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Unread 11-11-2013, 10:26 AM   #16
Schmuds
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1995 YJ Wrangler 
 
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Location: Illinois
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yes i replaced the temp sensor near the tstat. i have not checked the fuel pressure yet. ill look at that, hopefully tonight.

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Unread 11-12-2013, 06:04 AM   #17
vadslram
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Thinking about the systems. After about 10 minutes of running your system should be switching from an open loop enriched to a closed loop.

Even if the sensors are working perfectly maybe the connections aren't. Maybe it is running a little lean and the switch over happens before the engine is quite warm enough to handle the lean mixture. Maybe the idle control valve is a little sticky and not switching smoothly. Maybe the injectors aren't getting the right pressure or are a little dirty and throwing a bad spray that is tougher to ignite in a not fully warmed up engine.
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Unread 11-12-2013, 06:23 AM   #18
Que89YJ
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10 minutes is about the length of time it takes to go into closed loop. I wonder if it is kicking out and trying to go back into closed loop. That would make it about 10 minutes. After you check the fuel pressure try disconnecting the O2 sensor and run it. It will run rich but it should stop the computer from trying to go into closed loop. Good call vadslram!
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Unread 11-13-2013, 08:10 AM   #19
laybackman
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What if this is just a case of the ignition coil heating up in 10 minutes and the field collapses so you are losing a good spark?
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Unread 11-14-2013, 08:31 AM   #20
Schmuds
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so i stopped to think the other day of when i started having the problems. and it all started when i changed the crankshaft position sensor becuase it was not starting. so i started reading more on the forum and found a couple of threads that stated there is supposed to be a circular paper gasket on the tip of the crankshaft position sensor, and could not remember if i put one on it. i didnt remember this little part being included with the sensor i bought. so i started looking at the autozone website to try and find this little circular, self adhesive gasket. after some time i found the part name called a camshaft position sensor. so i ordered the 3.99 gasket, took the new crankshaft position sensor out and applied the little gasket to the tip of the sensor. the gasket is about 1/32 thick, i started it from sitting in my garage for about 2 days and no sputter after 10 miinutes...unbelievable...

so after about 200 dollars worth of new sensors on my heap it was a 3.99 fix. atleast my 201k teenager has all new sensors....

thanks for all the help fellas i really do appreciate it.

ill update in about a week or so, its hard to believe that was the problem all along...jeeeez.
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Unread 11-14-2013, 09:24 AM   #21
laybackman
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Quote:
Originally Posted by Schmuds View Post
so i stopped to think the other day of when i started having the problems. and it all started when i changed the crankshaft position sensor becuase it was not starting. so i started reading more on the forum and found a couple of threads that stated there is supposed to be a circular paper gasket on the tip of the crankshaft position sensor, and could not remember if i put one on it. i didnt remember this little part being included with the sensor i bought. so i started looking at the autozone website to try and find this little circular, self adhesive gasket. after some time i found the part name called a camshaft position sensor. so i ordered the 3.99 gasket, took the new crankshaft position sensor out and applied the little gasket to the tip of the sensor. the gasket is about 1/32 thick, i started it from sitting in my garage for about 2 days and no sputter after 10 miinutes...unbelievable...

so after about 200 dollars worth of new sensors on my heap it was a 3.99 fix. atleast my 201k teenager has all new sensors....

thanks for all the help fellas i really do appreciate it.

ill update in about a week or so, its hard to believe that was the problem all along...jeeeez.
That 'gasket' is a spacer that automatically 'gaps' the CRANK (not O2) sensor when it is being installed. When you fire up the engine it gets knocked off.


After all our input though......you fixed it all by yourself!!
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Senators and Congressman should wear uniforms like NASCAR drivers so we could identify their corporate sponsors....

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Last edited by laybackman; 11-14-2013 at 02:27 PM.. Reason: my brain is freakin' fried crank sensor NOT O2...duh
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Unread 11-14-2013, 11:03 AM   #22
vadslram
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His problem was the CP sensor not the O2.
I'm not sure what the effect was but it must have been like the old "dwell" where since the CP was closer to sender it registered the pulse earlier.
but 1/32"...I'm glad I de-modernized mine.
I had an old Tradesman van that ran for almost half a year with three of the plug wires switched. Ran like hell but it did run.
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Unread 11-14-2013, 02:25 PM   #23
laybackman
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Quote:
Originally Posted by vadslram View Post
His problem was the CP sensor not the O2.
I'm not sure what the effect was but it must have been like the old "dwell" where since the CP was closer to sender it registered the pulse earlier.
but 1/32"...I'm glad I de-modernized mine.
I had an old Tradesman van that ran for almost half a year with three of the plug wires switched. Ran like hell but it did run.
Good catch...I gotta start drinking again....
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Unread 11-14-2013, 02:47 PM   #24
Que89YJ
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That tab doesn't do anything. Unless the sensor was loose the spacer gets ripped off as soon as you start it. The distance the sensor detects the flywheel is not that tight of a tolerance. Besides the 10 minute description really doesn't match the fault. Keep the thread updated if it changes. I can't see the relationship and would like to know if you have fixed it by doing it.
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Unread 11-14-2013, 05:33 PM   #25
Luuca
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I noticed he never unplugged the negative battery cable (or did he?) to reset the ECM and the sensors after reinstalling. Perhaps it had enough run time to adjust itself?
Unclear.
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Unread 11-17-2013, 09:23 PM   #26
Schmuds
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yes i unplugged the negative terminal after installing the new sensors to reset the computer. its hard for me to believe that the fix was that little circular paper thing but that is the only thing i have done to it and now it runs like a champ. ill keep this updated.
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Unread 11-18-2013, 06:08 AM   #27
vadslram
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Could be a happy accident. You may have just had a bad connection somewhere and when you messed around to replace the gasket you made the connection.
Don't question the Jeep gods, they are capricious and can turn on you at the worst moment.
Just sacrifice a toyota part and pray they are appeased.
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