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Unread 08-30-2011, 07:28 AM   #16
Sawicki4wd
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1989 YJ Wrangler 
 
Join Date: Jul 2011
Location: Chicopee, Mass
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Disconnect postive touch it to negative turn key to run turn lights on then off right

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Unread 08-30-2011, 09:28 AM   #17
oldtime_ironman
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1991 YJ Wrangler 
 
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Location: 14304 Niagara Falls, NY
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Quote:
Originally Posted by Sawicki4wd View Post
Disconnect postive touch it to negative turn key to run turn lights on then off right
Don't even have to do all that. I just disconnect the positive and touch it to the negative and let it sit a few minutes while I do other things. Hook it back up, and all done!
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Unread 08-30-2011, 09:43 AM   #18
bharris68
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1989 YJ Wrangler 
 
Join Date: Jun 2006
Location: Issaquah, Washington
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Have you checked the fuel return line as was suggested earlier? If you replaced your tank check to make sure it's not pinched off which would prevent fuel return.

Also - put a fuel pressure gauge on it and assure you're in the correct range
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Unread 08-30-2011, 12:25 PM   #19
Sawicki4wd
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What line is the return line. I'm guessing one of the smaller lines
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Unread 08-30-2011, 12:47 PM   #20
Sawicki4wd
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What line is the return line. I'm guessing one of the smaller lines
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Unread 08-30-2011, 08:29 PM   #21
Sawicki4wd
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1989 YJ Wrangler 
 
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Well apparently I still had an exhaust leak so I fixed that and it quieted down a lot. I'm not sure if it helped running rich yet but I'll let you know
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Unread 08-31-2011, 09:44 PM   #22
Sawicki4wd
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1989 YJ Wrangler 
 
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Well no changes. Im still running super rich. I went from getting 190 miles to a tank to about 105 miles a tank. It's not the o2 sensor. And I changed and gaped the plugs. Could it be timing. Its weird because it happened when I Swaped my tranny.
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Unread 09-01-2011, 05:08 AM   #23
Que89YJ
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1989 YJ Wrangler 
 
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Location: Detroit, Michigan
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Did you reset the battery? Also, you have an EGR that can act like a leak. They are a Pita on ours. At least temporarily try flanging off the EGR or replacing it. I am sure that its a leak causing it to lean out if the O2 is making it run rich.
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Unread 09-01-2011, 07:57 AM   #24
Sawicki4wd
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1989 YJ Wrangler 
 
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I did reset the ecu and Blocked off the egr. Im wondering of it could be an vacuum leak. Does anyone have a vacuum diagram for it
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Unread 09-01-2011, 08:07 AM   #25
bharris68
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1989 YJ Wrangler 
 
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While not a professional mechanic - it looks like you're thrashing about hoping that any activity or change may "be right" and will stop the problem.

In one of your original posts you noted that you replaced the rotted gas tank - start with the fuel lines, fuel pump, etc. and check them with a pressure gague and check to be sure your return line is not blocked.

If you've blocked off the EGR and made other changes, then you're probably fighting a multiple front war and isolating the problem will only become increasingly difficult until and unless you eliminate one variable at a time - not introduce more Slow down and do one thing at a time. We're here to help - just try to slow down a bit!
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Unread 09-01-2011, 08:48 AM   #26
Que89YJ
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I went back through the post. Did you figure out where the 3 tubed vacuum lines went to?
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Unread 09-01-2011, 10:17 AM   #27
notmyj
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1992 YJ Wrangler 
 
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Check the coolant temp sensor (the one with two wires going to it). Check it with an ohm meter to read the resistance. I had a similar problem turns out the CTS was causing it. You see, when the engine is running in open loop, it is not paying attention to what the o2 sensor is doing. The only time the o2 sensor will have any effect on the fuel trim is during closed loop. In order for the jeep to go into closed loop, the ecm needs to see coolant temp come up to operating temp, o2 sensor light off (the point that the o2 sensor gets hot enough to make voltage), etc. Until all the requirements are met the computer will run a preset fuel trim based on throttle position, coolant temp, and manifold absolute pressure.

Heres where a faulty CTS comes in. When the CTS fails, it reads really high resistance. This is interpreted by ecm as cold. Really cold. When mine went bad it was telling the computer it was -70*. When its cold, the engine needs more fuel to run. So the ecm starts dumping fuel trying to keep what it thinks is a freezing engine running. Furthermore, since the CTS always reports that its cold, and the ecm never sees operating temp, it will never go into closed loop and read the o2 sensor.

Before you go replacing it, check it with a multimeter. Check the pins in the conecter to make sure there is no corrosion. Use the table below to check the resistance for the temp.

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Unread 09-01-2011, 07:59 PM   #28
Sawicki4wd
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The cts is where. I can't figure what sensor it is
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Unread 09-01-2011, 09:25 PM   #29
Que89YJ
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Its in the front by the thermostat housing.
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Unread 09-01-2011, 10:03 PM   #30
Sawicki4wd
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Okay and yeah it went behind the engine head. Never expected it to go there
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