The high idle may itself be a symptom. Of what, I don't know. But I know
that once in a while, while doing a tune-up, I have this problem where I
can't lower the idle below 1200-1500 even though the adjuster screws are all
the way out. When this happens I go back to square one and start over.
Usually that takes care of it, and I get the idle to around 800.
If you meant it won't idle below 1200 because it dies if you set the idle
lower, that may well be a symptom of poor spark. Or possibly too lean.
Does the distributor shaft rotate smoothly? Or is it loose or wobbly? I had
a bent shaft in my old distributor -- I could see how that might affect only
certain cylinders due to the rotor being out of plane with the cap.
on 8/16/01 10:42 AM, Anthony Woodruff at tonymmedia@yahoo.com wrote:
> Hello Listers,
>
> My car is running better than ever before! Great power, etc. when driving.
>
> Only problem is that I've got a "rolling idle" -- there is a periodic surge
> when the '66 B is idling (or any running below 1500 RPM). I checked my
> Bentley
> manual for diagnostic procedures and came up with very little.
>
> I checked my points and timing, and it occurred to me to put the timing light
> "clamp" on each of the other spark plug wires in turn - just to see when/if
> they were firing.
>
> 1 and 2 are very strong. Number 3 misses almost 1/2 of it's strobes, and
> number 4 misses only about 15% or so. This is at an idle of around 1000-1200
> RPM (the lowest I can get it at).
>
> Where do I go from here? I've replaced the distributor cap, rotor and spark
> plug wires. I have also checked the points gap and the timing - all are
> correct.
>
> Is my distributor faulty? Perhaps incorrect gapping of the spark plugs?
> Other
> ideas?
>
> I'm at a loss - your help, as always is appreciated.
>
> Safety Fast,
>
> Tony Woodruff
> '66 MGB
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.
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