> I have a 1974 TR6 which has severe misfiring, hesitation, popping etc.
> It seems that the warmer the car gets, the worse it runs. After about 6
> miles the car won’t idle, the misfiring is throughout the range and both
> at idle and under load:
Sure sounds like something in the ignition... Let's debug that first...
> added electronic ignition (Pertronix Ignitor)
> replaced the spark plugs (Bosch Platinum - WR8DP) gapped to .035
> changed the dynamic timing to 12BTDC
> replace the rotor and cap
> upgraded the coil to Lucas Sport
> replaced the spark plug wires
I would check the following...
Take a timing light, and make sure that the car advances. Watch the
timing marks advance while revving the engine.
Set the timing to 6 BTDC (dynamic) or even at the specification of
4 ATDC to see if there is an improvement. The 10-12 you see people
quote to set timing is a static mark, and I think that you car might
be too far advanced.
Since you replaced the spark plug wires, be sure that you don't have
two wires crossed. The firing order is 1-5-3-6-2-4.
Some rotors cannot accept a large advance. They simply don't have the
range to make the connection. Check to see if you have the smaller
rotor by comparing it to your old one. You *do* still have the old one
right?
After all of this, check for spark on each wire by using your timing
light. You can actually see a misfire this way. (You could even
do this test before chaning anything else to see if you have a
spark problem)
Let us know what you find.
Good Luck!
-Scotty '75 TR6
>
> The oil in the dashpots is fine, I filled them with the oil from Moss.
> When I first start the car cold, it idles fairly well. Its downhill
> after that.
>
> A couple of notes that may help. All of the antipollution equipment has
> been removed, EGR, fuel canisters, etc. All vacuum lines are plugged.
>
> All suggestions are appreciated. Thanks in advance.
>
> Marty Romagni
> 74 TR6
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