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Unread 09-22-2013, 06:30 AM   #16
BH97TJ
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1977 CJ7 
 
Join Date: May 2007
Location: Oley, Pennsylvania
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Im not too thrilled about the new engine sitting at 4k rpm for an extended period of time with no movement. Ill try unplugging the IAC, but i dont have a scan tool here

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Unread 09-22-2013, 06:35 AM   #17
BH97TJ
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Moparmech, ill give that a shot too. Thanks for that tip! Hopefully i can find something after work today, but itll be my last attempt. I made plans with my buddy to pick it up with his trailer and take it to my mechanic for me. Im at wits end at this point and i already saved a ton of money in labor by doing the engine/trans replacement myself.

Thanks again everyone! I really do appreciate the help.
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Unread 09-22-2013, 01:13 PM   #18
86cj74.2L
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2004 WJ 
 
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Location: Stouchsburg, PA
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What if you fired it up and slid a plate or piece of wood or something over the TB to block off the air completely. If it still high revs then its a vacuum leak. If it stalls its a sensor or PCM or relearn.
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Unread 09-25-2013, 05:51 PM   #19
BH97TJ
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Turns out I'm an idiot. My mechanic fixed the issue and said the manifold was sitting away from the engine on the bottom toward the firewall, obviously sucking in way more air than it should.

But now the used trans I installed has some pretty major issues. So ... back out to the garage to throw my old trans back in.

It never ends!
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Unread 09-25-2013, 06:09 PM   #20
new2site
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Quote:
Originally Posted by BH97TJ View Post
My mechanic fixed the issue and said the manifold was sitting away from the engine on the bottom toward the firewall, obviously sucking in way more air than it should.
How could that be? Is it because you were using your old intake and it was slightly warped...remedied with high-temp sealant?

On the tranny re-swap...if this was a used engine you put in and you didn't already ...may as well replace any freeze plugs on the back of the block while you have them apart...cheap and easy.
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Unread 09-25-2013, 06:29 PM   #21
BH97TJ
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The intake wasnt sitting all the way against the head in the rear where the dowel is. The front was seated correctly, but the rear wasnt. The intake isnt warped.

Im keeping the engine in this time, obviously, but i appreciate the input on the freeze plugs.
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Unread 09-25-2013, 07:20 PM   #22
new2site
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Quote:
Originally Posted by BH97TJ View Post
Im keeping the engine in this time, obviously, but i appreciate the input on the freeze plugs.
I was implying when you pull this tranny out you'll have the back of the block exposed to easily get at those rear plug(s).
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Unread 09-28-2013, 05:13 AM   #23
86cj74.2L
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Unless the trans comes out of a wrecked vehicle I don't trust it. I see too many perfect looking vehicles with paint pen on the roof saying bad trans when I go junking.
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Unread 10-27-2013, 05:55 PM   #24
srwells37
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Did you ever figure out the high idle problem ? I just replaced my engine and its doing the same thing.. Thanks
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Unread 10-27-2013, 06:23 PM   #25
BH97TJ
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Yep, it was in fact the intake manifold sitting away from the cylinder head. Make sure your manifold is fully seated in the right position on the dowel pins and torque the bolts and nuts to spec. Its a pain in the *** to get in there to check if its seated right, but a small flashlight and a mirror are your friends!

Good luck!
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Unread 10-28-2013, 05:13 AM   #26
srwells37
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Thanks for the info. Guess ill be looking at that this week
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Unread 10-28-2013, 12:45 PM   #27
skypilot123
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Sounds like a massive vacuum leak, as suggested.
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Unread 11-01-2013, 06:15 PM   #28
srwells37
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my problem is fixed. it was i fact the intake manifold wasnt seated right. Thanks for the info
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