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Author Topic:   Carb help, or ???
Fastymz
Moderator

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

posted 08-06-2004 02:16 AM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
Since I've been cruising around alot and mostly waiting in traffic. My car will idle alittle more rough and idle down alittle if I rev it up it seems to go away,for a some time. And it I don't rev it and just start driving it kinda of hesitates then runs great.
I have not changed anything on the motor. Don't know why it just started to do this ?

I'm thinking maybe a PV ?
Other wise it runs and idles good, only if it sits at idle for sometime does it act up.

Any advice ?

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SCOOP

oddly obsessed with big scoops on little Mustangs

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

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Caution, keep kids and small pets away from the scoop.

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68F100
Gearhead

Posts: 2609
From: Burlington, Iowa
Registered: Oct 99

posted 08-06-2004 11:09 AM     Click Here to See the Profile for 68F100   Click Here to Email 68F100     Edit/Delete Message   Reply w/Quote
Just sounds like it is loading up at long idles. Couldn't tell ya how to fix it though. I'm still trying to get up the nerve to mess with mine.

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Fastymz
Moderator

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

posted 08-06-2004 12:18 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
Thats what I was thinking too Joe, but I don't know why it's doing that,and how to make it better ?

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SCOOP

oddly obsessed with big scoops on little Mustangs

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

My Pics

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Mpcoluv
Gearhead

Posts: 1333
From: Charlotte NC usa
Registered: Apr 2001

posted 08-06-2004 01:03 PM     Click Here to See the Profile for Mpcoluv   Click Here to Email Mpcoluv     Edit/Delete Message   Reply w/Quote
It sounds like it's loading up to me also.
You need to lean out the idle mixture.
You have a holley right?
Try to adjust you idle mixture screws a little leaner.
Is your ignition powerful enough?
I seem to remember that your cam is not too radical....so you really shouldn't have this problem.
Also make sure that the idle air bleeds are not blocked...

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MidLifCrisis
Gearhead

Posts: 540
From: Frederick County, MD
Registered: Oct 2001

posted 08-06-2004 09:31 PM     Click Here to See the Profile for MidLifCrisis   Click Here to Email MidLifCrisis     Edit/Delete Message   Reply w/Quote
wildfire466
Gearhead
Posts: 353
From: Cali
Registered: Mar 2004
posted 06-27-2004 11:19 PM
--------------------------------------------------------------------------------


I'm also thinking that the power valve in your carb might be the wrong one for your application. Last idea, you may wish to pull the carb and see if the throttle plates are into the idle transfer slot. What happens here is your pulling fuel from the idle transfer and then you have to lean out the idle screws. Idle effect WOT believe it or not. How many turns out are the idle screws?

Les

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http://www.geocities.com/wildfire1mustang/

wildfire466 said it best. I found a little headless screw under the secondary diaphragm that opened up the secondaries to increase idle without opening the primaries. Hope this helps. Charlie

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steve'66
Gearhead

Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000

posted 08-06-2004 09:47 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Hey Scoop,

I'll be in V.C. Monday and Tuesday, can I make a house call?

SteveW

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Fastymz
Moderator

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

posted 08-07-2004 11:41 AM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
Steve, Monday you could come by my work, I'll bring the car. or might be off on Tuesday let me know which one is better for you ?

You have mail too, it's kinda of a cool story.

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SCOOP

oddly obsessed with big scoops on little Mustangs

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

My Pics

[This message has been edited by Fastymz (edited 08-07-2004).]

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Fastymz
Moderator

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

posted 08-07-2004 02:00 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
I leaned out the A/F mixture alittle it didn't help. The car starts and runs great,until it idles once it's warmed up. Then it does the rough idle and idles down alittle. Once I rev it or drive it, it goes away for a short time. The only thing I did was change the fuel filter with the same model. I have not had the time to clean air bleeds yet.

I can't think of anything that would have blow out the PV. Except maybe when it was at the paint shop ?

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SCOOP

oddly obsessed with big scoops on little Mustangs

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

My Pics

[This message has been edited by Fastymz (edited 08-07-2004).]

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Mpcoluv
Gearhead

Posts: 1333
From: Charlotte NC usa
Registered: Apr 2001

posted 08-07-2004 05:00 PM     Click Here to See the Profile for Mpcoluv   Click Here to Email Mpcoluv     Edit/Delete Message   Reply w/Quote
Can you look down into the carb while this bad behavior is happening?
Is fuel drooling from the boosters?

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steve'66
Gearhead

Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000

posted 08-07-2004 05:33 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Cool story Ron,

You're like a long lost Cousin. Glen and I've been getting the motorhome ready for the trip to Eureka's Samoa Drag strip next weekend.

SteveW

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Fastymz
Moderator

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

posted 08-07-2004 07:10 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by steve'66:
Cool story Ron,

You're like a long lost Cousin. Glen and I've been getting the motorhome ready for the trip to Eureka's Samoa Drag strip next weekend.

SteveW


Yeah we are like family. Aren't you the lucky one

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SCOOP

oddly obsessed with big scoops on little Mustangs

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

My Pics

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steve'66
Gearhead

Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000

posted 08-07-2004 07:15 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
I always treated you like a little brother anyway. Huh??

SteveW

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Fastymz
Moderator

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

posted 08-07-2004 07:37 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
Yeah you have, thats cool to know that we are kinda family.

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SCOOP

oddly obsessed with big scoops on little Mustangs

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

My Pics

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