Simple -
1). Check for side to side wobble in the dizzy shaft. If any - fix it.
2) Hook up a dial timing gun and check your timing through the rpm
range - anything out of shop manual spec will show up immediately.
With 125K miles I would take the car to a decent shop to do a complete
tune up diagnostic - the machines can tell if you have timing chain,
dizzy, or rocker wear.
Given the age on your OEM build motor, I might guess that you have a
scored cylinder - at low RPMs compression is compromised and you will
get a slight miss, but as the engine RPM is spun up the compression
will come back and the missing cylinder will start firing again.
125K is a good run for a factory motor. Time to fix it I think. Next
time around throw away the coopers and tecalemite filters and replace
with modern equipment - you will get the motor to last 250K miles that
way.
Alan
On 8/7/07, RAntal243@aol.com <RAntal243@aol.com> wrote:
> Hi All,
> In the twenty five years that I've owned my BJ8, I've driven 125k
> miles. The speedometer indicated 48k when I bought it in 1982. I've never
> done
> anything with the distributor. Over the past few years i've noticed a
> gradually
> worsening low speed miss which usually clears up when over 2000 rpm.
> Correcting this has defied all attempts. The distributor has an electronic
> ignition
> (not Pertronix). Could the low speed miss be due to some failiure of the
> distributor and should I have it rebuilt? It has at least 170k miles on it
> now.
> Thanks for any assistance.
> Rich Antal
>
>
>
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--
Alan
'52 A90
'53 BN1
'64 BJ8
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