I think a stuck head riser would certainly affect how the car runs when hot,
but my main reason for suggesting it was the difference in exhaust pipe
temperature between the two sides of the car. The gasket that would affect
only one side of the car would have to be the intake manifold gasket - as a
leak at the carburetor base would affect both sides of the car. Another
item that would affect mostly one side of the engine would be a serious leak
into the intake manifold from the large vacuum fitting that supplies the
brake booster etc. This would certainly give a very low reading on your
vacuum gauge, however.
Since your car already has the 5 speaker setup, you can easily splice into
the individual speaker leads and drive them from the 4 speaker lines out of
your modern device. The only problem is that the car's speakers share a
common ground return from some of the speakers (I think the front 3) and
this is incompatible with most transistorized modern electronic devices,
they require floating grounds, and if you were to connect to the existing
harness, you would damage the new equipment. You'll need to investigate the
requirements of the device you want to install, and try to find one that
tolerates common ground returns. The other way to accomplish this is to
rewire the car's speakers so that each speaker has two independent wires,
and such that none of them are connected together or grounded to the car.
Then you can hook them up to your new radio and it will work just fine. I'd
not try to incorporate the front center speaker, just use the 4 in the doors
and rear shelf. If you are planning to run your sound system really loud,
you will probably find the original speakers can't take it, though. Back in
the 60's, anything over 100 dB was considered torture (and I agree!).
Dick Benjamin
----- Original Message -----
From: D. Dardalis <dardal@xxxxxxxxxxxxxxx>
To: <mailing-list@xxxxxxxxxxxxxxxx>
Sent: Saturday, July 06, 2002 9:34 PM
Subject: Re: IML: 68, bad idle+multiplex stereo
> At 08:43 PM 7/6/2002 -0700, you wrote:
> >Your problem is more likely a vacuum leak at your intake
> >gasket, or a plugged heat riser valve.
>
> Dick, wouldn't a plugged heat riser valve make the car run poorly when
> warm? The car runs pretty strong, especially at WOT. Also, the poor idle
> occurs even when cold (actually, its even worst then). If you agree, then
> it must be the gasket. I can do the WD-40 test, but if the leak is in the
> lower gasket, that wouldn't show right? Can I just try to tighten the
> manifold bolts?
>
> Also, I was looking at the imperial site where you describe the multiplex
> stereo and tape deck installation on your 68. The LeBaron has the
> multiplex stereo radio (which does a very good job, almost as good as you
> describe) but I do not have the tape deck. I was curious, is there an
> "easy" way one can plug a modern CD player or walkman to these old radios?
> D^2
>
>
>
Back to the Home of the Forward Look Network