Blake, Taking the easiest thing first, it sounds like a carb problem to me.
If your front carb is getting no fuel, choking would not tell you anything
anyway. I suggest you open the front carb float bowl and see if there's
any fuel in it. If not check the needle valve or grose jet it could be
stuck, anyway you can trace the blockage backwards from there. If there is
fuel in the bowl, then you could have a blockage between the bowl and the
jet (pretty unlikely). The more disturbing possibility would be a blown
head gasket. First check compression because you could have a blown head
gasket betweeen # 1 and #2 which could have the same symptoms you describe.
Two cylinders misbehaving side by side suffering from the same problem
limit the possibilities to things that they both rely on. Good luck
TTFN
TCSYD
----------
> From: Craig H. Brallier <brallier@twd.net>
> To: Blake Wylie <bwylie@hiwaay.net>
> Cc: mgs@autox.team.net
> Subject: Re: Same problem but different...Re: Electrical Question
> Date: Tuesday, October 07, 1997 10:34 AM
>
> Blake Wylie wrote:
> >
> > Hello everyone,
> >
> > I've been having a problem with my new B (1970 w/1974 motor/twin carb).
It
> > seems that the front two cylinders don't want to work...the effect is a
> > jumping, missing motor. It'll run, but it really doen't have the power
that
> > it is supposed to, and it keeps missing. Now...My first thought was to
> > replace the sparkplugs, and I did. I also checked the points, and they
were
> > new. It didn't get better. I then looked for new sparkplug wires, but
no
> > one had any. I ordered them yesterday and picked them up this morning.
> > However, yesterday, I went ahead and replaced the distributer cap along
with
> > the rotor within the distributer. No difference. I also checked to
make
> > sure the wires were in the correct firing order, and they were. We
moved
> > the timing, and only a slight difference could be noticed. This
morning I
> > finally got to replacing the wires, but there was still no difference.
What
> > next? The carbeurator...so far I have partially ruled this out...1)
the
> > plugs have had gas on them...2)while going down the road, I pulled the
> > choke, and there was no difference at all (thinking along the lines
that if
> > one of the carbs was thirsting for fuel, the extra boost would help).
> > Now...as was related in Re: Electrical Question, I had already pulled
the
> > front two plugs, and it didn't make any difference. Switched them
> > around...no difference. The second two do make it worse when you take
them
> > off however.
> >
> > What else is there to look at? Could it still be the front carb?
Could a
> > valve be stuck somewhere? Is there something I missed in the
electrical system?
> >
> > Anyway...any and all help will be most appreciated. :)
> >
> > Thanks,
> >
> > Blake Wylie
> > '70 MGB
>
> Blake,
> Some of the listers have pointed to a valve problem. I agree. This is a
> long shot because you have 2 dead cylinders but my 75 B had a miss when I
> bought it. I replaced everything electrical, points, plugs, rotor,
> distributor cap and plug wires but no difference. Then I did a
> compression test and found #2 cylinder had no compression. Figuring the
> worst, I planned to pull the head when my local MG mechanic said to check
> the valve clearances. Found one of the valves, besides not having any
> clearance, was adjusted so that it held the valve open all the time. Good
> luck.
>
> Craig
> 75 B now running on 4 instead of 3 cylinders
> 76 B
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