<VV> It Runs!! for a while...

[Cash Case]

It runs a drives smooth at speed and at idle. Accelerates without 
hesitation, until the engine warms ups.  Usually a few miles down the 
road.  then it starts to hesitate on acceleration and stumble a bit.  
Idle does feel a bit rougher.
My timing light took a dirt nap, so I'll need to get another. I have not 
checked the distributor plate and it's probably harder to spot without a 
timing light.

I'll check Mayy Nall's suggestion about choke position when warm to 
verify or eliminate that.
I assume that I should see identical throttle plate positions when the 
car is hot. Is that even doable?

As for Mike Kovacs and Dennis Pleau's suggestion, how do you check a 
coil, or is it just easier to replace it.  seems replacement is easiest 
to me.  ;op

I've replaced the tank sock so I'm good t here.  I've had that problem 
before. ;op

-Thanks
-C

On 7/21/2012 7:45 AM, Ken Pepke wrote:
> There seems to be some confusion concerning your meaning of 'runs fine' and 'warms up / nowhere near as smooth.'
>
> 'Runs fine' right after it is started and you are first driving down the road?  Or while it is on cold idle in your parking place?  Is the cold idle keeping the engine RPM high enough to make the engine appear to 'smooth' out?  Does your reference to 'nowhere near as smooth' mean engine vibration both at idle and running down the road?  Corvairs are known for having wear problems with the distributor advance plate.  Have you checked the timing with a timing light?  If the timing mark is anything less than steady the idle may be affected.
>
> Have you ruled out vacuum leaks ... particularly at the choke pull offs and the balance tube?  Secondary ignition wire leaks / distributor cap / rotor cap?  Tested the coil?  Has the cooling fan pressure blown off a spark plug wire?
>
> By 'nowhere near as smooth' do you mean it hesitates / stumbles / responds poorly to the throttle / misfires, vibrates as you are driving down the road?  Or any of these conditions standing still at an idle?  Is it most noticeable in first gear or third / fourth ... if there is a difference?  Does it feel like it is running out of gas?   Are you seeing black smoke [flooding] from the tailpipe?
>
> If it is still a problem after checking all these points it may be time to run a compression check.  Burned valves and / or holed pistons happen in an instant.  Either will most likely affect the 'smoothness' of the engine's performance.
>
> Ken P
> Wyandotte, MI
> Worry looks around; Sorry looks back, Faith looks up.
>
> ***************************
>
>
> On Jul 21, 2012, at 7:37 AM, Harry Yarnell wrote:
>
>> Clogged tank sock.
>>
>> -----Original Message-----
>> From: virtualvairs-bounces at corvair.org
>> [mailto:virtualvairs-bounces at corvair.org] On Behalf Of Matt Nall
>> Sent: Friday, July 20, 2012 10:14 PM
>> To: virtualvairs at corvair.org
>> Subject: Re:<VV>  It Runs!! for a while...
>>
>>
>>
>>
>> It's runs!  y '65 corsa started and runs fine... for a while.
>>
>> I've noticed this before.  I runs fine when it's cold, but once it warms up,
>> it's no where near as smooth.
>> Any ideas which direction I should look in? (yes, I ended that sentence
>> in a preposition.)   ;op
>>
>> I'm leaning in the direction of ignition parts.
>> -C
>>
>> ============================================================
>>
>>
>>
>>
>> CASH!!  Think about it...  What's the ONE big difference between Cold and
>> Hot on our Vairs???
>>
>>
>> The Choke position!!   You've got  carb /adjustment problems..... not
>> ignition!!
>>
>>
>> Matt Nall
>> Charleston, Oregon
>> http://tinyurl.com/The-Patio
>> http://tinyurl.com/Matts-Tech-Pages
>
>
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