Forwarded from Wally to MG List.
Jed
San Antonio, TX
----------
> From: Wally Teto <monadnoc@wgserv.crystal-mtn.com>
> To: JedPiper <JedPiper@earthlink.net>
> Subject: Re: Backfire
> Date: Monday, August 18, 1997 7:58 PM
>
> JedPiper wrote:
> >
> > Wally -
> >
> > A few hundred RPM isn't significant enough to indicate a problem with
the
> > advance however, I would still swap distributors with your donor as a
> > diagnostic step.
> > If you do try advancing the timimg as Mike suggests (old distributor
> > installed), and you find that the engine smooths out at around 23
degrees,
> > I would still look to the advance unit as the source of the problem.
It
> > may not be completely malfunctioning, but it's probably on it's way
out.
> >
> > Jed
>
> Thanks again for all the help Jed. I may have inadvertently stumbled
> across the problem. I was concerned about the fact that the fuel pump
> kept sounding like it was trying to fill the system without success. I
> disconnected the line at the carb input and found it to be not sending
> fuel at a steady stream, but pulsing, first nothing then a charge of
> gas.
> I ended up removing the 2 filters that the PO had installed (one back
> near the tank, one in the engine), blew out all the lines and
> re-installed without filters. Now the pump loads the lines and float
> bowls and then quiets down like it should. I started the car and there
> seems to be a great improvement. Now I have to get the jets back to a
> reasonable setting. I guess with this "semi-starvation" fuel situation,
> it really was acting like the carbs were leaned out. I put in a new set
> of plugs for good measure as well. I am going to leave the distributor
> set at 15 degrees static advance and see how things run (one thing at a
> time!). I did pull the other unit out of my donor car and have it on
> the bench just in case.
>
> Tomorrow I need to run the car down to the inspection station to get it
> to pass. It failed the first time last Friday because of loose kinpin
> and front suspension bushings. Spent the weekend swapping front ends,
> so I hope that clears that up as well. Will keep the list posted to new
> developments. Thanks again and I sure am glad for all the handy input
> on this list. Really saves time trying to run down a problem on your
> own. Some of us are not "ace mechanics"!!
>
> Gratefully, Wally in Templeton, MA
> 71 MGB, medical condition greatly improved (for now).
>
>
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