[Mgs] Bad Fuel Question

[Simon Matthews]

Condencers can fail in two ways, open and closed. If they fail closed
(shorted), you are not going anywhere, but if they fail open (infinite
capacitance), much of the energy in the spark can be lost through arcing
across the points, leading to rough running.

Simon

On Tue, Jul 23, 2019, 9:03 AM Max Heim via Mgs <mgs at autox.team.net> wrote:

> I understand how it could make the car inoperable. I don’t see an
> explanation for an intermediate state.
>
> --
> Max Heim
> mvheim at sonic.net
>
>
>
> On Jul 23, 2019, at 6:53 AM, Charley Robinson <Charley38 at twc.com> wrote:
>
> Not true, Max.  When the points open, the condenser discharges through the
> coil in order to perpetuate the spark.  Without the condenser the engine
> may not even start.  Try it some time. :-)
>
> CR
>
> On 7/22/2019 1:18 PM, Max Heim via Mgs wrote:
>
> How do bad condensers cause rough running? All they do is prevent the
> points from burning. Oh, you are saying the points are burnt.
>
> --
> Max Heim
> '66 MGB
>
>
>
> On Jul 22, 2019, at 11:10 AM, i erbs via Mgs <mgs at autox.team.net> wrote:
>
> could also be a bad a condenser. Could coincidental, not causational. How
> old is the condenser? Even if newish, there are lots of crappy new Lucas
> parts out there. I had three bad ones with similar results, until replaced
> with  a Distributor Doctor HD condenser.
> Ira Erbs
> Portland,OR
>       _______                                  _______
>      (______ \____1959 BN4____/ _______)
>          (_________________________)
>           BT7 engine and disk brakes
>
>
> 1967 MGB  [image: MG]
>
> A racing car is an animal with a thousand adjustments. Mario Andretti
> Please excuse random auto corrects and misspelled words
>
>
> On Mon, Jul 22, 2019 at 10:36 AM David Breneman via Mgs <
> mgs at autox.team.net> wrote:
>
>> I've never encountered a "bad fuel" problem before, so I'm looking
>> for some confirmation (or not).  The local Mom-without-Pop store put
>> in new pumps, and one of the things they're offering now is 92 octane (US)
>> alcohol-free gas.  I had about a quarter tank in my MGA (w/MGB high
>> compression engine) so I went to fill up.  The pump with the alcohol-
>> free gas was out of order!  So I put in three gallons of regular 92
>> octane, and about 1/4 mile from the station started experiencing a lot
>> of misfiring, mostly when accelerating in 3rd and 4th.  I continued
>> driving like this for about 20 miles to see if it would clear up and it
>> never did.  I can't imagine it's anything but the fuel, but I've never
>> encountered "bad fuel" situation like this in 44 years of driving.
>>
>> The fact that it started about 1/4 mile after leaving the station seems
>> like pretty good evidence.  Any other possibilities?  Is there any option
>> other than to just burn through this half tank of gas?
>>
>> Thanks!
>>
>> David Breneman  david_breneman at yahoo.com
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>>
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