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Author
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Topic: It is FIXED!! On to new problems.
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rmousir
Gearhead Posts: 1124
From: Amelia, Ohio
Registered: May 2003
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posted 05-21-2006 09:47 AM
 
Hey All,The GOOD! Just wanted to let you know that it, "The Leak", is fixed. No more leak. No more leak. Also got the car running and it sounds good. Super good. THE BAD!!
The carb is surging. I have read that there are many causes to this so this is what i have done. Confirmed that there are no vacume leaks. I plugged all vacume lines and did the wd40 test. No change. Also set the timing ret and adv and no change. Just try to get it idleing good. and can't seem to get it to. It just idles to high and won't come down. When I do get it to idle low (lower rather) and put the car in gear it dies. Could this be the carb? I think the carb is in excellent order as it was just rebuild but a Mustang Pro. Of course I am still a rookie so I just don't know. Thoughts??? I just don't know where to take it from here but I am going to do some heavy reading this afternoon when it rains. The rain is coming.
THE UGLY!!!
Did not get to take the car out for a drive yet. :-(
Richard. ------------------
rmousir
'66 Mustang Coupe
Ford Blue & white stripes
'95 302 auto
Mustang ~ 04-05
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Mark Ugrich
Gearhead Posts: 351
From: Waukesha, Wisconsin,U.S.A.
Registered: Jan 2006
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posted 05-21-2006 03:13 PM
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Darryl Eichenlaub
Gearhead Posts: 124
From: Buckley,Wa.
Registered: Dec 2005
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posted 05-21-2006 05:00 PM
Glad to hear about the leak. One thought about the surgeing. I once had a carb that I chased my tail on. It was a worn out bushing on the throttle shaft. I used starting fluid to find it. Don't spray directly into the bushing spray along the side with the throttle at different settings. Good luck. Darryl
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Fastymz
Moderator Posts: 22791
From: Reno Nv M&M #1240
Registered: Apr 2001
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posted 05-21-2006 06:27 PM
As for the idle did you try adjustig the A/F mixture?
I'd pull the carb and make sure the gaskets are good.------------------
oddly obsessed with big scoops on little Mustangs HOOD HACKERS DELIGHT!
My Pics
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sprcoop
Gearhead Posts: 780
From: Tucson, AZ usa
Registered: Jan 2000
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posted 05-21-2006 06:38 PM
Won't idle low enough. Is it a Holley or an Autolite? Has it ever backfired through the carb? Just went through this. Blown power valve caused that for me. HTH
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69 Sportsroof
Gearhead Posts: 2814
From: Valley, Alabama, USA
Registered: Mar 2002
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posted 05-21-2006 06:56 PM
What ignition are you running?
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rmousir
Gearhead Posts: 1124
From: Amelia, Ohio
Registered: May 2003
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posted 05-21-2006 09:38 PM
running the pertronix set up.the carb has back fired up out the carb twice now. It is auto lite 4100 carb. My buddy is going to bring his car by and let me try his carb to see if that is the problem or not. I have checked the seals on the base of the carb and on the spacer with wd-40 and they are good. I have also adjusted the A/F mixture with no change in the surging or lowering the idle. I don't know anythig about carbs so this is a learning experiance for me. The carb is freshly rebuilt by a knowledgable mustang member here.
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68F100
Gearhead Posts: 2835
From: Burlington, Iowa
Registered: Oct 99
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posted 05-21-2006 11:09 PM
My first thought is bad base gasket. I went crazy looking for the cause on my first carb swap, and that was it. A couple bucks later for a new carb base gasket fixed it.
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sprcoop
Gearhead Posts: 780
From: Tucson, AZ usa
Registered: Jan 2000
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posted 05-21-2006 11:25 PM
Ok, backfire through carb = blown power valve on a 4100 (same as mine and it only backfired once). $8 fix. Get a Holley at Chiefs or Trak or Pep Boys, they fit. I got a 6.5 but I think Alex recommends lower sometimes. I could not tell mine was blown but replacing it fixed the idle issue. Also, 4100's are particular about the base gasket because of vacuum circuits there (causing internal vacuum leaks). Alex sez,"Best gaskets are #1909 Fel-Pro "stick um" performance gaskets." Alex also sez, "Make sure you have a larger Holley type steel shim plate and gaskets like the #55 Mr. G units.
Most aftermarket SBF aluminum intakes are too small in the carb flange area to seal a 4100 without the shim and large base style gasket." The stock paper ones don't get it done. HTH
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rmousir
Gearhead Posts: 1124
From: Amelia, Ohio
Registered: May 2003
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posted 05-22-2006 07:44 AM
quote:
Originally posted by sprcoop:
Ok, backfire through carb = blown power valve on a 4100 (same as mine and it only backfired once). $8 fix. Get a Holley at Chiefs or Trak or Pep Boys, they fit. I got a 6.5 but I think Alex recommends lower sometimes. I could not tell mine was blown but replacing it fixed the idle issue. Also, 4100's are particular about the base gasket because of vacuum circuits there (causing internal vacuum leaks). Alex sez,"Best gaskets are #1909 Fel-Pro "stick um" performance gaskets." Alex also sez, "Make sure you have a larger Holley type steel shim plate and gaskets like the #55 Mr. G units.
Most aftermarket SBF aluminum intakes are too small in the carb flange area to seal a 4100 without the shim and large base style gasket." The stock paper ones don't get it done. HTH
OK. so new gaskets. No problem. I can pick those up next week and put them on. Power valve, problem. What is it? What does it do? Where is it? How would I change it? I am sure I can change it as long as I know where it is. Do you have a picture or a diagram that I could follow? Thanks very much for the info. I would never have any clue what to do. Richard.
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Green68
Journeyman Posts: 48
From: San Antonio, TX, USA
Registered: Aug 2005
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posted 05-22-2006 12:30 PM
http://cgi.ebay.com/ebaymotors/1961-1962-1963-THUNDERBIRD-AUTOLITE-4100-CARBURETOR_W0QQcmdZViewItemQQcategoryZ34198QQitemZ4567481730Here's a 4100 on e-bay for reference. Look at the picture of the carb from the bottom. See the square plate with 4 screws on the bottom between the idle mixture screws? Remove that cover, beneath the cover is the power valve. Use a big socket or wrench to unscrew the power valve. Be sure to use a new gasket on the power valve when you screw it back in and a new cover plate gasket. In some books the power valve is also called an economizer valve....Go figure.  ------------------
'68 302 2v C4
All stock ragtop
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sprcoop
Gearhead Posts: 780
From: Tucson, AZ usa
Registered: Jan 2000
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posted 05-22-2006 02:03 PM
This blurb from the Ford shop manual and Mustangsandmore.com is where I learned all I know about the power valve (which ain't much) HTH 
 The last sentence on the left on the bottom under the diagram is the only one relevant to the text.
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rmousir
Gearhead Posts: 1124
From: Amelia, Ohio
Registered: May 2003
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posted 05-25-2006 02:17 PM
quote:
Originally posted by sprcoop:
Ok, backfire through carb = blown power valve on a 4100 (same as mine and it only backfired once). $8 fix. Get a Holley at Chiefs or Trak or Pep Boys, they fit. I got a 6.5 but I think Alex recommends lower sometimes. I could not tell mine was blown but replacing it fixed the idle issue. HTH
Would anyone happen to have a part number on that? I am going to call pep boyz this afternoon and the counter guys don't know to much. Richard.
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sprcoop
Gearhead Posts: 780
From: Tucson, AZ usa
Registered: Jan 2000
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posted 05-25-2006 03:04 PM
Here is the part number at Summit but it was actually hanging on the rack, didn't have to go to the counter at Checker.http://store.summitracing.com/egnsearch.asp?Ntk=KeywordSearch&DDS=1&Ntt=125%2D65&searchinresults=false&N=115 I think it's 125-(size) as in 125-65 is for a 6.5 in. HG which (I believe) has to do with the spring pressure for how soon it opens. HTH
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rmousir
Gearhead Posts: 1124
From: Amelia, Ohio
Registered: May 2003
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posted 05-26-2006 01:25 PM
the local autozone ordered it for me and will be in today. I will pick it up today and see if I can find some time for this over the weekend. Wish me luck!Richard.
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sprcoop
Gearhead Posts: 780
From: Tucson, AZ usa
Registered: Jan 2000
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posted 05-26-2006 05:16 PM
Richard, you won't need any luck (unless that's not the reason your car won't idle correctly). If you have ever taken a carb off a car before it will be 20 minutes from open to close of hood. I can tell you it was nice not having the idle at 1500 just so I could drive it. Good luck anyways.
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