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Unread 08-06-2014, 09:20 PM   #16
rm2001wj
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If it starts only when the throttle is open, then it's not getting enough air when the throttle is closed. Most likely the PCM needs to relearn the proper setting of the IAC valve. Start it, with the throttle open, then vary the engine speed while feathering the throttle so that the engine does not stop. This works best if you just drive it around the neighborhood for a while.

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Unread 08-06-2014, 09:28 PM   #17
jspidle
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SuperDragPack what trick did you use to change out a Crank Pos Sensor on a 4.7 in 5 minutes? That d*mn thing has to be in the worst place possible to reach to me.

Thanks, Jeff
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Unread 08-06-2014, 10:07 PM   #18
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SuperDragPack what trick did you use to change out a Crank Pos Sensor on a 4.7 in 5 minutes? That d*mn thing has to be in the worst place possible to reach to me.

Thanks, Jeff
Pull the starter.
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Unread 08-07-2014, 05:50 AM   #19
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Quote:
Originally Posted by jspidle View Post
SuperDragPack what trick did you use to change out a Crank Pos Sensor on a 4.7 in 5 minutes? That d*mn thing has to be in the worst place possible to reach to me.

Thanks, Jeff
Exactly what has been said.

Disconnect the battery FIRST. Then two 15mm bolts hold on the starter. Then move it away slightly.

Once that is out of the way the bolt holding the sensor is right there in front of you. Undo it and work (gently) the sensor out. Don't pry it too much, but use gentle twisting motions.

Every CPS I have done so far on these V8's have come out without a fuss, but I hear of some having a right pain getting that sensor out. Depends on many factors sadly.
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Unread 08-09-2014, 12:57 PM   #20
transguy1
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Quote:
Originally Posted by rm2001wj View Post
If it starts only when the throttle is open, then it's not getting enough air when the throttle is closed. Most likely the PCM needs to relearn the proper setting of the IAC valve. Start it, with the throttle open, then vary the engine speed while feathering the throttle so that the engine does not stop. This works best if you just drive it around the neighborhood for a while.
it will stall out eventually so its hard to kerp driving! fml
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Unread 08-14-2014, 01:20 PM   #21
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back again I had the day off today so I decided to do some more work on the jeep.. let it run for a lil to see if it will stay idling . come to find out there is coolant and oil mixed running out the intake manifold and into the throttle body?? bad headgasket? cracked head? where do u guys think I should go from here .. (just replaced the head gasket on both side) errrrrr! help
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Unread 08-14-2014, 01:29 PM   #22
srwells37
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Did you torque the head bolts right ?
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Unread 08-14-2014, 02:25 PM   #23
transguy1
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Did you torque the head bolts right ?
yes exactly how dealer said I don't know why im getting coolant and oil out of the manifold?? I pulled it off to look for signs of cracking but I don't see anything ..
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Unread 08-14-2014, 02:32 PM   #24
srwells37
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Head could be warped
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Unread 08-14-2014, 03:05 PM   #25
transguy1
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Head could be warped
and that would cause to leak out of intake mani?
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Unread 08-14-2014, 03:39 PM   #26
srwells37
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If its warped in the right spot it could..
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Unread 08-14-2014, 03:44 PM   #27
srwells37
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also double check your intake manifold gaskets..Make sure they are good
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Unread 08-15-2014, 10:47 AM   #28
transguy1
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so I pulled the head off and can see where the oil coolant built up is but cannot identify and noticeable marks on the gasket, block, head etc.. anything I should look for before I take the head to a shop .. im real broke and want to identify the problem as much as I can without a machine shop! intake mani gaskets are good no tears or anything..
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Unread 08-15-2014, 03:08 PM   #29
akoutdoors1
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How is oil running into the throttle body? There's only air and fuel up there. And for that matter, there's no lubrication at the intake manifold. What is the evidence that coolant and oil are leaking? What does your crank case oil look like (on the dipstick)?
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Unread 08-15-2014, 03:10 PM   #30
akoutdoors1
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As for testing the heads, that's machine shop territory. DO NOT put heads back on until you have them pressure tested/magnafluxed/dye checked.
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