil & high tension leads. Maybe substitute a "known good" coil if you have one. Wouldn't hurt to change plugs either.

    I've heard of similar problems being caused by a failing Pertronix module, so my next step might be to convert back to points (just to see what effect it has). My TR3 runs better with the Pertronix in the junk box.
    Randall
    56 TR3 TS13571L once and future daily driver
    71 Stag LE1473L waiting engine rebuild
    71-72-73 Stag LE2013LBW waiting OD gearbox rebuild

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    Yoda Gliderman8's Avatar
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    Re: TR3 missing at high speed / load

    I agree with Randall.... I had the same problem on my TR6. Installed a new coil and all is good now.
    Elliot
    Central PA
    1973 TR6 Damson Plum / Biscuit interior, HVDA 5-speed, Good Parts Hubs
    1976 TR6 White/Biscuit interior SOLD
    Nostalgia isn't what it used to be.

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    Jedi Warrior donbmw's Avatar
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    Re: TR3 missing at high speed / load

    I have had the same issue on my TR3. I have had the Petronix fail twice like this. Installed points, new cap, rotor and leads and have not had any problems since.

    Don
    Don
    1959TR3A,2006 Soltice
    1975R90/6,1980R65 & 1982R65 BMW motorcycles

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    Re: TR3 missing at high speed / load

    Sounds like an ignition problem to me as well. If the standard tune-up items don't help, I would swap in a coil.

    I would recommend one of the non-Lucas coils sold by Advance Distributors. I had a Lucas Sport coil totally fail after only a year of driving, it went completely dead instantaneously though.

  7. #7
    Senior Member Anthony_S's Avatar
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    Re: TR3 missing at high speed / load

    Hey I just recently have been having the same problem, even today as I drove the 3 to work. Just wanted to say thanks for ideas on how to take care of it.
    1960 TR3A TS58470 L

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