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Unread 08-11-2009, 02:01 PM   #1
emahan01
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1999 TJ Wrangler 
 
Join Date: Sep 2008
Location: Parsippany
Posts: 328
hiss noise from engine and doesnt wana down shift

i jus changed the exaust manifold and it seemed to have fixed the diesel sound but after i got it all back together i drove it and it doesnt seem to want to down shift when i get on it and there is a hissing sound i cant seem to find. i can literaly smash the gas to the floor and it wont down shift and the rps jus slowly go up.

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Unread 08-11-2009, 03:17 PM   #2
Luke94XJ
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1994 XJ Cherokee 
 
Join Date: Apr 2008
Location: Columbia, Mo.
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sounds like a vacuum leak, I didn't know they had a vacuum kickdown, maybe they don't. Most likely that's the problem do you have a chiltons with a vacuum diagram or a underhood diagram on the fan shroud? you should check that see if there's anything going down to your trans. on the diagram.
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Unread 08-11-2009, 11:54 PM   #3
emahan01
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1999 TJ Wrangler 
 
Join Date: Sep 2008
Location: Parsippany
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bump anyone else have a suggestion from what i can see i put all the lines back together where they were
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Unread 08-12-2009, 07:05 AM   #4
emahan01
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1999 TJ Wrangler 
 
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when i start the jeep it idles higher then before also im guessing i got a vacuum leak somewhere i dont know where it cld be though
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Unread 08-12-2009, 07:32 AM   #5
ZachAttack923
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1997 TJ Wrangler 
 
Join Date: Nov 2008
Location: Parsippany, New Jersey
Posts: 231
when we moved the intake i think we pinched a vaccum line and now its leaking cause remember the lines that we dident take off i think that one of those got pinched
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1997 Jeep Wrangler 2.5L AX-5 D30/35 4.10 gears
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