Rough Running 1968 289 - MustangForums.com



Classic Mustangs (Tech) Technical discussions about the Mustangs of yester-year.

Reply
 
 
 
Thread Tools Search this Thread
Old 06-05-2010, 11:06 PM   #1
marks68mustang
Thread Starter
 
Join Date: Jun 2010
Location: new jersey
Posts: 2
Default Rough Running 1968 289

I am totally frustrated with my 68 convertible. The engine starts fine and while cold runs smooth. Once warmed up I can't get it to run right. It sputters and misses and I have to keep pumping the gas to get it to run down the road. I've replaced the carb, coil, points, fuel pump, fuel filters, and still the same problem. I checked the timing and its at 6 BTDC.


Any thoughts. Thanks.

Mark
marks68mustang is offline   Reply With Quote
Old 06-06-2010, 02:13 AM   #2
67mustang302
6th Gear Member
 
Join Date: Apr 2007
Location: California
Posts: 10,468
Default

6? Seriously? Set it to 10-12 at least. And has the carb been tuned at all? Pulled any plugs? What do they look like? Reset the timing and see what it does, if it still runs like crap post pics of the plugs.
67mustang302 is offline   Reply With Quote
Old 06-07-2010, 09:50 AM   #3
warlord99
 
Join Date: Apr 2010
Location: florida
Posts: 21
Default

not sure about the timing but dirty or old plugs will kill your spark, basic troube shooting, start small work up to big. and never give up
warlord99 is offline   Reply With Quote
Old 06-07-2010, 09:58 AM   #4
MBDiagMan
3rd Gear Member
 
MBDiagMan's Avatar
 
Join Date: Aug 2006
Location: North East Texas on the Red River
Posts: 886
Default

Tell us more about the car. Is it stone stock, still having a points ignition system?
MBDiagMan is offline   Reply With Quote
Old 06-07-2010, 10:32 AM   #5
stephen.osborne1
2nd Gear Member
 
stephen.osborne1's Avatar
 
Join Date: Nov 2009
Location: Washington
Posts: 347
Default

Sounds like a choke problem, but if he replaced the carb, maybe not... have you ever replaced the vacuum advance on the dizzy? get the timing right too, like said above.
stephen.osborne1 is offline   Reply With Quote
Old 06-12-2010, 06:49 PM   #6
marks68mustang
Thread Starter
 
Join Date: Jun 2010
Location: new jersey
Posts: 2
Default rough running 289

New vacuum advance, carb tuned. Only runs rough when warmed up. Could it be a worn out timing chain?
marks68mustang is offline   Reply With Quote
Old 06-13-2010, 03:19 AM   #7
67mustang302
6th Gear Member
 
Join Date: Apr 2007
Location: California
Posts: 10,468
Default

Are you sure it's tuned? Are the plugs getting sooty after it's warmed up?
67mustang302 is offline   Reply With Quote
Old 06-14-2010, 11:10 AM   #8
MBDiagMan
3rd Gear Member
 
MBDiagMan's Avatar
 
Join Date: Aug 2006
Location: North East Texas on the Red River
Posts: 886
Default

We want to help, but need more information.
MBDiagMan is offline   Reply With Quote
Old 06-14-2010, 12:38 PM   #9
Stepman
4th Gear Member
 
Join Date: Mar 2004
Location: Az
Posts: 1,051
Default

4 degrees of timing isn't going to make that big of a difference. Sounds like old plug wires. A little more info would be nice though. When does it miss and sputter? Do you see any smoke?
Stepman is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Spark Plug Change 2007StangV6 2005-2014 Mustangs 30 01-28-2016 07:09 PM
Switching from 3.89 to 3.00 gears... musnicki Classic Mustang General Discussion 8 09-23-2015 08:11 AM
Gas building up in throttle body TorinoCobra070 SVT Forums 8 09-18-2015 11:34 AM
ford 289 ryland Mustang News, Concepts, Rumors & Discussion 0 09-13-2015 01:35 PM
How much is my mustang worth? Brian Emmer Classic Mustangs (Tech) 11 09-09-2015 03:50 PM


Tags
1968, 289, 68, carburetor, convertible, corners, ford, gear, mustang, rough, running, runs, sale, sputtering, texas

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

All times are GMT -5. The time now is 01:37 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.