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Author Topic:   Idle stumble
Fastymz
Moderator

Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001

posted 05-19-2003 04:52 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
It started last week.It only does it when the car is warm.I cleaned out the needle seats.I watched and could not see anything leaking.It seems to only happen when the car is warmed up.And only at idle so far.I can't find any vacuum leaks.Expect that the throtle shafts both front and back get alittle wet.So I think they are leaking?
But if I spray carb clean or WD on them it does change anything?

The idle will jump 100-200 rpm down.
And bounce right back,the car runs fine other ways.

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SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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N266fords
Gearhead

Posts: 1652
From: Sierra Vista ,Az USA
Registered: Apr 2003

posted 05-19-2003 05:21 PM     Click Here to See the Profile for N266fords   Click Here to Email N266fords     Edit/Delete Message   Reply w/Quote
Could it be a restricted fuel filter or surging pump. just a thought on what i would look into..Bruce

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johnmustang
Gearhead

Posts: 6061
From: British Columbia , Canada
Registered: Nov 2001

posted 05-19-2003 07:15 PM     Click Here to See the Profile for johnmustang   Click Here to Email johnmustang     Edit/Delete Message   Reply w/Quote
Ron,

Just a thought and I am sure that the guys on here with more and better experience than I have will really get it figured out for you, but is your idle circuit leaking down on you ? You may also want to look at your ignition system especially your coil. I had one start to go bad on me on my 68 before I sold it and it caused this exact problem that you are describing. Just my .02, hope you get it figured out quickly.


JOHN

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65 2+2 FASTBACK
87 TAURUS WAGON
98 F150 XLT TRITON V8 4.6, 4 WHEEL DRIVE
Member:Vancouver Island Mustang Association
M&M #1710
MyPhotoPage
MY TRUCK

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Fastymz
Moderator

Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001

posted 05-19-2003 07:15 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
Ok to make things worst.It only does it once in while.It will act up and I can't get it to stop and other times I can't get it to it.

I do notice if I'm cruising real slow for some time.Then get on it alittle it you can smell gas.And alittle lite blue smoke will come out the pipes too.
The plugs look great so I don't think it's running rich.

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SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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Fastymz
Moderator

Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001

posted 05-19-2003 07:17 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
John I hope not it's a new pertronixII coil I got it in Feb of this year.

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SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

IP: Logged

johnmustang
Gearhead

Posts: 6061
From: British Columbia , Canada
Registered: Nov 2001

posted 05-19-2003 07:30 PM     Click Here to See the Profile for johnmustang   Click Here to Email johnmustang     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Fastymz:
John I hope not it's a new pertronixII coil I got it in Feb of this year.


RON,

The coil that went out on me was also a pertronix coil and it was only in for about four months . So just before I sold the 68 I put in a stock ford coil and put in points and condenser, car didn,t miss a beat after that.


JOHN

------------------
65 2+2 FASTBACK
87 TAURUS WAGON
98 F150 XLT TRITON V8 4.6, 4 WHEEL DRIVE
Member:Vancouver Island Mustang Association
M&M #1710
MyPhotoPage
MY TRUCK

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Fastymz
Moderator

Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001

posted 05-19-2003 07:45 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
John I have to older coils setting around.I might put one of then in.
But I really think it's in the carb.

------------------
SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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V8 Thumper
Gearhead

Posts: 4652
From: Phoenix, Arizona
Registered: Dec 2001

posted 05-19-2003 08:05 PM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
Hey Ron, what jets/squirter/power valve do you have in it?

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1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9"

All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html

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johnmustang
Gearhead

Posts: 6061
From: British Columbia , Canada
Registered: Nov 2001

posted 05-19-2003 08:07 PM     Click Here to See the Profile for johnmustang   Click Here to Email johnmustang     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Fastymz:
John I have to older coils setting around.I might put one of then in.
But I really think it's in the carb.


You are probably right, just throwing out some ideas for you. I am sure you will track it down pretty quick.

JOHN

------------------
65 2+2 FASTBACK
87 TAURUS WAGON
98 F150 XLT TRITON V8 4.6, 4 WHEEL DRIVE
Member:Vancouver Island Mustang Association
M&M #1710
MyPhotoPage
MY TRUCK

IP: Logged

Fastymz
Moderator

Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001

posted 05-19-2003 08:20 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
Todd a #35 squirter and a 6.5 power valve.

I might try and change the power and see if that helps.
It did something like this once before.ANd it was a power valve.But then it was surging at cruise speed too.

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SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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