need idle help
#1
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Join Date: Dec 2010
Location: shawnee,ks
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Year: 1993
Model: Cherokee
Engine: 4.0
need idle help
It has a rough idle whenever its not fully warmed up and seems to be slightly worse in reverse, it is a 93 4.0 and I just replaced the downpipe o2 sensor
Any help is greatly appreciated
Any help is greatly appreciated
#2
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Join Date: May 2010
Location: MI 48642
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Year: 1996
Model: Cherokee
Engine: 4.0
Check your IAC, make sure it isn't really dirty, same with the throttle body. Check all your vacuum lines, make sure they aren't cracked or broken. A search on the forum will offer dozens of other potential problems also.
#5
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Year: 1989 Laredo
Model: Cherokee
Engine: 4.0 L 6 Renix
Idle Air Control motor, wire plug and 2 torx head screws hold it onto the throttle body. It has an oring and a cone shaped plunger. Controls the air at idle. When it is fouled or failed it will cause rough idle, or even very erratic idle rpm changes. You can unbolt it, spray it with carb cleaner and scrub it gently with your best friends tooth brush. Gently, don't get rammy with the cone. New here is about $60 at Napa.
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