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Author
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Topic: Carb Adjustment, Hesitation on acceleration
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Roadkill
Journeyman Posts: 80
From: Chesterfield, Mi, 48047
Registered: Jun 2005
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posted 09-08-2005 04:44 PM
 
I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. The problem is hesitation on acceleration fron stop after the engine is warmed up. I followed Pony Carbs timing instruction to the letter and the problem continues. Per Pony Carbs timing instruction initial advance was at 20 degrees, mechanical at 18 degrees and John told me on the phone to add more initial advance but this seemed to make the engine run worse. Could my problem be in the Carb, I have no clue at this point. Any suggestions would be appreciated. Thanks Ed
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mustangboy
Gearhead Posts: 1343
From: Ont, Canada
Registered: Mar 2002
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posted 09-08-2005 09:07 PM
Seems a little strange that the problem only occurs when the engine is warm.It sounds like a possible lean condition which is usually worse when the engine is cold,unless your running a choke and it runs good until the choke kicks off.Other things to check are, is the fuel boiling in the carb or is the gas line near hot exhaust etc?...Or to look at it as a possible rich condition,is the choke kicking off completely when the engine is warm?
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1968 mustang j-code sprint.13.69@101 306cu.in, stock ported heads,weiand exellerator,650 holley DP,hedman hedders,comp 292 Magnum cam,4-speed,8 inch 4.11 detroit locker...................................................................1966 mustang coupe project.289 4 speed,3.20 rear http://mustangsandmore.50megs.com/MembersPics/mustangboy.html[This message has been edited by mustangboy (edited 09-08-2005).]
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Roadkill
Journeyman Posts: 80
From: Chesterfield, Mi, 48047
Registered: Jun 2005
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posted 09-08-2005 10:52 PM
Thanks for the reply. The problem is not there when the engine is cold and the choke closed. The hesitation occurs after the choke is opened an engine hot. The fuel line is far enough away so I dont think it is a vapor lock. A friend told me it could possible be a squiter problem but John at Pony Carburetors said he didn't think so. He kept telling me to advance my timing more, but when I did the engine would sputter at 40-50 mph and the hesitation was still there. This is why I need some help to find the cause. Ed
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trashline
Gearhead Posts: 2230
From: Levittown, Pa
Registered: Dec 2003
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posted 09-08-2005 11:40 PM
huh... keep advancing the timing so you get detonation and he can buy you a new motor? that makes sense.how did the car run before the carb if it ran at all? if it ran fine i blame the carb. slap a vacuum gauge on there and se wherre it is at should be around 18 + or - 1. if it is a stock cam. are you getting any detonation? did you try re setting the timing? the finger on plug #1 trick will work. find tdc and set the cap to #1. is it like a starving fuel hesitation? like it wants to die? maybe a clogged fuel filter or bad pump. damn just remembered it only does it when hot. lol. sure the choke plate is opening properly? timing wont have an effect if the motor is hot or not. it always has to advance the same no matter what. still check the fuel filter. and feel those fuel lines after a hot drive. heat under the hood can get hot. you running headers? ------------------
88 thunderbird TC 2.3L
Gillis at 15 psi, walbro 255 lph fuel pump, Kirban at 39 psi, 3.73 8.8" rear, rebuilt head, brand new IHI 66 mustang 200ci 3 speed
Holley weber two barrel, msd 6A, 3.5 gears, 3.03 v8 three speed trans. 68 Fairlane 289 w/ auto
rusting away motor is going in the mustang 79 f150 300 3 onda tree
awaiting a new transmission
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mustangboy
Gearhead Posts: 1343
From: Ont, Canada
Registered: Mar 2002
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posted 09-09-2005 01:12 AM
If you had a holley I would say try a different cam for the accelerator pump or a bigger squirter but I really don't know how to make many adjustments on a stock ford carb.I guess check the accelerator pump and make sure it is working good(a good strong squirt down each primary barrel) and there is no delay in the linkage.The accelerator pump linkage should start to move as soon as you move the throttle linkage.Sounds like the choke is covering up this condition when it is on.You might also want to check for vacuum leaks.------------------
1968 mustang j-code sprint.13.69@101 306cu.in, stock ported heads,weiand exellerator,650 holley DP,hedman hedders,comp 292 Magnum cam,4-speed,8 inch 4.11 detroit locker...................................................................1966 mustang coupe project.289 4 speed,3.20 rear http://mustangsandmore.50megs.com/MembersPics/mustangboy.html [This message has been edited by mustangboy (edited 09-09-2005).]
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Roadkill
Journeyman Posts: 80
From: Chesterfield, Mi, 48047
Registered: Jun 2005
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posted 09-09-2005 09:51 AM
Some time ago aftr the carb was installed I did go back and I found TDC and put a timing tape on the damper. I reset timing to 20 degrees and the engine runs good while cruising no pinging. I also replaced the fuel line the previous owner installed one that ran right along the engine block and radiator hose but now the proper on is there with plenty of clearence. The choke plate is working properly wide open after the engine is warmed up and it does feel like fuel starvation that all of a sudden kicks in after the car is moving. Press the pedal from a stop it kinda bogs then off it goes. Ed
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ddenton749
unregistered
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posted 09-09-2005 10:19 AM
Sounds like the accelerator pump to me.------------------
'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club
"I may not have gone where I intended to go, but I think I have ended up where I needed to be."
My Site
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trashline
Gearhead Posts: 2230
From: Levittown, Pa
Registered: Dec 2003
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posted 09-09-2005 11:39 AM
detonation doesnt happen whne just cruising usually happen at like WOT. just b/c the lines have clearance doesnt mean they dont get hot you have to feel them. get the car warmed up shut it off go under the hood with the choke open and pull on the linkage make sure the fuel is shooting into the carb venturis(spelling). it almost sounds like a lean condition which is fine when the choke is closed b/c there is less air for the smaller amount of fuel but when the choke opens theres more air but not enough fuel. check the acc pumps maybe theres a hole in them and check jet sizes while your at it. and check the float level just for the heck of it.------------------
88 thunderbird TC 2.3L
Gillis at 15 psi, walbro 255 lph fuel pump, Kirban at 39 psi, 3.73 8.8" rear, rebuilt head, brand new IHI 66 mustang 200ci 3 speed
Holley weber two barrel, msd 6A, 3.5 gears, 3.03 v8 three speed trans. 68 Fairlane 289 w/ auto
rusting away motor is going in the mustang 79 f150 300 3 onda tree
awaiting a new transmission
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Roadkill
Journeyman Posts: 80
From: Chesterfield, Mi, 48047
Registered: Jun 2005
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posted 09-09-2005 03:29 PM
Changed out the fuel filters the one in the cup on the fuel pump was pretty dirty almost black and some sediment was in the bottom of the cup. put it all back together ant took it out, ran better but the slight hesitation was still there. John at Pony Carbs also told me the last time I called him that these carbs are set a little lean could that be causing the problem and if so how is it fixed Thanks Ed
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trashline
Gearhead Posts: 2230
From: Levittown, Pa
Registered: Dec 2003
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posted 09-09-2005 04:45 PM
you need to find the air mixture screws on the side of the air horns somewhere. or chnage out the jets. i think this might be your problem. is your 302 bone stock? if not what mods do you have? usually people put 4 barrels on so im thinking your motor is all stock.------------------
88 thunderbird TC 2.3L
Gillis at 15 psi, walbro 255 lph fuel pump, Kirban at 39 psi, 3.73 8.8" rear, rebuilt head, brand new IHI 66 mustang 200ci 3 speed
Holley weber two barrel, msd 6A, 3.5 gears, 3.03 v8 three speed trans. 68 Fairlane 289 w/ auto
rusting away motor is going in the mustang 79 f150 300 3 onda tree
awaiting a new transmission
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Roadkill
Journeyman Posts: 80
From: Chesterfield, Mi, 48047
Registered: Jun 2005
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posted 09-09-2005 05:38 PM
Engine is all stock except the MDS ready to run distributor I put on a couple of months back and a magna flow dual exhaust system with H pipe other than that all stock.
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