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08-06-2007, 08:11 PM
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#1 | |
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AF Newbie
Join Date: May 2005
Location: kennesaw, Georgia
Posts: 21
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99 rodeo "jumping" tachometer
I have a 99 rodeo 4x2, auto trans, 98k miles. Occasionally when in P or N, the engine revs up from 1000k rpm to 2k over and over again. it normally idles at 1k. when in gear it seems fine. Any ideas as to what's going on?
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08-06-2007, 09:40 PM
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#2 | |
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Isuzu Guy
 Join Date: Jan 2004
Location: Madison, Wisconsin
Posts: 3,386
Thanks: 2
Thanked 29 Times in 23 Posts
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Re: 99 rodeo "jumping" tachometer
most likely a faulting intake manifold gasket. see the faq's
__________________
-Ryan Isuzu Moderator Car Show Tips Operations manager with a results-driven passion for process improvement FAQ 98-04 Isuzu Rodeo, Rodeo Sport, Amigo, Trooper SOLD - NOV2015 - 2000 Amigo, V6, HT winter, ST summer, 2wd |
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08-06-2007, 11:56 PM
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#3 | |
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AF Enthusiast
 
Join Date: Sep 2005
Location: Aurora, Colorado
Posts: 1,134
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Re: 99 rodeo "jumping" tachometer
There was something else known to cause jumping idle as well but for the life of me I cant remember what it was. Idle air control maybe?
__________________
--Dave 1999 Rodeo LS 3.2 4x4 5 Speed 32x11.50-15 BFG T/A KO 3" Lift - Rancho 9000x Rear No-Slip Locker Flowmaster 2.25" 50 Series There is a very fine line between "hobby" and "mental illness." - Dave Barry |
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