Pedal to floor= bad performance? please diagnose
3rd Gear Member
Joined: Feb 2007
Posts: 551
RE: Pedal to floor= bad performance? please diagnose
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.
5th Gear Member
Joined: Nov 2006
Posts: 2,287
From: North Fulton, GA
RE: Pedal to floor= bad performance? please diagnose
ORIGINAL: colostang
What is that yellow car in your signature Soaring? I can't tell because the wheels and tires have modified it beyond recognition.
What is that yellow car in your signature Soaring? I can't tell because the wheels and tires have modified it beyond recognition.
Any emotional attachmentes aside, I'm betting that 9 out of 10 guys on this board with real "Mustangs" would trade straight up for Jim's creation without thinking twice.[sm=bustedsign.gif]
To the OP, give it your best shot doing the obvious stuff first. Make sure you're plugs/wires/cap/rotor are in good shape and the timing/vac advance are rightso you know you're getting good spark. Make sure the fuel pressure is where it has to be and the float levels are properly set. Get a vacuum guage and make sure your idle mixture is adjusted properly and make sure your accelerator pump is squirting gas.
If it still isn't running correctly, you've got some decisions to make. Like James mentioned, a new carb can be had at a reasonable price, especially if you're not up to rebuilding one yourself. Myself, I've always considered the 600-cfm Holleys to be 'disposable' in that it is almost easier to sell your old one on Ebay and pick up a new one for a few hundred bucks. That isn't the path many will be happy with, but so be it.
If I were you, and you don't feel a need to do everything yourself, I'd find a good dynotuner in town and get them to dial it in. I paid $150 to get my new Ford Racing crate motor, MSD dizzy and Edelbrock Thunder AVS carb all dialed in. The thing rolled off of the trailer as a dog and was an all new vehicle when I picked it up. I'm pretty good with a wrench, but I don't pretend to have half the ability and "feel" for tune that somebody who has been doing it for nearly 40 years does.
Good luck!
5th Gear Member
Joined: Mar 2007
Posts: 2,623
From:
RE: Pedal to floor= bad performance? please diagnose
Shelby put a 4150, a high rise manifold and headers on a 289 Hi-Po engine, an engine already built for more than average horsepower output. That engine was not a 'C' code or an 'A' code. An overcarbureted car blows gas out the tailpipe.
Jim
Jim
2nd Gear Member
Joined: Mar 2006
Posts: 490
From:
RE: Pedal to floor= bad performance? please diagnose
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.
I agree with the suggesion that the problem is with the carb. It may need something as simple as adjustments or it may need a rebuild. I would follow this path before replacing it.
Soaring - there is a concours forum at Vintage Mustang Forum that you may enjoy. They really get into how to replace paint marking codes place by Ford during assembly. Those boys and girls have the only real classic mustangs.
http://forums.vintage-mustang.com/showforum.php?fid/14/
3rd Gear Member
Joined: Nov 2006
Posts: 702
From:
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.
I ♥ Acer
Joined: Dec 2002
Posts: 148
From: USA
RE: Pedal to floor= bad performance? please diagnose
ORIGINAL: JamesW
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.
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.
5th Gear Member
Joined: Sep 2006
Posts: 3,302
From: Northernish Eastish Central Texas
RE: Pedal to floor= bad performance? please diagnose
ORIGINAL: Hornblower
James, you have a very nice restomod, but it is no longer a classic Mustang. I believe what Soaring is saying is that there is a point in time when a classic mustang is no longer a classic mustang when you put EFI engines, digital gaugepods and such in them. Sure the shell may still resemble a classic mustang, but it sure isn't a classic mustang. Again, you have a really nice restomod, but it is no longer a classic Mustang. Face it.
ORIGINAL: JamesW
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.
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.
Colt,
Just who in the hell do you think you are addressing me specifically and telling me what my car is or is not? You have no idea who I am, or what my car consists of. I am appalled that someone would go out of their way to voice such an asinine and stupid opinion, and infer that someone else's car is or is not anything. This tread has nothing to do with my car, yet you seemed to think you have the right to insult me and my vehicle. Perhaps you would feel better if I just took a personal attack on you and your vehicle.
Glen, I blame you for this idiotic environment you have forstered where people think they can insult others rather than address the topics at hand.
I, nor ANYONE ELSE on this board could give a rat's *** about your opinion of my car.
Thread Starter
2nd Gear Member
Joined: May 2007
Posts: 159
From:
RE: Pedal to floor= bad performance? please diagnose
Admin please close this thread due to childishness...JamesW Please forgive me for starting this thread in the first place, no one has any right to post like that, and should be warned when flaming and bashing begins. I'm sending this thread to Amanda to take a look at, As a moderator, I expect better from Soaring ( Or anyone else who monitors the Classic message boards ).
