[NOBBC] Any thoughts on a starting issue?

[Robin Jackson]

The HIF-4 Carb(74 MGB) Has throttle shaft seals that wear and cause
uncertain starting. SU carb needles and jets wear over time and may cause a
rich condition, especially on choke starting. Periodic rebuilds are
necessary- or replacement. What carbs are on the 59 AC? Replacement
Webers are not as challanging as the SU constant velocity carbs.

Rj

On Mon, Jul 2, 2012 at 3:16 PM, Andy Preston <andypreston at sbcglobal.net>wrote:

> Greg, I have the same problem with my 74 MGB GT sometimes and have tried
> most things.  First of all do a compression check to rule out a leaking
> cylinder head gasket.  Do it cold and hot.  I replaced all ignition system
> on my car and it didn't make any difference.  Check the plugs in the
> morning
> prior to starting the car; I normally had one of two clean ones and two
> that
> were either damp or wet.  If I installed clean plugs it fired up
> immediately
> on all four cylinders.  So I assumed it must be fuel related.  I cleaned
> and
> aired out the charcoal canister and that seemed to help some.  I've
> adjusted
> the carbs and am probably running a little lean.  When I start the car I
> usually spin the engine with no choke at first and then just a little choke
> and then it starts.  So far I'm learning to live with it but haven't really
> found the answer.  If you discover the silver bullet let us know.
>
> BTW I have 3 other MGs and they all start with no problems; maybe its smog
> related.
>
> Andy
>
> -----Original Message-----
> From: nobbc-bounces at autox.team.net [mailto:nobbc-bounces at autox.team.net]
> On
> Behalf Of Greg Badano
> Sent: Sunday, July 01, 2012 7:08 PM
> To: North Bay British Car Club; NOBBC at yahoogroups.com
> Subject: [NOBBC] Any thoughts on a starting issue?
>
> Hello all,
>
> I am hoping I can get some possible trouble shooting
> suggestions for diagnosing a starting issue that has recently developed
> with
> my car.  It starts up almost immediately but it's not firing on all
> cylinders.  It will lope along for a few minutes this way and then I can
> hear
> and feel the missing cylinder(s?) start to kick in here and there until it
> finally all six are firing the way they should and it idles smoothly at 500
> RPM.  Revs and drives just fine after this initial rough period as well.
>  It
> does this consistently if it has been sitting a while.  I pulled all the
> plugs, cleaned and re-gapped them thinking perhaps one was fouled.  For
> what
> it is worth they were all pretty dark.  Maybe this is related and maybe
> not.
>
> Any thoughts on what might be going or how I might isolate the problem?
>
> Thanks in advance for any thoughts and suggestions.
>
> Greg
> 1959 AC Aceca
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