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Unread 05-11-2013, 07:31 PM   #1
shouser45
Registered User
2009 JK Wrangler 
 
Join Date: Apr 2011
Location: jim thorpe, pa
Posts: 122
need help

1999 jeep Cherokee 2dr 154xxx on clock

replaced
plugs
wires
cap
rotor
coil
fuel line
fuel rail
fuel injectors
tps
iac
purge valve
ldp
charcoal canister

when driving as long as im on the gas the jeep is fine but as soon as I let off the gas the idle jumps from 800 to 1200 its a steady jump even when I come to a stop the jeep will idle fine this is only while driving im about to burn this f'r to the ground I do have a new cps I didn't get to install yet

plz help ive searched

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Unread 05-11-2013, 09:12 PM   #2
shouser45
Registered User
2009 JK Wrangler 
 
Join Date: Apr 2011
Location: jim thorpe, pa
Posts: 122
Quote:
Originally Posted by shouser45
1999 jeep Cherokee 2dr 154xxx on clock

replaced
plugs
wires
cap
rotor
coil
fuel line
fuel rail
fuel injectors
tps
iac
purge valve
ldp
charcoal canister

when driving as long as im on the gas the jeep is fine but as soon as I let off the gas the idle jumps from 800 to 1200 its a steady jump even when I come to a stop the jeep will idle fine this is only while driving im about to burn this f'r to the ground I do have a new cps I didn't get to install yet

plz help ive searched
Bumppppp
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Unread 05-12-2013, 11:01 AM   #3
shouser45
Registered User
2009 JK Wrangler 
 
Join Date: Apr 2011
Location: jim thorpe, pa
Posts: 122
Quote:
Originally Posted by shouser45

Bumppppp
Really?
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Unread 05-12-2013, 11:09 AM   #4
sluff28
Registered User
2001 XJ Cherokee 
 
Join Date: Sep 2011
Location: Beech Bluff, Tn
Posts: 156
O2 sensors can cause this jumping idle. Not sure if this would be the issue due to good idle standing still
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Unread 05-12-2013, 11:10 AM   #5
buildin1XJ
Web Wheeler
1999 XJ Cherokee 
 
Join Date: Oct 2011
Location: Knoxville, Tn.
Posts: 1,580
Any Codes? Where have you been buying your sensors from? Cheap lifetime warranty sensors bought from places like advance are very well known to fail right out of the box, which ends up causing you to think all is good. Sounds like you've been throwing parts at it instead of testing.
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Unread 05-12-2013, 11:20 AM   #6
tnc22
Registered User
1986 XJ Cherokee 
 
Join Date: Oct 2010
Location: palmerston, on., Ontario, Canada
Posts: 10
Speaking of testing: vacuum leak somewhere on your intake matches your symptons bang on.
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Unread 05-12-2013, 11:21 AM   #7
shouser45
Registered User
2009 JK Wrangler 
 
Join Date: Apr 2011
Location: jim thorpe, pa
Posts: 122
Quote:
Originally Posted by buildin1XJ
Any Codes? Where have you been buying your sensors from? Cheap lifetime warranty sensors bought from places like advance are very well known to fail right out of the box, which ends up causing you to think all is good. Sounds like you've been throwing parts at it instead of testing.
All parts thrown at it needed to b replaced prolly could have held off on purge valve an charcoal canister all vac lines r good to it was all part of the turn up just don't know why I have n idle issue
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Unread 05-12-2013, 11:35 AM   #8
tnc22
Registered User
1986 XJ Cherokee 
 
Join Date: Oct 2010
Location: palmerston, on., Ontario, Canada
Posts: 10
Ah, but testing! Did you go looking for leaks on your intake i.e. Around the gaskets with a spray or stethescope? Did you check all the individual components that have a vacuum line routed to them?
The basic idea is if there is air getting in somewhere, the engine will act just like having your foot lightly on the throttle. Speaking of which, check that nothing is interfering with your throttle plate or cable or gas pedal. Had my floor mats catch me like that once, holding the gas pedal slightly applied.
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Unread 05-13-2013, 07:13 AM   #9
shouser45
Registered User
2009 JK Wrangler 
 
Join Date: Apr 2011
Location: jim thorpe, pa
Posts: 122
Quote:
Originally Posted by tnc22
Ah, but testing! Did you go looking for leaks on your intake i.e. Around the gaskets with a spray or stethescope? Did you check all the individual components that have a vacuum line routed to them?
The basic idea is if there is air getting in somewhere, the engine will act just like having your foot lightly on the throttle. Speaking of which, check that nothing is interfering with your throttle plate or cable or gas pedal. Had my floor mats catch me like that once, holding the gas pedal slightly applied.
Pulled code p1494 where so I start with this?? I have checked everything what am I missing??
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