Pedal to floor= bad performance? please diagnose
2nd Gear Member
Joined: Oct 2006
Posts: 163
From:
RE: Pedal to floor= bad performance? please diagnose
try your distrputor cap thats what was wrong with my 94 silverado
http://tinypic.com/view.php?pic=52ms7ec
http://tinypic.com/view.php?pic=52ms7ec
5th Gear Member
Joined: Sep 2006
Posts: 3,302
From: Northernish Eastish Central Texas
RE: Pedal to floor= bad performance? please diagnose
ORIGINAL: Soaring
Well guess what Jimbo, these old 1960's model cars were invented about 20 years before the 80's EFI engines. I think you have a very decent restomod, but it is just that, a restomodwith not identity other than your signature car. It is not original in any respect, but it is what you built for you personally. That is fine, but don't pass it off as a Mustang.
ORIGINAL: JamesW
hey heyyyyy.... 5.0s were updated in the late 80s to run with a freak EFI system... I'm not a fan of putting EFI on an original 289 or 302 either.....
ORIGINAL: Soaring
My recommendation would be to throw that friggin Holley in the trash and put on a decent carb like a motorcraft that these engines were designed to run with. They certainly were not designed to run with a freak EFI system.
My recommendation would be to throw that friggin Holley in the trash and put on a decent carb like a motorcraft that these engines were designed to run with. They certainly were not designed to run with a freak EFI system.
[sm=noooo.gif]...... you did not just go there...again.
And just when I thought we were all playing nicely...
5th Gear Member
Joined: Sep 2006
Posts: 3,302
From: Northernish Eastish Central Texas
RE: Pedal to floor= bad performance? please diagnose
Patrick..you just keep asking all the restomod questions you want man.... we'll try to help.
Just ignore Glen. He's just [sm=icon_stickpoke.gif]cuz he enjoy's it and likes to get a rise out of me sometimes.
Just ignore Glen. He's just [sm=icon_stickpoke.gif]cuz he enjoy's it and likes to get a rise out of me sometimes.
6th Gear Member
Joined: Apr 2007
Posts: 10,468
From: California
RE: Pedal to floor= bad performance? please diagnose
Ok, here goes. Does the car stumble/bog momentarily going to WOT then run ok? Or does it just run like crap all the way around at WOT? That's gonna make a HUGE difference in what you need to do. It could be jetting, or accelerator pump, or secondary opening rate. As far as which way to go, look at your plugs. That'll tell you whether it needs more or less fuel. If it's very lean at full throttle it will sputter and cough, it can sputter and cough if it's too rich as well, plugs will tell you. If it's only stumbling going to WOT then start with the accelerator pump, if it stumbles hard then goes you prolly need a bigger shooter, if it starts to go, bogs then goes, you might need a smaller shooter, then when you throw in pump cams and vaccum secondary spring rates, you have a lot of tuning to do. And you could always convert to EFI if you got the cash, there are decent standalone systems to do such. And having EFI in a 60's Mustang doesn't make it not a Mustang, it just doesn't make it a factory Mustang. I may eventually go to Edelbrock's Pro Flo setup, just because I don't want to have to deal with tuning a blow through carb setup with a centrifugalsupercharger, and it's easier to adjust the tune than with a carb
6th Gear Member
Joined: Jan 2007
Posts: 5,469
From: AR
RE: Pedal to floor= bad performance? please diagnose
I woud try changing the fuel filter first....... before jumping into a carb overhaul or a new carb,,,,
The performance problems you describe match the symptoms caused by a plugged fuel filter, I am not saying that this is the problem, but it is cheap and easy to replace the fuel filter. Just from what you say here, I would put the odds at about 40%.
The performance problems you describe match the symptoms caused by a plugged fuel filter, I am not saying that this is the problem, but it is cheap and easy to replace the fuel filter. Just from what you say here, I would put the odds at about 40%.
6th Gear Member
Joined: Oct 2006
Posts: 8,162
From:
RE: Pedal to floor= bad performance? please diagnose
since you bought the car used and who knows the last thing anything on it was changed . id give it a full tune up plugs plug wires points cap oil oil filter airfilter fuel filter
3rd Gear Member
Joined: Nov 2006
Posts: 534
From:
RE: Pedal to floor= bad performance? please diagnose
"My recommendation would be to throw that friggin Holley in the trash and put on a decent carb like a motorcraft that these engines were designed to run with."
Hey Soaring: Guess the carburetor of choice for Mr. Shellby's '65 GT350.... a HOLLY 4150! Go tell him his creation was no Mustang!
Hey Soaring: Guess the carburetor of choice for Mr. Shellby's '65 GT350.... a HOLLY 4150! Go tell him his creation was no Mustang!
3rd Gear Member
Joined: Feb 2007
Posts: 551
RE: Pedal to floor= bad performance? please diagnose
ORIGINAL: restomod87
Hey fellas, As the week has gone by i'm learning more and more about my new mustang, but along with all the good, comes the questions when you run into something out of the ordinary...Here is my Question:
My car is cranking and driving wonderfully at the moment, however I cannot and have not pushed my car performance wise because when i push the pedal to the floor (or give it alot of gas) it will almost hickup and seemingly choke a little. I am not very good with cars, and i'm going to see if my dad can take a look at it tonight, but i wanted to see if anyone has experienced this. My car was originally a 289 C code v2 carb. It has since been redone, and is now a 289 v4 carb with headers and holly. What could be the problem? Would the stock fuel pump be the cause of this? I'm not sure if it's a air issue or a fuel issue...thanks for all the other help i've recieved with other small things concerning my car and i hope this is an easy fix as well! I appriciate my car as a classic, and am not one to do burnouts or drive my car very hard, but periodically I would at least like to be able to gun it and show what my car can do without this choking out/ hickup thing.
P.S. the car doesn't choke completely out, it's just like it's not getting enough fuel for the engine to run at that speed and sputs and is not as intended...thanks
Hey fellas, As the week has gone by i'm learning more and more about my new mustang, but along with all the good, comes the questions when you run into something out of the ordinary...Here is my Question:
My car is cranking and driving wonderfully at the moment, however I cannot and have not pushed my car performance wise because when i push the pedal to the floor (or give it alot of gas) it will almost hickup and seemingly choke a little. I am not very good with cars, and i'm going to see if my dad can take a look at it tonight, but i wanted to see if anyone has experienced this. My car was originally a 289 C code v2 carb. It has since been redone, and is now a 289 v4 carb with headers and holly. What could be the problem? Would the stock fuel pump be the cause of this? I'm not sure if it's a air issue or a fuel issue...thanks for all the other help i've recieved with other small things concerning my car and i hope this is an easy fix as well! I appriciate my car as a classic, and am not one to do burnouts or drive my car very hard, but periodically I would at least like to be able to gun it and show what my car can do without this choking out/ hickup thing.
P.S. the car doesn't choke completely out, it's just like it's not getting enough fuel for the engine to run at that speed and sputs and is not as intended...thanks
1. Check compression.
2. If '1' is good, go to vacum
3. Make sure ignition is spot on
My gut is you have a vacum problem.....don't assume that.....see above. It makes no sence to chase a carb 'problem' when the carb is reacting to the signal it is recieving from the engine. If that signal is flawed it will not matter what you do to the carb...it won't work. Verify the engine condition of the engine FIRST!!