5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

1991 5.0 ignition problems

Thread Tools
 
Search this Thread
 
Old 12-17-2015, 07:56 PM
  #1  
91StangOwner
Thread Starter
 
91StangOwner's Avatar
 
Join Date: Nov 2014
Location: florida
Posts: 8
Default 1991 5.0 ignition problems

So the car will start on cold starts. It does have some idle problems but I included pictures of the setup. The main thing is once you drive some where and shut it off, it wont start back up unless you unplug the fuel relay under the seat. When you do that it starts and dies. Then plug it back in and it starts up to where I can drive with the gas pedal 1/4 of the way down and all the way down. I did replace the starter a few weeks ago to a smaller more performance one off american muscle. New distributor cap and rotor. It does have msd ignition and all plugs on distributor are right just all one move. You do hear the starter and fuel pump working. Fuel psi is around 40. This is a mess describing it. Just trying to give all possible info. Any ideas?

























Last edited by 91StangOwner; 12-17-2015 at 08:07 PM.
91StangOwner is offline  
Old 12-18-2015, 07:53 AM
  #2  
88 orangepeel notch
6th Gear Member
 
88 orangepeel notch's Avatar
 
Join Date: Mar 2010
Location: Wisconsin
Posts: 5,061
Default

Have you pulled codes yet ? That's where I'd start and see if that points you in the right direction. Sounds like you have a can of worms there, hopefully we can help you get them sorted out.
88 orangepeel notch is offline  
Old 01-04-2016, 08:30 AM
  #3  
Richard1916
 
Richard1916's Avatar
 
Join Date: Jan 2016
Location: missouri
Posts: 27
Default

sounds like it may have been running so rich it got the plugs soaked thats why it will start after unplugging relay. now you will have to find out why so rich, once fixed change plugs again .also the coil connection looks awful corroded it will eventually cause you a problem
Richard1916 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
MustangForums Editor
Mustang News, Concepts, Rumors & Discussion
1
10-23-2015 11:58 AM
fullmonte60
5.0L (1979-1995) Mustang
2
10-05-2015 11:29 AM
Matt's 95 Stang
5.0L (1979-1995) Mustang
2
10-05-2015 07:16 AM
mrappe
V6 (1994-2004) Mustangs
0
09-26-2015 10:16 AM
schecterplayer
5.0L (1979-1995) Mustang
3
09-23-2015 08:38 AM



Quick Reply: 1991 5.0 ignition problems



All times are GMT -5. The time now is 08:54 AM.