[DeTomaso] NPC - Mustang Miss/Stumble problem

[Doug Braun]

Except a 2001 Mustang doesn't have a MAP (manifold absolute pressure) sensor.  It uses a MAF (mass airflow sensor) instead.

Doug Braun
blue 73L #5505

----- Original Message -----
From: Erik L [mailto:erik at unicall.no]
To: doug at silicondesigns.com
Cc: davidabell at worldnet.att.net, pvperry at earthlink.net, DeTomaso at realbig.com
Sent: Wed, 30 Dec 2009 12:16:43 +0100
Subject: Re: [DeTomaso] NPC - Mustang Miss/Stumble problem

Probarly the MAP sensor ...

Erik

2009/12/30 Doug Braun <doug at silicondesigns.com>

> Try the cheapest thing first which would be the idle air control valve.
>  You won't be wasting your money either way because they tend to give out at
> about 60K miles anyway.  Changing it solved a problem similar to yours in
> both my 98 Cobra and my wife's 2002 Explorer.
>
> A good place to buy them is at www.rockauto.com
>
> Doug Braun
> blue 73L #5505
>
>
> ----- Original Message -----
> From:   David & Marilyn Bell [mailto:davidabell at worldnet.att.net]
> To: pvperry at earthlink.net,DeTomaso at realbig.com
> Sent:   Wed, 30 Dec 2009 00:49:37 -0600
> Subject: Re: [DeTomaso] NPC - Mustang Miss/Stumble problem
>
> Your symptoms sound fairly similar to the drivability problems I had with
> an
> older 4.6 T-Bird.  I changed out the MAF unit and everything was healed.
> MAF sensors are not cheap ($150) but luckily the guy next door let me
> borrow
> one off his T-Bird to check first.
>
> YMMV
>
> Dave Bell
>
> -----Original Message-----
> From: detomaso-bounces at realbig.com
> [mailto:detomaso-bounces at realbig.com]On Behalf Of Phil
> Sent: Tuesday, December 29, 2009 9:03 PM
> To: DeTomaso at realbig.com
> Subject: [DeTomaso] NPC - Mustang Miss/Stumble problem
>
>
> 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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