Re: IML: surging at highway speed

[sosmi@xxxxxxxxxxx]

Surging can be described several ways, gentle slow surges are usually fuel issues, (lean) sudden bumps, or cut-outs are more likely to be electrical, ignition, low voltage etc.Since the carbs of yesteryear, were jetted for better fuel, re-jetting or smaller metering rods are due.Low fuel pressure, restricted fuel filter, restiction in the tank pick-up, or possible air leak on the suction side of the fuel line are also possible causes. An ignition control unit usually gives, a go-no go kind of failure.One thing you could try, to verify a lean issue, try closing the choke valve half way, and road test again. This might richen the carb enough to reduce the symptoms.That might head you in the right direction.Since all carter carbs have the jets on the bottom of the float chamber, any trash in the carb will give problems.Ya'll have a nice day, Dave.

 

-------------- Original message --------------
From: "Robin Giesbrecht" <robings@xxxxxxxxxxx>

> Any ideas on a surging that is slight but getting worse at highway speeds on
> a 72 Imperial. I thought about a possible vacuum leak which I have to check
> out with a gauge but what about coil or electronic control unit? Any
> experience there? Everything else is great starts, idles, power you really
> can't say if there is any difference when you step on it.
>
> Robin Giesbrecht
> 1972 Imperial
>
> >From: "Rob van der Es"
> >Reply-To: mailing-list@xxxxxxxxxxxxxxxx
> >To:
> >Subject: Re: IML: iml 60 brake light switch/fuse?
> >Date: Fri, 6 Jul 2007 14:35:00 +0200
> >
> >Hmm.. that is a strange story St eve!
> >
> >I can't see how the temp gauge wiring interacts with the brake lights.Maybe
> >the 12 Volt power supply wire that is going to the voltage regulator inside
> >the temp gauge
> >has been shorted to ground?
> >In that case a fuse in the fusebox may have blown, and if the same circuit
> >that is protected by this fuse is also supplying the power for the brake
> >lights you problem might be solved.
> >
> >So my advise would be to check those fuses in the fusebox first!
> >
> > Good luck,
> >
> >Robert
> >
> >
> > Original Message -----
> > From: stephen dilley
> > To: mailing-list@xxxxxxxxxxxxxxxx
> > Sent: Friday, July 06, 2007 2:25 PM
> > Subject: IML: iml 60 brake light switch/fuse?
> >
> >
> >
> >
> >
> >
> > hi all, av a problem.. the other day a mate shorted the temp guage wires
> >and now i dont have any brake lights ? cant locate a specific fuse, can
> >anyone help ?? many thanks.
> >
> >
> > steve.
> >
> >
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