1) It sounds like the speedo cable is binding causing it to windup and
release. My speedo started jumping at about a 15 MPH bounce. Replacing the
cable fixed it the first time but when it came back a few months later I
discovered that the speedo was messed up. the gears inside had gotten chewed
up. They can be fixed though. Try replacing the cable and make sure that
there are no kinks or tight curves in it.
2)Your cat might be getting clogged. Of course they are supposed to be hot
but if your car had been burning oil or running rich you could have buildup
on the inside causing back pressure. How does your car run? Do you have loss
of power at high RPMs? Just an aside... My friend put a new manifold and
Holley carb on his 78 Monte Carlo a few years back. He set the mixture
himself. About two weeks later he awoke one morning to find that his car had
burnt up. The cat melted through the floor and started a fire which made the
inside very crispy. Many people with late model Bs convert to Webers which
require a new header eliminating the cat. You would be removing required
emissions equipment though, and in most states that a no no. So legally, you
can't do that but most people do. If you live in CA or some other emissions
control state I would check first before rendering my car unregisterable.
Chris Reichle
----------
From: mgs-owner
To: mgs
Subject: 1st Time MGB Owner
Date: Tuesday,August 06,1996 11:55PM
>>
>I recently purchased my 1st MGB - a 1978. It needed some work and most was
not that bad - new clutch assm, front rotors and pads, and some minor
things. What I now face is a little more tricky and I definately need some
help.
1) The speedometer started jumping up and down from about 10MPH to 45 or 50
MPH. I figured it was the cable that broke. I pulled the cable and its
not broken. I checked the top when traveling down the road and it does
not turn so its something by the transmission which is the problem. Any
suggestions where to check next?
2) There is alot of heat reflected off the catalatic converter. It has
melted a three way vacuum hose connector near by twice. Any ideas why
this is so hot? Is there an exhaust system made which eliminates the
convertor or can't I do that?
The car is great when running but right now its just HOT in the wrong ways.
>
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