Hi Oliver,
I have exactly the same problem when driving on a hot sunny day. This
was diagnosed as fuel evaporating from the carburetor float bowl that is
conveniently located directly above the exhaust manifold. The manifold
heats up the float bowl and more or less boils away the gas. Once you
start going again you have to get enough fresh gas through the float
bowl to cool it enough to stop the boiling. That is why it stutters and
runs poorly for a while.
When I start the car after parking it the first thing I do is to let the
fuel pump run until it stops ticking. This refills the empty float
bowl. Usually this lets me get the car started, especially if I pull
the choke out. The problem is that the car is running lean because of
the gas boiling, so pulling the choke out helps. I also find it is
necessary to run at well above idle, like in the range of 2000 rpm until
things settle down. I run the car with no load, sit and let it run,
until it is running normally, with the choke back in, and at normal
idle, as I worry that running it while it is stuttering because of
running lean could damage the engine if it is under load.
This works for me when it is sunny and in the mid to upper 80's, but
then again I am in upstate NY and not in the heat of Texas.
I am hoping that the ultimate solution will be a heat shield that Brown
and Gammons sells that protects the float bowl from the heat of the
manifold. It is their part number GAC1036 "Heatshield TC, TD, TF". I
got one, but have not gotten around to putting it in yet.
Hope this all helps
Roger in Poestenkill, NY
Roger G. Morse AIA
Morse Zehnter Associates
rgmorse@mzaconsulting.com
New York:
Rensselaer Technology Park
165 Jordan Road
Troy, NY 12180
(518) 283-7671
Fax: (518) 283-9855
Florida:
580 Village Blvd.
Suite 110
West Palm Beach, FL 33409
(561) 712-4777
Fax: (561) 712-4677
-----Original Message-----
From: mg-t-bounces@autox.team.net [mailto:mg-t-bounces@autox.team.net]
On Behalf Of oliver
Sent: Sunday, July 17, 2011 10:05 PM
To: MG-T
Subject: [Mg-t] trouble starting
greetings from Dallas, where on a good evening the temperature drops to
almost 80.
we were out in the car, about twilight. almost an hour later
weather.com says the ambient temperature is 90
we drove the car for about 10 - 15 minutes, then parked for about 10 -
15 minutes. it would not start, although it seemed to catch for maybe
one cycle or less.
fortunately, we were parked on a hill, and I was able to push start it.
it was very jerky for about 20 seconds, then ran just fine for the 15
minute drive home.
vapor lock?
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