<VV> Miscellaneous turbo fuel issues

Duane, Jim Jim.Duane at it.BAESystems.com
Thu Oct 20 14:32:12 EDT 2005

Odd things I've found to make driveability bad...

-air leak in fuel line
-air leak at intake coupler hose
-air leak at intake crossover to head
-Crankcase vacuum line (try blocking vacuum inlet)
-excessive fuel pressure/weak inlet valve (idle test)
-inadequate fuel return line (idle test)
-blown accel pump diaphram/bad check valve in diaphram 
-leak in float, sticking float
-break in boost guage/line (minor, though, if I remember.)
-break in pressure retard or line.

Changing carbs is a worthwhile test.

Idle test:  See if you can sustain a smooth idle for more than 5

I also wouldn't eliminate the electrical system if I were you...

Good luck.

Jim Duane
'66 180 Corsa CVT
Colonial Corvairs


-----Original Message-----
From: virtualvairs-bounces at corvair.org
[mailto:virtualvairs-bounces at corvair.org] On Behalf Of Norman C. Witte
Sent: Thursday, October 20, 2005 11:58 AM
To: virtualvairs at corvair.org
Subject: <VV> Miscellaneous turbo fuel issues

Well, I am still having issues with tuning on the '65 turbo.

I think the main problem is bad fuel and maybe a dirty tank, but I
thought I would toss this whole thing out there for comments.

The car has the following problems:

-Sudden loss of power and stalling with no ability to restart.

-Erratic/high idle.

-Rough running, missing.

-Run on after ignitition is shut off.

-Massive backfires if the tranny is used to kill the motor quickly after

Timing is set to 22 deg BTDC.  There is no pressure retard (waiting on
my safeguard), ignition consists of new mag wires, new plugs, new
Pertronix II and new high output coil.  Carb is a rebuilt unit from

Also, I drove the car on the freeway for the first time last night.  It
was rather cool but I still saw temps of about 425 on the temp gauge,
which is higher than I am used to on the red Corsa.

The carb does not seem to have any linkage issues, and I think I have
the choke adjusted properly.  I am considering pulling the rebuilt carb
off the car and putting the original one back on.  Right now I am having
the fuel lines purged and the tank cleaned.

I had the stalling problem last weekend.  I replaced the plastic filter
with a glass one.  There was some sediment and creap in the clear
plastic fuel filter but it didn't look plugged to me.

I did add some additive to the gas, but I think the most probable
culprit would be bad gas.  If I am thinking right, this would explain
the erratic performance (every time some water comes down the line, the
car wants to stall), the run on, the intermittent stalling.  Erratic and
sometimes fast idle?  I'm not sure on that one.  Backfires?  I suppose
that could be bad gas, if the stuff doesn't burn well enough in the
engine but cooks off in the hot exhaust.

I'm interested in your thoughts, suggestions.


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