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Author
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Topic: One more question about my 700dp
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Fastymz
Moderator Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 09-21-2004 11:35 AM
   
When I got the carb it had a manual choke installed. I removed it from the carb and didn't re-use it. I have always ran without a choke. I just remembered last night that I never plugged or even checked to see if there were any vacuum sources behind the manual choke plate on the carb body. Do I need to the plug the vacuum passage in the same spot that I plugged on my 600vs with an electric choke. If thats a open vacuum source that might the were the idle problems are comong from. Thanks  ------------------
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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capri man
Gearhead Posts: 7249
From: doerun, ga.
Registered: Nov 2000
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posted 09-21-2004 11:45 AM
i think there is one to plug ron. just start the engine and put your finger over all the holes and you can tell.------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.33 @92mph 1/8
1.54 60 ft. http://community.prestage.com/Member+Pages/789.aspx
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Fastymz
Moderator Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 09-21-2004 06:11 PM
I replaced the PV with a 6.5, and plugged the choke vacuum passage. i didn't check for vacuum there before I plugged, but the car seems to idle a lot better and no more leaks from anywhere, so far.  I let it warm up to 180 degree's at idle only. It never missed a beat. I hope I have the idle and leaking problems behind now. I still need to take it for a test drive. But today is moving day for me.  Man moving just SUCKS big time. ------------------
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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Fastymz
Moderator Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 09-22-2004 01:19 AM
I took my car over to the garage at the Apt, we are renting. It started and idled ok, until I drove it. It's still loading up and almost die's ? Besides loading up at idle and small bog when it's first floored. It ran real strong once it got going. I hit it once from about 30mph in second gear, again a bog but then it went great. So I still need help with the it loading up at idle and at cruise, and now a bog when it's first floored ? Help please If it bogs right away it needs more or less fuel ? Loading up idle could be ? ------------------
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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Fastymz
Moderator Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 09-22-2004 01:23 AM
I also noticed it popped out of the carb when I went to first start it. Could the idle and loading up problems be in the ignition and not in carb at all ?------------------
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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Dubz
Gearhead Posts: 1890
From: Manitoba Canada
Registered: Oct 2002
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posted 09-22-2004 01:24 AM
what do you have for an ignition setup?[This message has been edited by Dubz (edited 09-22-2004).]
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Fastymz
Moderator Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 09-22-2004 01:30 AM
Dura sprak unit and dist, a MSD blaster coil. ------------------
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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Dubz
Gearhead Posts: 1890
From: Manitoba Canada
Registered: Oct 2002
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posted 09-22-2004 01:43 AM
wouldn't it have been a problem with the old carb though if it was ignition??
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Fastymz
Moderator Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 09-22-2004 01:47 AM
Yeah thats what I was thinking too. But I don't want to over look anything. But keep in mind with the old carb it just started loading up, but other wised idled and ran great.
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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 09-22-2004).] [This message has been edited by Fastymz (edited 09-22-2004).]
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FiveOFastback
Gearhead Posts: 110
From: Bethlehem, PA, USA
Registered: Nov 2003
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posted 09-22-2004 11:42 AM
Fastmyz
I would think the reason its loading up is because you let it idle up to 180deg. and the plugs get loaded up and need to be cleared out with a few 3500-4500rpm revs. Try that the next time, then go get on it on the test drive. Same problem my father and I had our first time out in the 67 after the body shop.
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 09-22-2004 01:11 PM
Are you using a filter right before the carb? Have you installed new block gaskets lately? The 650 that I was tuning on last week needed larger jets when the weather cooled off. 70 in front and 78 in the rear, 31/33 squirts, new gaskets, and I set the rear butterflies just on top of the transfer slots. After warming it up and setting mixture and idle speed, it runs damn near perfect. Good luck with yours. ------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank, rods and girdle, TFS alum. heads, Stealth 8020 intake, Xtreme 268 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
11.86 @ 116 mph (7.62 @ 93 mph)daily driver!
DanH
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rockafellz
Gearhead Posts: 1443
From: San Lorenzo, CA, USA
Registered: Aug 2001
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posted 09-22-2004 01:27 PM
Hey Ron,I haven't shipped the package yet. I keep forgetting. Doh!!  Give me a call on my cell later or msg me on yahoo to remind me pls!! Erik ------------------
1966 Ford Mustang 2+2
Father & Son built w/M&M Help :cool:
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Fastymz
Moderator Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 09-22-2004 01:34 PM
If I rev, or run it hard it'll clean for a few seconds and then go right back to loading up and dragging the idle down. Until I rev it etc ?I put all new gaskets and cleaned to carb out, and then blew it all out with compressed air. My inline filter is right after the mech, fuel pump. ------------------
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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JCQuinn@work
Gearhead Posts: 899
From: Lakewood, CO, USA
Registered: Jun 2001
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posted 09-22-2004 02:21 PM
I didn'r read all of the replies so I may be duplicating advice but anyway....The most common cause of loading up at idle with a Holley is having the floats set too high. When the fuel level in the bowl is too high gas dribbles out into the venturi causing the loading up. The slight hesitation when you mash the throttle is probably due to the setting of the accelorater pump lever. The lever should be moved enough to get a squirt of gas when the butterflies begin to open. To correct this Holley makes several pump cams that have various lift rates. Sometimes the pump lever just needs to be bent a little bit so it makes better contact with the pump cam. Happy Holleying
John
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Fastymz
Moderator Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 09-23-2004 02:35 AM
Thanks John, I need to check the float level again. I use sight plugs I can't always tell how low the fuel is. Thanks to you all, this is driving me crazy, I'm trying not to drive you all crazy too.  ------------------
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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JCQuinn@work
Gearhead Posts: 899
From: Lakewood, CO, USA
Registered: Jun 2001
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posted 09-23-2004 04:33 PM
I should also mention that setting the float so that fuel just dribbles out of the hole in the float bowl isn't always the best. All the holley books say to set the fuel there but I have had experience where that setting was too high for my car. I start at that setting and if fuel is still dribbling out, I lower the float until the dribbling stops. Look in the carb while the engine is running, you can see the dribbling.John
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SteveLaRiviere
Administrator Posts: 44935
From: Saco, Maine
Registered: May 99
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posted 09-23-2004 06:11 PM
I agree with John. I like to take the sight plugs off and lower the level until you need to rock the car before the fuel trickles out. ------------------
'70 Mustang Mach 1 351C 4V/FMX/3.25 Open
'70 Mustang Convertible 250 I6/3 speed/2.79 Open
'72 Mustang Sprint Hardtop 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
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n2oMike
Gearhead Posts: 2694
From: Spencer, WV
Registered: Jan 2001
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posted 09-23-2004 08:42 PM
It won't affect the running, but the hole where the choke linkage comes up needs plugged or it will be a source for unfiltered air.As for setting the float level, it won't change instantly when dropping the level. The fuel needs time to get consumed by the engine as the float is lowered. ------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220
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Fastymz
Moderator Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 09-24-2004 01:45 AM
Thanks for the advice, as soon as I get some time I'll try adjusting the floats. ------------------
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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Ryan Wilke
Gearhead Posts: 2289
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 09-24-2004 07:29 AM
quote:
Originally posted by n2oMike:It won't affect the running, but the hole where the choke linkage comes up needs plugged or it will be a source for unfiltered air.
Mike,
What would you recommend to plug the hole - just a dab of silicone maybe? Thanks!
Ryan
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bud4660
Gearhead Posts: 528
From: Mesquite, Tx. M&M #2925
Registered: Apr 2003
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posted 09-24-2004 09:12 AM
quote:
Originally posted by Fastymz:
I also noticed it popped out of the carb when I went to first start it. Could the idle and loading up problems be in the ignition and not in carb at all ?
Scoop anytime the carb backfires you can blow the powervalve. With it running look down the carb and see if you can see fuel dripping or running down the inside. Also on this.
"Besides loading up at idle and small bog when it's first floored. It ran real strong once it got going. I hit it once from about 30mph in second gear, again a bog but then it went great."
It could be starving for fuel. Its hard to tell without playing with the jets and looking at the plugs. But alot of people think what feels like a bog is from to much fuel. Most of the time its from to much air and not enough fuel. When you snap the throttle open it has to have lots of fuel quick for all that air you just let in. I like to run 50cc pumps and big squirters on both ends. But I dont drive it on the street either. The cam that drives the pump has two holes for adjustments. Try setting it up to the next one. I bought one of those cam kits with all the different sizes. Ended up just using the one that came on the carb. It seemed to work better..lol
Bud
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