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Unread 08-11-2011, 11:39 AM   #1
mbgencon
Registered User
1994 YJ Wrangler 
 
Join Date: Aug 2011
Location: Myrtle Beach, SC
Posts: 2
YJ Engine Issue

This is a strange problem that I can't seem to fix. When I am driving for about 45min to an hour, if i give the engine any more than 1/4 throttle it will hesitate, sputter, backfire, etc. It does not do this under the time stated above. If I turn the engine off for a few seconds then turn it back on, it runs fine for about 10-15min then it acts up all over again. I have changed the fuel filter, throttle position sensor, cap & rotor, plugs, plug wires, and O2 sensor.

Any insight anyone may have is appreciated.

1994 YJ
2.5L

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Unread 08-11-2011, 11:57 AM   #2
Xpress
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1989 YJ Wrangler 
 
Join Date: Dec 2010
Location: The Great Big Box, California
Posts: 5,807
Could be a few things... Might want to start with your fuel pump...
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Unread 08-11-2011, 12:10 PM   #3
Matt24138
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1993 YJ Wrangler 
 
Join Date: Apr 2010
Location: Bethany Beach, Delaware
Posts: 259
Vacuum leaks are also known to open up and close with heat. Check when the issue occurs.
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Unread 08-11-2011, 12:34 PM   #4
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,425
Welcome to the forum. Start by checking for fault codes:
Read this post:
http://www.jeepforum.com/forum/f12/1...issue-1251610/
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Unread 08-12-2011, 05:31 PM   #5
mbgencon
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1994 YJ Wrangler 
 
Join Date: Aug 2011
Location: Myrtle Beach, SC
Posts: 2
Thanks guys, I'll try those.
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Unread 08-12-2011, 05:38 PM   #6
Darold
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1988 YJ Wrangler 
 
Join Date: May 2007
Location: Moscow , Maine
Posts: 67
Quote:
Originally Posted by mbgencon View Post
This is a strange problem that I can't seem to fix. When I am driving for about 45min to an hour, if i give the engine any more than 1/4 throttle it will hesitate, sputter, backfire, etc. It does not do this under the time stated above. If I turn the engine off for a few seconds then turn it back on, it runs fine for about 10-15min then it acts up all over again. I have changed the fuel filter, throttle position sensor, cap & rotor, plugs, plug wires, and O2 sensor.

Any insight anyone may have is appreciated.

1994 YJ
2.5L
Check sparkplug gaps, set to .035.
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