[ROVERNET - UK] Mixture problems
vmitps at netspace.net.au
Sun Oct 14 22:42:17 BST 2007
It sounds like a needle (or two) are too low in the dashpot.
When using lift pins, only lift a leettle leettle beet... otherwise you will
set it too rich.
Why is it leaning out? At this stage I am beat; does pulling the choke out
work all the time from there on, or only for the first 30 sec?
If it is temporary then sounds like fuel starve, if ongoing then wrong
AAA or AAB for HS6 equipped TC.
Usually they suffer from leanness at idle due to butterfly shaft air leaks.
----- Original Message -----
From: "Nathan Obuch" <nathanobuch at yahoo.com>
To: <rovernet at lyris.ccdata.com>
Sent: Monday, October 15, 2007 5:27 AM
Subject: Re: [ROVERNET - UK] Mixture problems
> I don't know that I can claim to be a Rover 'guru'
> but off the top of my head, I think you are dealing
> with an unrelated issue... i.e. any properly
> functioning ignition system should not require any
> changes in the fuel mixture/carb needles/etc. A
> particularly strong spark can sometimes compensate a
> bit for a lean misfire, but is just masking the
> mixture issue.
> I would advise checking for any vacuum leaks you
> might have introduced during the installation of the
> Pertronix ignition. Check the float levels in the
> carbs. Did the car run OK prior to installation of the
> Are all the rest of the components in the
> ignition system up to snuff? Sometimes a higher
> voltage output from a 'hot' coil can break down weak
> plug wires/cap/rotor. I would also advise checking the
> strength of the spark just to be sure that you are
> getting a good spark and don't have a defective new
> Those are my thoughts-- I'm sure some real Rover gurus
> will weigh in with their ideas!
> --- Steven Dibdin <sdibdin at hotmail.com> wrote:
>> Hi Rover Gurus,
>> I've recently fitted a petronix ignition system to
>> my '68 2000 TC along with
>> their 'flamethrower' coil (god awful name by the
>> way). Timing is spot on, I
>> had to replace the old worn out advance weight
>> springs as they were weak
>> with age. I have checked the advance curve with a
>> strobe light and tacho
>> against the specs for my engine (10:1 compression)
>> and that is as it should.
>> My problem is that the fuel mixture seems to be off
>> now. If I set the carbs'
>> at idle using the workshop manual method of lifting
>> the pins and getting the
>> idle to rise then fall it runs a little rough at
>> idle, after a few minutes
>> of running the plugs get sooted up. Suggesting it's
>> too rich at idle. On the
>> road however, it runs far better than before, better
>> acceleration, more
>> responsive and a smoother delivery of power.
>> If I adjust the mixture at idle using my colourtune
>> the idle pretty smooth
>> but it is running too lean on the road, power's
>> lacking until I pull out the
>> choke to enrich the mixture.
>> So my questions are: Has anyone else found a similar
>> problem after changing
>> over to Petronix? Did they go for different needle
>> profiles to accommodate
>> the new system? Do I need to find a rolling road to
>> tune with new needles
>> Anybody out there have any suggestions?
>> Many thanks,
>> Steven Dibdin
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