Go Back   tbirdforum.com > Tech Forums > Mechanical and Engine Tuning and Mods

Mechanical and Engine Tuning and Mods Found a way to add horsepower by tuning a few parts? Have some questions about Tuning your own engine? Well post them here and learn from other members.

390 has miss at all throttle speeds

This is a discussion on 390 has miss at all throttle speeds within the Mechanical and Engine Tuning and Mods forums, part of the Tech Forums category; Have newly rebuilt 390 with 2000 miles on it. Has new plugs, wires, points, condenser, vacuum advance. Timing, dwell, points, ...

Reply
 
LinkBack Thread Tools
  #1 (permalink)   IP: 98.231.39.75
Old 12-30-2014, 07:42 AM
 
Join Date: Jan 2004
Location: Jacksonville, Florida
Age: 76
Posts: 25
Rep Power: 0
kapejo is on a distinguished road
Garage
390 has miss at all throttle speeds

Have newly rebuilt 390 with 2000 miles on it. Has new plugs, wires, points, condenser, vacuum advance. Timing, dwell, points, and plugs are all within spec. Cap and rotor appear to be in excellent condition. Checked running motor at night .... no fireworks.
Engine has a miss at idle and throughout throttle range. It has poor acceleration. Any thoughts on to proceed or troubleshoot?

Thanks,
John
Reply With Quote
  #2 (permalink)   IP: 108.35.51.254
Old 12-30-2014, 10:26 AM
 
Join Date: Dec 2002
Location: NJ
Age: 77
Posts: 431
Rep Power: 65
boaterbob is on a distinguished road
Can you bring motor back to rebuilder? That could be various things. Is dizzy put in correct not 180 degrees out? I would advance timing and see how it reacts. wires on in correct locations? Vacuum leak?
Reply With Quote
  #3 (permalink)   IP: 108.35.51.254
Old 12-30-2014, 11:08 AM
 
Join Date: Dec 2002
Location: NJ
Age: 77
Posts: 431
Rep Power: 65
boaterbob is on a distinguished road
Also what is condition of Carb??
Reply With Quote
  #4 (permalink)   IP: 69.34.132.209
Old 12-30-2014, 11:52 AM
 
Join Date: Oct 2011
Location: Ontario, Canada
Posts: 174
Rep Power: 30
Terry64HT is on a distinguished road
Make sure the no. 6 plug wire is between nos. 7 and 8 on the wire loom. 7 and 8 need to be kept as far as part as possible to avoid missfires.

Terry
64HT
Reply With Quote
  #5 (permalink)   IP: 98.231.39.75
Old 01-06-2015, 05:47 PM
 
Join Date: Jan 2004
Location: Jacksonville, Florida
Age: 76
Posts: 25
Rep Power: 0
kapejo is on a distinguished road
Garage
390 Misfire

Thanks Terry....your post resolved my issue.

John
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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 On
Pingbacks are On
Refbacks are On


All times are GMT -4. The time now is 09:16 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.3.0
Garage vBulletin Plugins by Drive Thru Online, Inc.