PD -
Are you using copper core wires or graphite suppressor core wires? If
you are using graphite suppressor core wires, they will not work with
the Lucas Distributor Cap. You must use copper (or other metal) core
wires. This can cause all sorts of misfiring problems.
Also, have you checked your fuel pump? Is it dirty or are your fuel
lines dirty? if so, it may not be able to pump enough fuel after it's
gotten hot and your engine is starved for fuel when you stomp on the
gas. Do you have gunk in your fuel tank? If so the lead can get
clogged and starve your car of fuel.
Just some thoughts.
Regards,
Alan
'53 BN1 '64 BJ8
On 6/28/05, pdeturck@rochester.rr.com <pdeturck@rochester.rr.com> wrote:
> Listers -
> A few weeks ago I posted about my 66 BJ8 running rough
> at high (3500+) rpm. I have followed the suggestions of this
> illustrious and knowledgeable list and things are noticeably
> better but the problem now is more specific.
>
> Here's what has transpired so far. What I thought originally was a
> bad coil --- was in fact a coil failing. The replacement coil (high output
> type) made a big difference.
>
> New parts
> ========
> coil
> pertronix ignitor
> ignition wires
> distributor cap
> plugs
> damper oil at 20W and present
> vacuum advance checks out OK
> dynamic timing set
> both HD8 carbs rebuilt
>
> With this configuration, when I first go out for a drive,
> the BJ8 performs wonderfully. There is only the hint of
> a stumble at about 4000+ rpm.
>
> But drive it for while, get it up to temperature and it stumbles
> worse and worse until it almost seems to have a rev limiter at 3000 rpm.
> You can slowly get the rpms up and cruise along fine but any sort of
> moderate or hard accelleration (load) is cause for what sounds like half
> the cylinders missing. Back off and it cruises just fine.
>
> Plugs 1, 2 and 3 are slightly rich looking compared to 4,5 and 6 but all
> in all, pertty clean.
>
> Could I have a distributor problem that is accentuated by heat?
> If so, any suggestions on a remedy?
>
> Any thoughts on other causes?
>
> I have swapped most of the components listed above with other parts
> including a different pertronix ignitor. With exception of the old coil
>(which
> really runs poorly all the time), nothing seems to change the condition
> when hot.
> Could I have a new coil that's bothered by temperature?
>
> TIA.
> -pd-
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