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TR6 Engine Still Stalls

To: "6pack" <6pack@autox.team.net>
Subject: TR6 Engine Still Stalls
From: "Steven Altomare" <gtg124h@mail.gatech.edu>
Date: Sun, 19 Feb 2006 03:05:14 -0500
Hi all,

As some may recall, about 5 weeks or so ago I came to the list asking for 
help with my engine which stalls after highway runs.

As I've been quite busy, I haven't been able to work on it until today, 
where I cleaned, adjusted, and replaced the 2 seals for the temperature 
compensators on the carbs.  Of the 4 total seals, one was missing, 2 were in 
terrible shape, and the last was in OK shape.  The compensators were sticky 
and very hard to move.  I cleaned them and using a pot of water with a 
thermometer, adjusted them to open around 150 degrees F as suggested to me 
by others.

The engine still does not keep running however.  I think the problem is 
related to ambient temperature as the problem seems worse at colder temps. 
I just drove the car tonight.  A bank I passed had 28 degrees F as the 
temperature.  The car was an absolute bear to drive - it was hard if not 
impossible to keep it running.  After the run tonight I don't think the 
issue is stalling after highway runs, but more of stalling in cold weather 
as it stalled at every stop.

This is a listing of everything I've done since October when the problem 
started:

Checked ignition timing
checked spark plug wires
replaced spark plugs
checked distributor cap and shutter (we run a Mallory)
Checked for vacuum leaks - found a few and fixed them
replaced fuel filters
replaced fuel pump
replaced carb diaphragms
added hose clamps to every hose in the vacuum system to eliminate leaks in 
those places
checked mixture - looks good
replaced 20W-50 oil in the dashpots with 10W-30
repair and refit of temperature compensators

Just to note, a few have suggested that maybe the fuel tank is not venting 
correctly.  Tonight I drove a portion of my trip with the gas cap open and 
it made no difference.

I have 2 other issues which may or may not be related.  First is bad gas 
mileage.  I'm only getting around 16 mpg and most of my driving is highway 
miles.  2nd is sometimes the car "hiccups" while I'm driving.  I hear kind 
of a puff sound from the engine, the car kind of jerks real fast, and I can 
audibly hear the engine drop in rpm for just a split second.  This sometimes 
happens, sometimes it doesn't.  Again, as with the engine stalling, this 
happens more when the ambient air temps are cold.

At this point I am asking for any and EVERY suggestion, as wild or as dumb 
as it may sound to you, it may be my solution.  I have been fighting with 
this since October and more and more the idea of getting rid of these 
Strombergs is looking like a better idea.  These carbs have treated me well 
for 6 years but these past 5 months have shown me why some people like to 
switch to other carb set-ups.

Thanks for any suggestions (and reading this long message if you made it 
this far)!

Steven Altomare
1974.5 




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