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Unread 02-02-2013, 09:04 PM   #16
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 13,702
Sorry. I am on my cell and can't post it. Search the forum for a thread "how to check fault codas" and if you you can't find it I will post it tomorrow.

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Unread 02-02-2013, 10:00 PM   #17
smithj156
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1993 YJ Wrangler 
 
Join Date: Jan 2013
Location: pass chirstian, MS
Posts: 13
so i got a code 52 o2 sensor rich but the check engine light never came one but with the key trick it came on
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Unread 02-02-2013, 10:08 PM   #18
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 13,702
Exactly like I said. Obd I will not always light the cel.
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Unread 02-02-2013, 10:14 PM   #19
smithj156
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1993 YJ Wrangler 
 
Join Date: Jan 2013
Location: pass chirstian, MS
Posts: 13
thanks going to get a new one in the am that should help with mpg big time
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Unread 02-03-2013, 09:05 AM   #20
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 13,702
Rich is not a bad 02 sensor. It is usually high fuel pressure or a temp sensor issue.
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Unread 02-03-2013, 09:59 AM   #21
kenh
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1989 YJ Wrangler 
 
Join Date: Sep 2011
Location: Billings, MT
Posts: 81
Not to thread jack, but I filled up yesterday and got 8 mpg, ugh. Time to check my codes also I guess.
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Unread 02-03-2013, 02:08 PM   #22
smithj156
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1993 YJ Wrangler 
 
Join Date: Jan 2013
Location: pass chirstian, MS
Posts: 13
well 2 wires were broke off
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Unread 02-03-2013, 03:00 PM   #23
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 13,702
Broke off! Well it makes it easy to diagnose. Pull the battery after you put the new one in to reset the ecu.
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Unread 02-03-2013, 03:21 PM   #24
smithj156
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1993 YJ Wrangler 
 
Join Date: Jan 2013
Location: pass chirstian, MS
Posts: 13
ya it looked almost new too but with 2 broke wires lucky it didnt arch out and fry ecm
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Unread 02-03-2013, 03:45 PM   #25
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 13,702
The ecm its designed to take a direct short on any of its power supplies. The only thing power related to kill it is disconnecting and reconnecting battery power when you have it running and loaded with things turned on. That is the cause of most of the blown caps in the ecu that people experience.
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