Wayne:
The fuel pump is stock, and I checked it last year when I had a fuel
starvation problem, so I think it's ok. I know at least one of the advance
mechanisms is working (mechanical or vacuum) since I can see the spark
advance on the timing light when I rev it, but I think I'll test them
independently to be sure. There is no "pop" at idle; only during
acceleration and deceleration.
Bill Vander Werf suggests checking to make sure #5 and #7 wires are not
close to each other since they can easily cross-fire. This was also
suggested by a buddy of mine, so I'll definitely look into that.
One thing I noticed about the 1405 vs the 1406. The 1405 is set up much
richer than the 1406, even though they are basically the same carb.
Thanks everyone for the suggestions.
Tom
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Wayne
Sent: Tuesday, June 03, 2003 7:27 AM
To: [EMAIL PROTECTED]
Subject: Re: [Chevelle-List] Rich Edelbrock Carb
Tom.. The 1405 carb.. is close for a mild 350 out of the Box...With the O2
sensor ( COOL )
I assume you have a mechanical full pump... if that is the case and it's a
Hi out put. you can
over power the needles in the AFB/Edelbrock type carbs. They only like 6 t
o7 psi ..
. At a idle is the a " POP" in the header ??
Another problem I have run into in NEW installations.. is dirt- sediment
getting in to the metering fuel deliver circuit ...
Cross fire on New Wires !!! can, but most likely NOT...
I would double check my firing order..timing and Points,, the obvious
spring and mech advance on the Distributor .. then start on the full
delivery sys.. then the carb,,
The Carb came with a tuning chart,, also there web page has good info...
GL Wayne
ACES # 1556
TCG # 186
----- Original Message -----
From: "Tom Tomlinson" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, June 02, 2003 8:21 PM
Subject: [Chevelle-List] Rich Edelbrock Carb
> Last week I started up my 350 Malibu after installation of a new Edelbrock
> 2701 intake manifold, 1405 carb, Sanderson headers. The good news is,
there
> are no external leaks of water, oil, or exhaust. The bad news is, after
> adjusting dwell and timing, I find the car "pops" in the header when
> accelerating and decelerating. I installed an O2 sensor to help with
tuning,
> and it's telling me the mixture is rich (O2 sensor reading > 900mv), so I
> suspect extra gas is igniting in the header. I'm disappointed because the
> intake/carb combo are supposed to be "matched" and run "right out of the
> box". The engine has stock heads and ignition, and a modified cam of
unknown
> spec (the previous owner said "it was a 350 HP cam with nothing above 5k
> rpm").
>
> - Has anyone else noticed an overly rich 1405 upon initial installation?
> - can the cam have a dramatic effect on A/F mixture?
> - is there an easy way to check for ignition cross-fire (I made new plug
> wires and they could be part of the problem).
>
> Tom Tomlinson
> '71 Malibu
>
>
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