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05-26-2012, 06:39 PM
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Member
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Join Date: Aug 06, 2007
Location: Arizona
Posts: 47
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Trans removal caused high idle
Well happy Memorial Day weekend everybody ! I will be wrenching on the J10 - trying to get it running again. So here's the deal. Trans ( TH400 ) removed and reinstalled. Everything good. As soon as I start it the engine goes into high rev - higher than just choke mode. Like kick down mode. I figure its got to be something related to the trans removal. All vacuum hoses appear to be connected. There is an sensor of some sort on the drivers side which was disconnected but when I reconnected it still no difference. Any thoughts ?
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05-26-2012, 06:54 PM
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Master Mechanic
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Join Date: Sep 10, 2001
Location: Southern Illinois
Posts: 1,458
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Check the vacuum line to the vacuum modulator on the transmission. It's either got a hole in it, or the modulator itself is bad.
Be sure to keep an eye on the trans fluid as well.
__________________
83 J-10 Jeep "Oscar"
727 & 229 are rebuilt, but the 360 is in an incalculable number of pieces, sporadically disseminated all over the garage...
4" Rusty's with 33X12.50 Pro Comp MT's
I'll apologize ahead of time...my inner voice has Tourette's...
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05-27-2012, 07:36 AM
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FSJ Maniac
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Join Date: Nov 20, 2008
Location: Wilds of Ellington, CT
Posts: 3,814
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Quote:
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Originally Posted by billyj7175
Check the vacuum line to the vacuum modulator on the transmission. It's either got a hole in it, or the modulator itself is bad.
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X2. A vacuum leak there (or anyway) will cause a high idle.
__________________
Jeepasaurus (Wagonus Grandi quadropedus)
88 GW 360-.030 over/2150/727/229/Posi, e-pump, AC (broke), tow package, Monroe Air Shocks, dizzy manifold vacuum, CTO-Free, AIR-free, oil & tranny coolers, dried knuckle blood all over, GM 350 TBI in a box, waiting...
"You're an FSJ'r when the parts guys memorize your name, phone & credit card#."
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05-27-2012, 09:12 AM
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Member
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Join Date: Aug 06, 2007
Location: Arizona
Posts: 47
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Thanks guys - I'll check it all out.  |
05-27-2012, 09:16 AM
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Moderator
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Join Date: Dec 09, 2003
Location: Quakertown, PA
Posts: 2,236
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You also have vacuum lines running to the Quadratrac transfer case. Could have knocked them loose, or broken a hard line, etc.
__________________
Pete
'55 Willys Wagon, the original FSJ 
Sitting on a '77 Cherokee frame, Dodge D60's
Isuzu 6BD1, NV4500, NP241
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05-27-2012, 09:23 AM
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Dragin Az
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Join Date: Oct 17, 2003
Location: Chino Valley, Arizona
Posts: 7,948
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Quote:
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Originally Posted by JeepinPete
You also have vacuum lines running to the Quadratrac transfer case. Could have knocked them loose, or broken a hard line, etc.
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We had just swapped the QT for a Dana 20.
Paul, I might have forgotten to plug them off. I'll be over in a few and we'll get it right. |
05-27-2012, 10:43 AM
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Member
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Join Date: Aug 06, 2007
Location: Arizona
Posts: 47
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Who's that knocking on my door ? No problem Jeff - I know it's something simple. Just can't wait to see how it drives w/ the Dana 20 and an offset drive shaft. |
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