Thank you to Michael Porter & TR Householder. Their diagnosis was correct.
The rough running was caused by a broken wire. It was still hanging on by
one or two copper strands, but couldn't carry enough current under load. The
wire that broke was the wire leading from the inner fender to the coil,
routed right over the dip stick. It broke right at the connector on the
coil. When I gave it a gentle tug, it came loose in my hands.
It must have broke when I pulled the dipstick after filling with new oil.
Over the years, pulling the dipstick and hitting that wire must have caused
it to weaken and break.
Ah, the joy of driving that smooth running TR around the block tonight was
incomparable. Sleep well fellow TR listers. I know I will tonight. No TR
worries till next time
-Paul W.
> Help!
>
> My 64 TR4 has been running like a top until now. The only
> thing that is
> different is that I changed the oil, filter & antifreeze this
> weekend. Now
> it stumbles like mad whenever I hit the gas hard. If I baby
> the accelerator
> and work the clutch real slow, it is OK. But any sort of
> quick acceleration
> makes it cough, sputter and hesitate, both in neutral and in
> gear, both when
> cold and when warmed up. It runs fine at 1000, 2000, or 3000
> rpm as long as
> I don't punch the gas too hard.
>
> Is it starved for fuel? Could the fuel pump be going out?
> Maybe electrical,
> it hasn't had a distributor tune up in a few years. I did
> check the plugs,
> they look fine.
>
> I noticed one strange thing during the oil filter change. I
> have the spin on
> adapter, using a fram PH3600. When I took off the old
> filter, the screw-on
> fitting part of the adapter came off with the filter. I
> screwed it back into
> the new filter to loosen up the threads, and then used the
> filter as a wrench
> to screw the fitting back into the adapter. The fitting has
> six holes to
> pass oil through, could it be that the holes are not lined up
> to the fitting.
> Oil pressure is the same as before - 50 lbs. when warm, and
> a little higher
> at startup, or when accelerating.
>
> I realize that it is hard to diagnose without being able to
> hear the car, but
> any help, even guesses would be most appreciated.
>
> Paul Willoughby
> 64 TR4, Strombergs, Overdrive
> Torrance, CA
>
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