<VV> Help - Convention Attendance at Risk!

Wed Jul 11 10:53:44 EDT 2012

Sounds like a fuel delivery problem made worse by heat. No accereration at 
operating temp. Is there a good healthy squirt of fuel from the accelerator 
pump discharge.

What I do to locate a low fuel pressure and volume (pluged in tank fuel 
strainer) is to have the car at operating temp. Five minutes. Then 
disconnect the fuel delivery line to a carb, put a hose on it andcarefully 
( we don't want a fire ) have some one start the engine and watch the fuel 
squirt into a container. If you get a few squirts aten it dribbles then you 
know that the problem is in the fuel system. If you get dribbles then to 
find the exact problem isolate each connection to find the problem. I 
reconnect the fuel system, run for a minute to refill the carbs, then 
resetup the fuel discharge into a container and then hook a hose in a fuel 
can to the inlet of the fuel pump. recheck for the squirts and dribbles. If 
every thing is now OK then the pump is fine. I then redo this test procedure 
for every connection. The point of change and the last point has a problem. 
If every thing is OK at the gas tank connection then the problem is in the 
tank usually the fuel sock. This has worked for me lots of times. GM 
products were the worst with the sock in the tank but all makes had this 
problem to a lesser extent. If this is not clear ask questions and I will 
attempt to make it clearer.

----- Original Message ----- 
From: "Ken Pepke" <kenpepke at juno.com>
To: "Jeffrey B. Aronson" <jrh at foxislands.net>
Cc: "Virtual Vairs" <virtualvairs at corvair.org>
Sent: Wednesday, July 11, 2012 7:42 AM
Subject: Re: <VV> Help - Convention Attendance at Risk!

>
> How frustrating!  You sure have touched everything!  I have experienced a 
> very similar situation and, although it tested well, the coil was the 
> problem.  Perhaps you should take a moment to be sure the coil is not 
> installed backwards.  And, if you can, swap a coil from a known to be 
> running well engine for a test.  Hope you have good luck with this.
>
> Ken P
> Wyandotte, MI
> Worry looks around; Sorry looks back, Faith looks up.
>
> *****************************
>
> On Jul 11, 2012, at 7:55 AM, Jeffrey B. Aronson wrote:
>
>> Sorry in advance for this long email, also a post on the Corvair
>> Center/Corvair Forum!
>>
>> I'm having a long stretch of continued running problems with my '66
>> Monza 110/4; now it's making my attendance at the Convention 
>> questionable.
>>
>> The core symptoms are that the car will start and run quite well for
>> approximately 15 minutes - nice idle, smooth acceleration, good power -
>> and then cease to accelerate. Pressing the throttle to the floor will
>> result in a tremendous "bogging."
>>
>> The only way to pick up and hold speed is to feather the accelerator to
>> slowly build speed. The car doesn't just slow down, it wants to die off
>> the side of the road. Unless the car sits for a few hours it will not
>> run well again. It will tootle about town fine - it only manifests
>> itself when it's under load at speed. When it has died, it will sputter
>> to a stop. Then it will start again. A mechanic on the roadside has seen
>> the carbs shoot gas when punching the accelerator - so have I.
>>
>> The car has 129,000 miles on it. I've had the car since 2007 and have
>> put about 15,000 miles on it since its purchase. It did not exhibit
>> these symptoms until the past year.
>>
>> A leak-down test yesterday revealed no cylinder blowby in any cylinder.
>> All the plugs looked the same - dry and a bit black from running around
>> town too often - both to me and more experienced Corvair enthusiasts
>> [thank you Dirigo Corvairs].
>>
>> I've tried to tackle this in sequence to diagnose the problem
>> effectively, to determine whether the problem is fuel or spark, or some
>> combination of the two. Here's what's been replaced [so far to no avail]:
>>
>> -New spark plug/coil wire set [Clarks]
>> -New coil [Clarks]
>> -Rebuilt distributor [Clarks]
>> -New points, cap, rotor, condenser (replaced twice) [Clarks]
>> -New engine wiring harness [Clarks]
>> -Rebuilt carbs [Clarks]
>> -New fuel lines from sending unit to carbs
>> -New filter sock
>> -In line fuel filter
>> -New fuel lines in engine compartment
>> -Replaced Facet electric fuel pump twice, then removed the pump 
>> altogether
>> -Replaced mechanical fuel pump twice, now running only on mechanical pump
>> -Gas tank drained examined with scope and pronounced clean
>> -Filter stones completely clean
>> -Carbs balanced and synchronized by an experienced tuner and confirmed
>> by a Unisyn.
>> -Exhaust "doors" open when the car is warmed up
>> -Placing my hand over each carb throat when running results in the same
>> drop in rpm.
>> -Running the car at speed without a gas cap does not change the running
>> problems.
>> -Balance tubes, vacuum hose and PCV pipe are fine and the PCV pipe has a
>> tiny orifice at the vacuum hose end. It runs the same with and without
>> that orifice.
>>
>> Since the car starts and fires I can confirm that I have spark, low
>> tension and high tension. On the side of the road the car will restart.
>> Cracking a fuel line at the carb shows that I do have fuel pressure in
>> the lines.
>>
>> The coil is in the stock location and has been there since I purchased
>> the car. The coil's been replaced twice with no change in running
>> condition. The coil was hot to the touch yesterday when I experienced
>> the problem again - but it's always been hot after running. When last
>> tested it had the correct voltage when running.
>>
>> The car does run around town without these symptoms - the problems seem
>> to be when the car is running warm [> 10 minutes] and under highway
>> speed load.
>>
>> The car needs to earn its keep as a work vehicle [4 hours of driving
>> once a week] and I want to keep my reservation and registration at the
>> Convention. Has anyone else experienced this problem and discovered a
>> solution not on my list?
>>
>> Thanks for your advice,
>>
>> Jeff Aronson
>> Vinalhaven, ME 04863
>> www.landroverwriter.com
>
>
>
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