Moss Motors, Ltd

My  1977 B has an occasional, momentary loss of power/hesitation.  It happens when I am cruising at anywhere from 45MPH up.  Not when I'm accelerating, just when I'm running at a steady spead.  When I say momentary I'm talking 1/2 a second to 1 1/2 seconds.  It seems like there is a brief bit of a lack of fuel.

 I've recently rebuilt the Zenith Stromburg carb, but I seem to remember it doing this last summer before I rebuilt the carb also.  The gas in my tank if about 1/2 6 months old and 1/2 brand new.

 Does anyone have any suggestions on this? 

 Thanks,

Derrick

 

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1977 MGB - My First Car, purchased in 1987

Interesting, such a momentary cut at steady speed would have me looking at the ignition.

Last year, I had a faulty coil - there was a bad contact on the 12v circuit inside the can, and this produced a similar hesitation. Check all the connections from the supply throught the system, also the earthing wire inside the distributor (if you are still using points ignition). It sounds like it could be a faulty connection somewhere.

 Ed

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I want my MGB

Good call Ed...

It could also be a sticky valve. I've been there!

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On their death bed, nobody ever said, "Gee I wish I'd spent more time at work!"

'68 Sprite 1275
'76 Midget 1500

How would I check for a sticky valve?  And is a sticking valave something I can live with for a while?  My MG gets pretty limited use, maybe 200 miles a month.  My wife is 8 1/2 months pregnant so my toy budget has be reallocated to our baby toy budget...

I'll start with the electrical side of things, I have had to recently clean several coroded connections that were giving me electrical probs so hopefully that will take care of things!

 

Thanks for the suggestions, I'll post back with the (hopefully successful) outcome.

Derrick

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1977 MGB - My First Car, purchased in 1987

Runs good under acceleration but some skipping under light load? I'd also check the timing, particularly the vaccum unit. It wouldn't hurt to check the fuel mixture and float levels too.

 

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Bayless
Never express yourself more clearly than you can think
'48 Prefect
'67 Sprite (project)

It is very intermitant.  It might happen once or twice in a 15 min. long drive.  The float and mixture shold be good.  You never know if I might have messed up the carb rebuild though....

 

 

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1977 MGB - My First Car, purchased in 1987

The vacuum gauge is a good diagnostic tool for checking for a stuck valve among other things.

http://www.secondchancegarage.com/public/186.cfm

Another thing that gets overlooked is the fuse panel. Glass fuses can look good and go bad at the base to filament connection. A cheap fix, pull the fuses clean the holder conections tighten the "clips, and install new fuses. You never know it could be that simple good luck