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.

86 gt only get 100 miles on a full tank and fouling new plugs after 150 miles HELP

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Old Jan 6, 2011 | 12:46 PM
  #1  
86gt5.0ttops's Avatar
86gt5.0ttops
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Default 86 gt only get 100 miles on a full tank and fouling new plugs after 150 miles HELP

okay i have an 86 5.0 gt bone stock 192 k
been sitting a year maybe idles rough i go fill it up exactly 100 miles later im bone dry and then fifty miles later the plugs are fouled i dont know what to think any ideas?
Old Jan 6, 2011 | 01:07 PM
  #2  
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sounds like your injectors are sticking open. pull them out and clean them up real good. ALso, replace your O2 sensors, they are probably as old as the car is
Old Jan 6, 2011 | 01:38 PM
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Five0hFox
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I'd check your oil. When I got my fox it had an injector stuck open and the oil smelled like it had gas in it.
Old Jan 6, 2011 | 04:20 PM
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86gt5.0ttops
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Default fuel

so i do i find out which is injector is sticking
Old Jan 6, 2011 | 05:59 PM
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you don't start throwing parts at it just yet, CONFIRM THE ISSUE, CHECK FUEL pressure first with a gauge, if a injector is hung open, leakdown on the gauge will confirm it, FURTHERMORE YOU CAN KILL TWO BIRDS WITH ONE STONE BY TESTING FUEL PRESSURE you can see if it has excessive pressure or a bad fuel pressure regulator....a rupture diaphram could be the cause too, pull the line to the regulator and make sure it isn't wet with fuel, do these things first to narrow the prob to an area
Old Jan 6, 2011 | 10:44 PM
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Originally Posted by mjr46
you don't start throwing parts at it just yet, CONFIRM THE ISSUE, CHECK FUEL pressure first with a gauge, if a injector is hung open, leakdown on the gauge will confirm it, FURTHERMORE YOU CAN KILL TWO BIRDS WITH ONE STONE BY TESTING FUEL PRESSURE you can see if it has excessive pressure or a bad fuel pressure regulator....a rupture diaphram could be the cause too, pull the line to the regulator and make sure it isn't wet with fuel, do these things first to narrow the prob to an area
+1 Sound advice there
Old Jan 8, 2011 | 08:56 AM
  #7  
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When it sat for a year, did it have fuel stabilizer throughout the fuel system?
Old Jan 8, 2011 | 09:18 AM
  #8  
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Originally Posted by 86gt5.0ttops
okay i have an 86 5.0 gt bone stock 192 k
been sitting a year maybe idles rough i go fill it up exactly 100 miles later im bone dry and then fifty miles later the plugs are fouled i dont know what to think any ideas?
Originally Posted by 86gt5.0ttops
so i do i find out which is injector is sticking
You need to slow down, learn what punctuation is and proof read.
I hate to be a grammar ****, but you're not texting one of your friends... you're on a forum.
Your first two post are abortions of the English language... nice first impression.
Old Jan 9, 2011 | 09:25 AM
  #9  
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capri debris
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Thank you Capri debris, He has been dealt with

Nice 3rd post... definitely tops your first two.

Last edited by mjr46; Jan 9, 2011 at 09:44 PM.
Old Jan 9, 2011 | 01:26 PM
  #10  
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Jfsram
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Yes, trying to help someone out on a forum is easier when the question is typed properly.
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