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Tech Manual
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Under Construction
Q & A: 74 BGT
Good day John,
I have gone through your sites question & answer pages, to try to find a
similar problem as I
have. I purchased this car one and a half years ago, I have most of the
cars documentation
right back to the order form to the dealer. The people picked the car up
in
England and
drove it in England for a few months, and had it shipped back to Rochester
New York. I
am only the second owner.
Now for the problem, the engine looses power, sometimes backfires through
the carbs (HIF's)
at 2400-2500 rpm. Any gear is the same, sometimes it will smooth out when
you accelerate
gently through this range, and sometimes not. Starts good, idles fine, but
runs bad through
this range.
Previous owner has removed all of the emission equipment, the carb.
butterflys are replaced
with the units without the springs (something that prevents run-on), looks
like the jets we replaced, as
were the needles, and the needles and seats...
I found what appears to be the original carb parts in a box of all of the
old parts. Added new stainless
exhaust system. Car sat stored for 4 years before I got it.
Compression is fine, except for #2 is about 10% low.
Replaced : points, condenser, rotor, fuel filter, alternator, coil,
fuses(all), vacuum lines(all),
had distributor and vac. advance unit checked on a machine, all of the
plug
wires are new.
Had one site show me how to 'by-pass' the ignition, made no difference in
running. Fuel
pump ran fine when we drained the old gas out of the tank. Spark plugs are
a brownish-grey
on all four.........
HELP ! I am beginning to think I may have some sticky valves ? Or the
carbs are goofed
up bad?
Thanks for your help,
Ken
Ken!
Four links in this chain: Emissions; engine; ignition; and fuel.
Emissions could be causing the problem if they're been disconnect
improperly: So, remove the vent lines from the carbs (the line that
read more
#152 1957 MGA Engine
It makes no difference how quickly your MG will accelerate if it cannot
stop! The proper functioning of your brakes must ALWAYS be at the
top of your list of priorities. You owe this degree of safety to yourself,
your passenger, and all others on the road.
John H. Twist (Fall, 1980)