1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck
Sponsored by:
Sponsored by: Moser

78 f150 4x4 351/400m backfiring threw carb

Thread Tools
 
Search this Thread
 
  #16  
Old 05-31-2012, 11:57 AM
BuiltFordTough100's Avatar
BuiltFordTough100
BuiltFordTough100 is offline
Freshman User
Thread Starter
Join Date: May 2012
Posts: 35
Likes: 0
Received 0 Likes on 0 Posts
okayy man will do, ima get a compression gauge from work today.
 
  #17  
Old 05-31-2012, 03:23 PM
BuiltFordTough100's Avatar
BuiltFordTough100
BuiltFordTough100 is offline
Freshman User
Thread Starter
Join Date: May 2012
Posts: 35
Likes: 0
Received 0 Likes on 0 Posts
is there any way with me puttting exhaust on the truck causeing it to run lean by putting back pressure on the motor???
 
  #18  
Old 05-31-2012, 05:54 PM
BuiltFordTough100's Avatar
BuiltFordTough100
BuiltFordTough100 is offline
Freshman User
Thread Starter
Join Date: May 2012
Posts: 35
Likes: 0
Received 0 Likes on 0 Posts
okay, compression is 130 to 145 on all of them, i think its the carborater tho, the two screws on the front of the carb witch are the fuel mixture screws i think i backed out 1 1/4 of a turn and idled it down and now it dont back firre at all but it dont sound as mean at idle anymore it idles smooth know, think theres trash in there causeing it to run lean at that setting?
 
  #19  
Old 05-31-2012, 08:37 PM
jacks61ford's Avatar
jacks61ford
jacks61ford is offline
Senior User
Join Date: Aug 2008
Location: pahrump nv
Posts: 484
Likes: 0
Received 0 Likes on 0 Posts
if your backed them out you richened up the mix I thought it sounded like a lean pop the mean sound was probably a starving motor lol if it's smooth it's right
 
  #20  
Old 05-31-2012, 10:34 PM
BuiltFordTough100's Avatar
BuiltFordTough100
BuiltFordTough100 is offline
Freshman User
Thread Starter
Join Date: May 2012
Posts: 35
Likes: 0
Received 0 Likes on 0 Posts
okayy then man, it didnt do it till i started finding rust and got exhaust put on the truck then it started to back fire threw the carb
 
  #21  
Old 06-01-2012, 12:15 AM
jacks61ford's Avatar
jacks61ford
jacks61ford is offline
Senior User
Join Date: Aug 2008
Location: pahrump nv
Posts: 484
Likes: 0
Received 0 Likes on 0 Posts
well that's weird make sure the carb is clean inside if it is then you should be fine
 
  #22  
Old 06-01-2012, 06:36 AM
BuiltFordTough100's Avatar
BuiltFordTough100
BuiltFordTough100 is offline
Freshman User
Thread Starter
Join Date: May 2012
Posts: 35
Likes: 0
Received 0 Likes on 0 Posts
yeahh, im thinking it needs to be clean but i aint never been in one or adjusted one before so it will be a learning excperiene for me
 
  #23  
Old 06-01-2012, 06:48 AM
meborder's Avatar
meborder
meborder is online now
Moderator
Join Date: Jul 2011
Location: Sioux Falls Area
Posts: 6,171
Received 365 Likes on 260 Posts
some might scoff at this, but i've done it with pretty good success.

run a full bottle of seafoam through a half tank of gas.

if it is just varnish, the seafoam should clean it out pretty well. if it is debris, you'll have to clean it the hard way, but seafoam is pretty good stuff, but it will fix a dirty fuel system problem about 7/10 of the time

i do it as a matter of maintence on all of my vehicles,
 
  #24  
Old 06-01-2012, 12:22 PM
BuiltFordTough100's Avatar
BuiltFordTough100
BuiltFordTough100 is offline
Freshman User
Thread Starter
Join Date: May 2012
Posts: 35
Likes: 0
Received 0 Likes on 0 Posts
okayy man thanks ill try that first, ive never been in a carb on a vehicale and dont want to if i dont gotta
 
  #25  
Old 06-01-2012, 01:43 PM
jacks61ford's Avatar
jacks61ford
jacks61ford is offline
Senior User
Join Date: Aug 2008
Location: pahrump nv
Posts: 484
Likes: 0
Received 0 Likes on 0 Posts
if its running good then leave it and try and see if it runs good through all driving ranges
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
yewdall
335 Series- 5.8/351M, 6.6/400, 351 Cleveland
3
07-05-2013 12:11 PM
08gasurveyor
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
41
01-20-2012 09:05 AM
mac10guy
1973 - 1979 F-100 & Larger F-Series Trucks
9
03-07-2010 09:01 PM
Reed_50
1973 - 1979 F-100 & Larger F-Series Trucks
17
10-13-2009 09:50 PM
mike460
Performance & General Engine Building
4
05-13-2002 07:35 PM



Quick Reply: 78 f150 4x4 351/400m backfiring threw carb



All times are GMT -5. The time now is 07:04 PM.