DeTomaso Mailing List: June 2000, Message #87

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Date: Sat, 03 Jun 2000 13:57:22 -0700
From: Al Chelini <chelini@earthlink.net>
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To: Phil Perry <pvperry@ix.netcom.com>
Subject: Re: Stumble
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Phil, If the car doesn't produce a lot of black smoke when the stumbling
is going on, then it is suffering from a lean condition under
acceleration. Backfires are a classic indication for this.
  If the car will eventually achieve a high speed and then run without
problems, you can probably rule out a bad fuel pump/ filter, as then the
fuel delivery is OK.
  Lacking this, it sounds like the accelerator pump diaphram is leaking
and not pumping. A rebuild /kit is in order.
 BTW, I appreciated your comments on the Corvette seats; I'm looking for
something which supports better, and these sound like the way to go. 
Al, #3915.


Phil Perry wrote:
> 
> All,
> 
> I need your collective opinions as to the cause of the following;
> 
> If when starting out from a stop in the Pantera, I open the throttle
> progressively and fully, it accelerates normally with only a hint of
> stumble (hesitation) at higher RPMs. However, if I open the throttle
> aggressively it will stumble badly and sometimes backfire thru the
> exhaust. This happens when the car is fully warmed up. When it is cold
> it doesn't seem to do this. Of course I'm not accelerating aggressively
> when it's cold either.
> 
> The car is a 74 L with the stock 4300 Autolite carb.
> 
> Is this an accelerator pump, temporary over lean condition? or a weak
> fuel pump? or what? Fuel lines are new and clean as well as the filter.
> 
> Once the stumbling subsides the engine pulls like a train thru all the
> other gears with no hint of stumble.
> 
> What thinkest thou? or would that be thouse??
> 
> Phil (just stumblin around) Perry #5924


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