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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