[DeTomaso] NPC - Mustang Miss/Stumble problem

[Asa Jay Laughton]

Check all your vacuum lines for cracking or if any have fallen off.  Get 
your car to a place that can hook up a computer and give you diagnostic 
info.  On my ZX2, I never got a check engine light but my brother-in-law 
brought over his Ford computer, we hooked it up and found it was lean, 
like a vacuum leak.  A quick inspection found a hose disconnected under 
the intake (hard to find)  Things got much better.

It also may be your throttle position sensor has given out, maybe got 
some water inside, froze, cracked, works fine at higher throttle 
openings, but not at lower.  Just speculation.  Check the vacuum lines 
first.

Asa Jay


Asa Jay Laughton, MSgt, USAFR, Retired

& Shelley Marie
Spokane, WA

1971 Mach I Mustang  [ASA JAY]
1973 Pantera L 5533  [ASASCAT]
    
******************************     
http://www.asajay.com
http://www.teampanteraracing.com
  



Phil wrote:
> All,
>
>  
>
> Sorry for the NPC, but I got a sick Mustang in the garage and I thot I would
> tap the collective mind of the Pantera community to try to solve it :>)
>
>  
>
> Particulars are:
>
> 2001 Mustang GT, Automatic
>
> 4.6L V8 all stock
>
> 73000 miles
>
> No prior mechanical issues
>
>  
>
> Problem: It idles fine and runs on the road as normal until I try to
> accelerate gently as in normal traffic situations. It will then begin to
> stumble and miss (there is never any backfire). If I down shift it so that
> the engine goes to higher RPMs it will smooth out. Under wide open throttle
> it seems to pull strong and normal (although I thot I might have felt a bit
> of surging possibly once). With OverDrive "on" it stumbles under light
> acceleration and with OverDrive "off" it stumbles under light acceleration
> (but not as bad).
>
>  
>
> This problem occurred after several thousand trouble free miles driven
> during relatively warm weather. We had our first cold snap (down into the
> 20s) just a week or two ago and on the first night that the car was driven
> under these conditions this problem started. It had never done this before
> at all.
>
>  
>
> The Check Engine Light is NOT on. The first time this stumbling/missing
> occurred the CEL would flash a couple of times while the missing was
> occurring but then it would go out. There has not been any CEL flashing or
> staying on during any further start up and driving of the car, even during
> the stumbling/missing under light acceleration.
>
>  
>
> What I've done so far:
>
> 1 Changed fuel filter
>
> 2 Added Dry Gas treatment to fuel
>
> 3 Added Lucas Fuel Injection system cleaner to fuel
>
> 4 Visually checked all cables and connectors for obvious defects, poor
> connections, etc.. for Sparkpugs and Fuel injectors
>
> 5 Disconnected Battery for 15 minutes
>
>  
>
> Any insight would be greatly appreciated :>)
>
>  
>
> Phil
>
> #5924, 74L
>
>  
>
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