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My B runs ruff when first starting

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My B runs ruff when first starting #1
Willtree William Trieloff Brownsburg, IN, USA Sign in to contact	Topic Creator (OP) Jul 29, 2014 04:23 PM Joined 10 years ago 13 Posts

When first starting my 78 mgb it runs very ruff, like it's running on 2 cylinders. Then after driving for about 4-5 miles than suddenly the power picks up runs smoothly. I have changed the plugs(E3),wires (denso), but this has not cured the problem. Any suggestion
Bill

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Re: My B runs ruff when first starting #2
ingoldsb Terry Ingoldsby Calgary, AB, Canada Sign in to contact 1971 MG MGB	Jul 29, 2014 05:01 PM Top Contributor Joined 20 years ago 20,139 Posts

What carbs do you have?

Terry Ingoldsby
terry.ingoldsby@DCExperts.com

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Re: My B runs ruff when first starting #3
Bluvair Dwight Anderson Quakertown, PA, USA Sign in to contact	Jul 29, 2014 08:36 PM Joined 14 years ago 263 Posts

I would shut it down and look at the plugs when it is misfiring. Not running of course. I would want to see if your plugs are wet or dry and it is mainly one carb or if it is both.
Dwight Anderson

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Re: My B runs ruff when first starting #4
lewisrn Bob L Danville, IN, USA Sign in to contact 1980 MG MGB "The "B"	Jul 29, 2014 09:02 PM Top Contributor Joined 13 years ago 13,191 Posts

If you have the Zenith-Stromberg carburetor, the problem you describe could be attributed to the water choke, which could be inoperative for some reason. They are known for not working well.

“Ideological certainty easily degenerates into an insistence upon ignorance". Daniel Patrick Moynihan

In any debate, the side which strays from civil discussion is usually the side that lacks confidence in its debate position or in the merit of their arguments. Making personal attacks on the opponents instead of staying on the subject is also a sign of weakness.

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Re: My B runs ruff when first starting #5
mac townsend Fairfield, CA, USA Sign in to contact 1973 MG MGB MkIII	Jul 29, 2014 09:10 PM Top Contributor Joined 18 years ago 24,294 Posts

do you know how to use the manual choke? Most drivers under age 40-50 or so do not. Many have never heard of such.

1973 Pale Primrose Roadster. A nice 10-footer!
SUs, Datsun 5-speed

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Re: My B runs ruff when first starting #6
DrewM Drew Maddock 74 MGB roadster, Southern California, USA Sign in to contact	Jul 30, 2014 12:58 AM Top Contributor Joined 18 years ago 8,133 Posts

If you do know about pulling out the manual choke for the first mile or so, check to be sure the choke is actually operating, the cable is not too loose, etc. If the choke isn't used or isn't working, you would get these symptoms until the car had warmed up. Alternately you could just warm it up in the garage for a few minutes, then drive off.

Drew Maddock, So. Calif. USofA

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