Go Back   MustangForums.com > Ford Mustang Tech > 5.0L (1979-1995) Mustang > Speed Density/Carb/SSP section
Sign in using an external account
Register Forgot Password?
Search


Speed Density/Carb/SSP section This section is for the Speed Density or Carb vehicles, as well as Special Service Package 'Stangs

Welcome to Mustang Forums!
Welcome to Mustang Forums.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


problem with my 84?

Reply
 
 
 
 
Thread Tools Search this Thread
Old 06-23-2013, 06:32 PM   #1
Noob X
 
Join Date: Apr 2013
Vehicle: 1984 1/2 Ford GT350
Location: Ct
Posts: 29
Default problem with my 84?

Wassup guys I have a 84 1/2 GT350 With a 302 v8 carb the issue I'm having is when I give it throttle it cuts off but idle and turns on fine then when I'm driving it and shift into the next gear it does it again the car has a holley 600 carb flow master headers with full exhaust just put in ne plugs to any help is appreciated thanks fellas
This ad is not displayed to registered or logged-in members.
Register your free account today and become a member on Mustang Forums!
__________________
Noob X is offline   Reply With Quote
Old 06-23-2013, 06:43 PM   #2
mattdel
6th Gear Member
 
mattdel's Avatar
 
Join Date: Nov 2006
Vehicle: 1986 LX, 87 GT Hatch, 89 GT Vert
Location: Spfld, MA
Posts: 9,240
Send a message via AIM to mattdel
Default

Carb issues, I'd say. Accelerator pump maybe.
__________________
mattdel is offline   Reply With Quote
Old 06-23-2013, 07:01 PM   #3
Noob X
 
Join Date: Apr 2013
Vehicle: 1984 1/2 Ford GT350
Location: Ct
Posts: 29
Default

How do I go about checking that issue?
__________________
Noob X is offline   Reply With Quote
Old 06-23-2013, 07:38 PM   #4
mattdel
6th Gear Member
 
mattdel's Avatar
 
Join Date: Nov 2006
Vehicle: 1986 LX, 87 GT Hatch, 89 GT Vert
Location: Spfld, MA
Posts: 9,240
Send a message via AIM to mattdel
Default

That I'm not sure of. I'm a bit too young to be well versed on carb repair/diagnosis. I understand how they work but finding the problem is another animal.
__________________
mattdel is offline   Reply With Quote
Old 06-23-2013, 08:07 PM   #5
DK Pony
3rd Gear Member
 
DK Pony's Avatar
 
Join Date: Aug 2012
Vehicle: 2013 V6 Convertible
Location: Close Enough
Posts: 977
Default

Is this a new problem? New (to you) car? Does it die or just stumble?
There are several things it could be. I personally hate Holley carbs but I have worked on many of them over the years.
These carbs also have power valves that can cause problems if the vehicle has ever backfired through the carb.
Also is your ignition in good shape? Coil? Wires? Vac lines?
Sorry but we need a lot more info.
__________________


Member 89
Eibach Anti-Sway Kit, FRPP Bullitt Springs, Koni STR.T
DK Pony is offline   Reply With Quote
Old 06-23-2013, 08:28 PM   #6
Noob X
 
Join Date: Apr 2013
Vehicle: 1984 1/2 Ford GT350
Location: Ct
Posts: 29
Default

Since I got it its been doing that since I got it I didn't put the carb it came like that I have the stock one but haven't put it back and was eliminating the emissions stuff but even before I did that and put the headers still did it also been trying to adjust the clutch just had no luck
__________________
Noob X is offline   Reply With Quote
Old 06-23-2013, 08:32 PM   #7
Noob X
 
Join Date: Apr 2013
Vehicle: 1984 1/2 Ford GT350
Location: Ct
Posts: 29
Default

It cuts the gas off and loses power for a second then kicks back on like if I clutch kicked
__________________
Noob X is offline   Reply With Quote
Old 06-23-2013, 08:37 PM   #8
DK Pony
3rd Gear Member
 
DK Pony's Avatar
 
Join Date: Aug 2012
Vehicle: 2013 V6 Convertible
Location: Close Enough
Posts: 977
Default

So does it actually stall out (you have to restart it) or is it just a bad stumble off the line?
Does this happen only when you get on it or just normal acceleration?
There are several youtube videos for basic Holley carb adjustments out there. There are several adjustments that can be made to address these problems but you need to make sure that vac lines, distributor, coil, plugs and wires and timing are good too.
You said you put headers on? That opens up the exhaust and can cause a lean condition. You may need to rejet or at least adjust the air/fuel ratio.
__________________


Member 89
Eibach Anti-Sway Kit, FRPP Bullitt Springs, Koni STR.T
DK Pony is offline   Reply With Quote
Old 06-23-2013, 08:42 PM   #9
DK Pony
3rd Gear Member
 
DK Pony's Avatar
 
Join Date: Aug 2012
Vehicle: 2013 V6 Convertible
Location: Close Enough
Posts: 977
Default

Quote:
Originally Posted by Noob X View Post
It cuts the gas off and loses power for a second then kicks back on like if I clutch kicked
You snuck that one in on me while I was typing..lol

So that is a stumble. Not a stall.
As I said there are several adjustments on the Holley that can address the problems you are having. Since you don't know if the PO set the carb up correctly for the car you should probably start from the beginning on the carb adjustments.
Here is one I found in just a few seconds on youtube,
__________________


Member 89
Eibach Anti-Sway Kit, FRPP Bullitt Springs, Koni STR.T
DK Pony is offline   Reply With Quote
Old 06-23-2013, 08:46 PM   #10
Noob X
 
Join Date: Apr 2013
Vehicle: 1984 1/2 Ford GT350
Location: Ct
Posts: 29
Default

Its when normal acceleration it stumbles but even in idle if I rev it still does the same thing ill make a video on it tomorrow and post it here and yea some vac lines are out cause there's no plugs on the carb we checked them all to see if they did anything but nothing
__________________
Noob X is offline   Reply With Quote
Old 06-23-2013, 08:51 PM   #11
DK Pony
3rd Gear Member
 
DK Pony's Avatar
 
Join Date: Aug 2012
Vehicle: 2013 V6 Convertible
Location: Close Enough
Posts: 977
Default

make sure there are no ports on the carb that are left open. If it has a vac port that is not used make sure it is capped. Some of them won't have vac at idle but as the throttle plates move past certain spots in the venturi they will open.

OK so it sounds like you are saying it has an off idle hesitation.
1st make sure all the vac lines are good.
2nd make sure all ports on the carb have something on them. If it isn't used it has to be capped.
3rd set the carb to a basic startup setting. (does it have an electric choke?) If yes make sure the choke is working properly too
4th fine tune the carb
__________________


Member 89
Eibach Anti-Sway Kit, FRPP Bullitt Springs, Koni STR.T

Last edited by DK Pony; 06-23-2013 at 08:57 PM.
DK Pony is offline   Reply With Quote
Old 06-23-2013, 09:07 PM   #12
Noob X
 
Join Date: Apr 2013
Vehicle: 1984 1/2 Ford GT350
Location: Ct
Posts: 29
Default

Quote:
Originally Posted by DK Pony View Post
make sure there are no ports on the carb that are left open. If it has a vac port that is not used make sure it is capped. Some of them won't have vac at idle but as the throttle plates move past certain spots in the venturi they will open.

OK so it sounds like you are saying it has an off idle hesitation.
1st make sure all the vac lines are good.
2nd make sure all ports on the carb have something on them. If it isn't used it has to be capped.
3rd set the carb to a basic startup setting. (does it have an electric choke?) If yes make sure the choke is working properly too
4th fine tune the carb
Thanks a lot man tomorrow I'm going to check the nosel size I watched the holley 600 vid and said that if its missfiring when accelerationg at low rpm to upgrade the nosel
__________________
Noob X is offline   Reply With Quote
Old 06-23-2013, 09:10 PM   #13
Noob X
 
Join Date: Apr 2013
Vehicle: 1984 1/2 Ford GT350
Location: Ct
Posts: 29
Default

Gonna take it apart tomorrow hopefully its that thanks again for the info was breaking my head trying to figure it out
__________________
Noob X is offline   Reply With Quote
Old 06-23-2013, 09:36 PM   #14
DK Pony
3rd Gear Member
 
DK Pony's Avatar
 
Join Date: Aug 2012
Vehicle: 2013 V6 Convertible
Location: Close Enough
Posts: 977
Default

No prob man. Keep us posted and good luck.
__________________


Member 89
Eibach Anti-Sway Kit, FRPP Bullitt Springs, Koni STR.T
DK Pony is offline   Reply With Quote
Old 06-23-2013, 09:38 PM   #15
Noob X
 
Join Date: Apr 2013
Vehicle: 1984 1/2 Ford GT350
Location: Ct
Posts: 29
Default

Thanks deffinetly will do
__________________
Noob X is offline   Reply With Quote
Old 06-25-2013, 07:03 PM   #16
Noob X
 
Join Date: Apr 2013
Vehicle: 1984 1/2 Ford GT350
Location: Ct
Posts: 29
Default

Took a look at the carb jet its only a 31 same as the oem carb haven't gotten the chance to adjust the accelerator pump but here's a quick sound clip
__________________
Noob X is offline   Reply With Quote
Old 06-26-2013, 04:46 PM   #17
mongolchuck
2nd Gear Member
 
Join Date: Feb 2007
Vehicle: 1991 LX Convertible
Location: IA
Posts: 151
Default

I bought the same carb for my 85 and had the same problem. I had to put much smaller jets in (i was at about 5000ft). I also put in a more aggressive accelerator pump cam. It takes time to tune it but its not too bad.
mongolchuck is offline   Reply With Quote
Old 06-27-2013, 06:35 PM   #18
Noob X
 
Join Date: Apr 2013
Vehicle: 1984 1/2 Ford GT350
Location: Ct
Posts: 29
Default

Quote:
Originally Posted by mongolchuck View Post
I bought the same carb for my 85 and had the same problem. I had to put much smaller jets in (i was at about 5000ft). I also put in a more aggressive accelerator pump cam. It takes time to tune it but its not too bad.
It had a 31 nosel I went up to a 37 then to a 40 and still the same was a bit better with the 37 but still bad idk what to do anymore lol
__________________

Last edited by Noob X; 06-27-2013 at 06:55 PM.
Noob X is offline   Reply With Quote
Old 06-28-2013, 08:46 PM   #19
tinman
5th Gear Member
 
Join Date: Aug 2004
Vehicle: 84 Mustang, 59 Ranchero
Location: Arizona
Posts: 4,086
Default

Check the fuel level in the float bowls......
Thats usually a good place to start when trouble -shooting a Holley carb......
__________________
GOOD,FAST, CHEAP-----------YOU CAN ONLY GET 2 OUT OF 3!!!!!!!!!!!!!!!!
tinman is offline   Reply With Quote
Old 06-30-2013, 01:33 PM   #20
Noob X
 
Join Date: Apr 2013
Vehicle: 1984 1/2 Ford GT350
Location: Ct
Posts: 29
Default

It ended up being the egr spacer the bottom gasket had went and it had a leak eliminated all of that crap now she doesn't do it any more
__________________
Noob X is offline   Reply With Quote
Old 06-30-2013, 01:33 PM
MustangForums
Ford Mustang




Paid Advertisement

 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Advertising

Featured Sponsors
Vendor Directory
New Sponsors
All times are GMT -5. The time now is 02:01 AM.

© Internet Brands, Inc.


This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company
Emails Backup