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Autos - Cars > Big Block Ford Mercury > Re: 390 idle ti...
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Re: 390 idle timing

by "keng2" <keng2@[EMAIL PROTECTED] > Aug 13, 2007 at 08:48 PM

"Whole Lotta Tom" <Whathu@[EMAIL PROTECTED]
> wrote in message 
news:kA6wi.698$924.10@[EMAIL PROTECTED]
> keng2 wrote:
>> "Whole Lotta Tom" <Whathu@[EMAIL PROTECTED]
> wrote in message
>> news:narvi.13618$eY.924@[EMAIL PROTECTED]
>>>
>>> "keng2" <keng2@[EMAIL PROTECTED]
> wrote in message
>>> news:46bde3c2$0$29722$4c368faf@[EMAIL PROTECTED]
>>>> I recently replaced the dist. in my Mstng 390 which needed it so
>>>> badly that it wouldn't run  with the vacuum advance connected.The
>>>> cent adv springs were almost falling off and a $33 exchange dist at
>>>> the local Auto Zone was well
>>>> worth it.Now I seem to have a new problem.I set the idle timing for
>>>> 10deg BTC and the engine performs well but starts with extreme
>>>> difficulty.I tried a setting of 5 deg BTC and it starts great but
>>>> of course doesn't perform as well. Is there a happy medium or
>>>> should I be looking for vacuum leaks or? KenG
>>>>
>>>
>>> When you set the timing, do you have vacuum advance operating?  Are
>>> you using vacuum advance at all?  If so, where are you sourcing the
>>> vacuum?
>>>
>>>> There is a vacuun advance take off from the Holley to the dist
>>>> that uses venturi flow so there is essentially no vacuun advance(or
>>>> line vacuum) at idle even if the tube is connected. The advance
>>>> vacuum doesn't take effect until greater than 2000 RPM.So I,ve
>>>> decided to keep the 10 deg BTC setting and utilize the better
>>>> performance while checking for other vacuun leaks at the carb
>>>> base,intake manifold and vacuun operated power accessories.(pwr
>>>> brakes,xmission modulator,unknown smog equip)and what do you
>>>> suggest??
>> Thanks.
>> KenG
>
> When you have difficulties starting, does it kick back, or does it take
a
> lot of cranking before it fires?  Or is it something else?
>
It does just about "all of the above" and also runs rough and shakes for a

short time. It doesn't take alot of cranking and very little kick 
back.though. It generally smells rich but idles beautifully once it gets 
going.It does have a MANUAL choke though and I'm thinking that I just
never 
got the hang of starting with the manual choke??? Any comments
 




 6 Posts in Topic:
390 idle timing
"keng2" <ken  2007-08-11 09:28:45 
Re: 390 idle timing
"Whole Lotta Tom&quo  2007-08-11 22:58:27 
Re: 390 idle timing
"keng2" <ken  2007-08-13 07:10:14 
Re: 390 idle timing
"Whole Lotta Tom&quo  2007-08-13 17:23:55 
Re: 390 idle timing
"keng2" <ken  2007-08-13 20:48:45 
Re: 390 idle timing
"Whole Lotta Tom&quo  2007-08-16 17:37:10 

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tan12V112 Fri Oct 10 16:26:27 CDT 2008.