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Unread 04-19-2010, 03:46 PM   #1
mattice
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Join Date: Apr 2010
Location: richmond
Posts: 1
94 wrangler:rough idle, now no spark

I have a 94 yj 4 cylinder and in the begining of my problems it was having a rough idle and I would have to give it gas until it warmed up but after it warmed up it would cut off and then would not start back up right away. The codes that it put out were: 12, 33, 23, 24. I have replaced or checked the following: o2 sensor, fuel pressure regulator, map sesnor, mat sensor, throttle position sensor. Not sure what to check out next, thinking the crankshaft sensor or the ecm. Thanks for the help.

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Unread 04-19-2010, 04:22 PM   #2
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,416
First the basic no start question: Does the fuel pump cycle on and then off when you turn the ignition key to on? When you say you checked, what did you replace and what did you check and how? Do a battery disconnect for a minute(10 seconds is usually long enough but just to make sure) and then try to start it again. Recheck the fault codes. If you had a rough idle but it ran fine after it warmed up it is usually 1 of 2 sensors; the TPS or the engine temp sensor in the front of the block near the thermostat.
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Unread 04-19-2010, 04:51 PM   #3
idaholtby
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1991 YJ Wrangler 
 
Join Date: Apr 2008
Location: Meridian, Idaho
Posts: 2,554
Quote:
Originally Posted by mattice View Post
I have a 94 yj 4 cylinder and in the beginning of my problems it was having a rough idle and I would have to give it gas until it warmed up but after it warmed up it would cut off and then would not start back up right away. The codes that it put out were: 12, 33, 23, 24. I have replaced or checked the following: o2 sensor, fuel pressure regulator, map sensor, mat sensor, throttle position sensor. Not sure what to check out next, thinking the crankshaft sensor or the ecm. Thanks for the help.
With a 23, and 24 code stored.... this would suggest that your CTS(coolant temp sensor for the ecm) sensor is bad. It is located on the thermostat housing. Your ecm is flagging this sensor, so I would start from there.
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no spark , rough idle

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